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<div class="title">multiway_merge.h</div> </div>
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<a href="a01319.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// -*- C++ -*-</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> </div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">//</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// software; you can redistribute it and/or modify it under the terms</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// of the GNU General Public License as published by the Free Software</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Foundation; either version 3, or (at your option) any later</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// version.</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// This library is distributed in the hope that it will be useful, but</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// General Public License for more details.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// 3.1, as published by the Free Software Foundation.</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">// You should have received a copy of the GNU General Public License and</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">// <http://www.gnu.org/licenses/>.</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"></span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/** @file parallel/multiway_merge.h</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">* @brief Implementation of sequential and parallel multiway merge.</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">*</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">* Explanations on the high-speed merging routines in the appendix of</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">*</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">* P. Sanders.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">* Fast priority queues for cached memory.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">* ACM Journal of Experimental Algorithmics, 5, 2000.</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">*</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">* This file is a GNU parallel extension to the Standard C++ Library.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// Written by Johannes Singler and Manuel Holtgrewe.</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#ifndef _GLIBCXX_PARALLEL_MULTIWAY_MERGE_H</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor"></span><span class="preprocessor">#define _GLIBCXX_PARALLEL_MULTIWAY_MERGE_H</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#include <<a class="code" href="a01580.html">vector</a>></span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#include <<a class="code" href="a01490.html">bits/stl_algo.h</a>></span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#include <<a class="code" href="a01172.html" title="Defines on whether to include algorithm variants.">parallel/features.h</a>></span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#include <<a class="code" href="a01349.html" title="End-user include file. Provides advanced settings and tuning options. This file is a GNU parallel ext...">parallel/parallel.h</a>></span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#include <<a class="code" href="a01295.html" title="Many generic loser tree variants. This file is a GNU parallel extension to the Standard C++ Library...">parallel/losertree.h</a>></span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include <<a class="code" href="a01316.html" title="Functions to find elements of a certain global __rank in multiple sorted sequences. Also serves for splitting such sequence sets.">parallel/multiseq_selection.h</a>></span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor"></span><span class="preprocessor">#include <<a class="code" href="a01033.html" title="Routines for checking the correctness of algorithm results. This file is a GNU parallel extension to ...">parallel/checkers.h</a>></span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor"></span><span class="comment"></span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment">/** @brief Length of a sequence described by a pair of iterators. */</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"><a class="code" href="a01319.html#a2693f6e2ecfb03bdb564ca578f60b085"> 54</a></span> <span class="preprocessor">#define _GLIBCXX_PARALLEL_LENGTH(__s) ((__s).second - (__s).first)</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="keyword">namespace </span>__gnu_parallel</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> {</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIter1, <span class="keyword">typename</span> _RAIter2, <span class="keyword">typename</span> _OutputIterator,</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keyword">typename</span> _DifferenceTp, <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  _OutputIterator</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <a class="code" href="a01597.html#a0059cd13cc6ab70692f8309ad92cb548" title="Merge routine being able to merge only the __max_length smallest elements.">__merge_advance</a>(_RAIter1&, _RAIter1, _RAIter2&, _RAIter2,</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  _OutputIterator, _DifferenceTp, _Compare);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment"></span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment"> /** @brief _Iterator wrapper supporting an implicit supremum at the end</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> * of the sequence, dominating all comparisons.</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> * The implicit supremum comes with a performance cost.</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment"> * Deriving from _RAIter is not possible since</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment"> * _RAIter need not be a class.</span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIter, <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00073"></a><span class="lineno"><a class="code" href="a00129.html"> 73</a></span>  <span class="keyword">class </span><a class="code" href="a00129.html" title="_Iterator wrapper supporting an implicit supremum at the end of the sequence, dominating all comparis...">_GuardedIterator</a></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  {</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keyword">private</span>:<span class="comment"></span></div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment"> /** @brief Current iterator __position. */</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  _RAIter _M_current;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment"></span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment"> /** @brief End iterator of the sequence. */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  _RAIter _M_end;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"></span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment"> /** @brief _Compare. */</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  _Compare& __comp;</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> /** @brief Constructor. Sets iterator to beginning of sequence.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="comment"> * @param __begin Begin iterator of sequence.</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> <span class="comment"> * @param __end End iterator of sequence.</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> * @param __comp Comparator provided for associated overloaded</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> * compare operators. */</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"><a class="code" href="a00129.html#ae5f70394d5c15f471216c6483d846b1c"> 91</a></span>  <a class="code" href="a00129.html#ae5f70394d5c15f471216c6483d846b1c" title="Constructor. Sets iterator to beginning of sequence.">_GuardedIterator</a>(_RAIter __begin, _RAIter __end, _Compare& __comp)</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  : _M_current(__begin), _M_end(__end), __comp(__comp)</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  { }</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment"></span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="comment"> /** @brief Pre-increment operator.</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"> * @return This. */</span></div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <a class="code" href="a00129.html" title="_Iterator wrapper supporting an implicit supremum at the end of the sequence, dominating all comparis...">_GuardedIterator<_RAIter, _Compare></a>&</div>
<div class="line"><a name="l00098"></a><span class="lineno"><a class="code" href="a00129.html#ab5ee82c060324ccc10d02831a5270a7c"> 98</a></span>  <a class="code" href="a00129.html#ab5ee82c060324ccc10d02831a5270a7c" title="Pre-increment operator.">operator++</a>()</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  {</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  ++_M_current;</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  }</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"></span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> /** @brief Dereference operator.</span></div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * @return Referenced element. */</span></div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">typename</span> std::iterator_traits<_RAIter>::value_type&</div>
<div class="line"><a name="l00107"></a><span class="lineno"><a class="code" href="a00129.html#a89e62967a92648f52f3da16144bf9b75"> 107</a></span>  <a class="code" href="a00129.html#a89e62967a92648f52f3da16144bf9b75" title="Dereference operator.">operator*</a>()</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  { <span class="keywordflow">return</span> *_M_current; }</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"></span></div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> /** @brief Convert to wrapped iterator.</span></div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="comment"> * @return Wrapped iterator. */</span></div>
<div class="line"><a name="l00112"></a><span class="lineno"><a class="code" href="a00129.html#aaa63e1e4c5f2ad032d7deac8dbd8d2d6"> 112</a></span>  <span class="keyword">operator</span> _RAIter()</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  { <span class="keywordflow">return</span> _M_current; }</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span> <span class="comment"></span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="comment"> /** @brief Compare two elements referenced by guarded iterators.</span></div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> <span class="comment"> * @param __bi1 First iterator.</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> <span class="comment"> * @param __bi2 Second iterator.</span></div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> <span class="comment"> * @return @c true if less. */</span></div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">friend</span> <span class="keywordtype">bool</span></div>
<div class="line"><a name="l00120"></a><span class="lineno"><a class="code" href="a00129.html#a2bf5c5fcb9aba7fef572a48701d84f9d"> 120</a></span>  operator<(_GuardedIterator<_RAIter, _Compare>& __bi1,</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <a class="code" href="a00129.html" title="_Iterator wrapper supporting an implicit supremum at the end of the sequence, dominating all comparis...">_GuardedIterator<_RAIter, _Compare></a>& __bi2)</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">if</span> (__bi1._M_current == __bi1._M_end) <span class="comment">// __bi1 is sup</span></div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">return</span> __bi2._M_current == __bi2._M_end; <span class="comment">// __bi2 is not sup</span></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (__bi2._M_current == __bi2._M_end) <span class="comment">// __bi2 is sup</span></div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">return</span> (__bi1.__comp)(*__bi1, *__bi2); <span class="comment">// normal compare</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span> <span class="comment"></span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> <span class="comment"> /** @brief Compare two elements referenced by guarded iterators.</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> <span class="comment"> * @param __bi1 First iterator.</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> * @param __bi2 Second iterator.</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> <span class="comment"> * @return @c True if less equal. */</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keyword">friend</span> <span class="keywordtype">bool</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"><a class="code" href="a00129.html#a406eb3652a303e46bd225a4046401bf4"> 135</a></span>  operator<=(_GuardedIterator<_RAIter, _Compare>& __bi1,</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <a class="code" href="a00129.html" title="_Iterator wrapper supporting an implicit supremum at the end of the sequence, dominating all comparis...">_GuardedIterator<_RAIter, _Compare></a>& __bi2)</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  {</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">if</span> (__bi2._M_current == __bi2._M_end) <span class="comment">// __bi1 is sup</span></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">return</span> __bi1._M_current != __bi1._M_end; <span class="comment">// __bi2 is not sup</span></div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordflow">if</span> (__bi1._M_current == __bi1._M_end) <span class="comment">// __bi2 is sup</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">return</span> !(__bi1.__comp)(*__bi2, *__bi1); <span class="comment">// normal compare</span></div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  } </div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  };</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIter, <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keyword">class </span>_UnguardedIterator</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  {</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keyword">private</span>:<span class="comment"></span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="comment"> /** @brief Current iterator __position. */</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  _RAIter _M_current;<span class="comment"></span></div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> /** @brief _Compare. */</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  _Compare& __comp;</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keyword">public</span>:<span class="comment"></span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="comment"> /** @brief Constructor. Sets iterator to beginning of sequence.</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="comment"> * @param __begin Begin iterator of sequence.</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> <span class="comment"> * @param __end Unused, only for compatibility.</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> <span class="comment"> * @param __comp Unused, only for compatibility. */</span></div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  _UnguardedIterator(_RAIter __begin,</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  _RAIter <span class="comment">/* __end */</span>, _Compare& __comp)</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  : _M_current(__begin), __comp(__comp)</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  { }</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"></span></div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> <span class="comment"> /** @brief Pre-increment operator.</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span> <span class="comment"> * @return This. */</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  _UnguardedIterator<_RAIter, _Compare>&</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  operator++()</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  {</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  ++_M_current;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  }</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> <span class="comment"></span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> <span class="comment"> /** @brief Dereference operator.</span></div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span> <span class="comment"> * @return Referenced element. */</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="keyword">typename</span> std::iterator_traits<_RAIter>::value_type&</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  operator*()</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  { <span class="keywordflow">return</span> *_M_current; }</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="comment"></span></div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span> <span class="comment"> /** @brief Convert to wrapped iterator.</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> <span class="comment"> * @return Wrapped iterator. */</span></div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keyword">operator</span> _RAIter()</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  { <span class="keywordflow">return</span> _M_current; }</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="comment"></span></div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> <span class="comment"> /** @brief Compare two elements referenced by unguarded iterators.</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span> <span class="comment"> * @param __bi1 First iterator.</span></div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span> <span class="comment"> * @param __bi2 Second iterator.</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> * @return @c true if less. */</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keyword">friend</span> <span class="keywordtype">bool</span></div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  operator<(_UnguardedIterator<_RAIter, _Compare>& __bi1,</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  _UnguardedIterator<_RAIter, _Compare>& __bi2)</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  {</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="comment">// Normal compare.</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="keywordflow">return</span> (__bi1.__comp)(*__bi1, *__bi2);</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  }</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> <span class="comment"></span></div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="comment"> /** @brief Compare two elements referenced by unguarded iterators.</span></div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> <span class="comment"> * @param __bi1 First iterator.</span></div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span> <span class="comment"> * @param __bi2 Second iterator.</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span> <span class="comment"> * @return @c True if less equal. */</span></div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keyword">friend</span> <span class="keywordtype">bool</span></div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  operator<=(_UnguardedIterator<_RAIter, _Compare>& __bi1,</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  _UnguardedIterator<_RAIter, _Compare>& __bi2)</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  {</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  <span class="comment">// Normal compare.</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">return</span> !(__bi1.__comp)(*__bi2, *__bi1);</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  }</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  };</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span> <span class="comment"></span></div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> <span class="comment"> /** @brief Highly efficient 3-way merging procedure.</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span> <span class="comment"> * Merging is done with the algorithm implementation described by Peter</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="comment"> * Sanders. Basically, the idea is to minimize the number of necessary</span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment"> * comparison after merging an element. The implementation trick</span></div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> <span class="comment"> * that makes this fast is that the order of the sequences is stored</span></div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span> <span class="comment"> * in the instruction pointer (translated into labels in C++).</span></div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span> <span class="comment"> * This works well for merging up to 4 sequences.</span></div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span> <span class="comment"> * Note that making the merging stable does @a not come at a</span></div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span> <span class="comment"> * performance hit.</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span> <span class="comment"> * Whether the merging is done guarded or unguarded is selected by the</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span> <span class="comment"> * used iterator class.</span></div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> * @param __seqs_begin Begin iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> * @param __seqs_end End iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span> <span class="comment"> * @param __target Begin iterator of output sequence.</span></div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> * @param __comp Comparator.</span></div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span> <span class="comment"> * @param __length Maximum length to merge, less equal than the</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="comment"> * total number of elements available.</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment"> * @return End iterator of output sequence.</span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <span class="keyword">template</span><<span class="keyword">template</span><<span class="keyword">typename</span> RAI, <span class="keyword">typename</span> C> <span class="keyword">class </span>iterator,</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  _RAIter3</div>
<div class="line"><a name="l00241"></a><span class="lineno"><a class="code" href="a01597.html#a7ee9d79b73a6f85ae97e472312ba411e"> 241</a></span>  <a class="code" href="a01597.html#a7ee9d79b73a6f85ae97e472312ba411e" title="Highly efficient 3-way merging procedure.">multiway_merge_3_variant</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  {</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__length);</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span> </div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> </div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  ::value_type::first_type</div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  _RAIter1;</div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  _ValueType;</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> </div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  <span class="keywordflow">if</span> (__length == 0)</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> </div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="preprocessor"></span> _DifferenceTp __orig_length = __length;</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  iterator<_RAIter1, _Compare></div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  __seq0(__seqs_begin[0].first, __seqs_begin[0].second, __comp),</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  __seq1(__seqs_begin[1].first, __seqs_begin[1].second, __comp),</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  __seq2(__seqs_begin[2].first, __seqs_begin[2].second, __comp);</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> </div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keywordflow">if</span> (__seq0 <= __seq1)</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  {</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">if</span> (__seq1 <= __seq2)</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keywordflow">goto</span> __s012;</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">if</span> (__seq2 < __seq0)</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">goto</span> __s201;</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">goto</span> __s021;</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  }</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  {</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">if</span> (__seq1 <= __seq2)</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  {</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="keywordflow">if</span> (__seq0 <= __seq2)</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keywordflow">goto</span> __s102;</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">goto</span> __s120;</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  }</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <span class="keywordflow">goto</span> __s210;</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  }</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span> <span class="preprocessor">#define _GLIBCXX_PARALLEL_MERGE_3_CASE(__a, __b, __c, __c0, __c1) \</span></div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="preprocessor"> __s ## __a ## __b ## __c : \</span></div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span> <span class="preprocessor"> *__target = *__seq ## __a; \</span></div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="preprocessor"> ++__target; \</span></div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span> <span class="preprocessor"> --__length; \</span></div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span> <span class="preprocessor"> ++__seq ## __a; \</span></div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span> <span class="preprocessor"> if (__length == 0) goto __finish; \</span></div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> <span class="preprocessor"> if (__seq ## __a __c0 __seq ## __b) goto __s ## __a ## __b ## __c; \</span></div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="preprocessor"> if (__seq ## __a __c1 __seq ## __c) goto __s ## __b ## __a ## __c; \</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="preprocessor"> goto __s ## __b ## __c ## __a;</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  _GLIBCXX_PARALLEL_MERGE_3_CASE(0, 1, 2, <=, <=);</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  _GLIBCXX_PARALLEL_MERGE_3_CASE(1, 2, 0, <=, < );</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  _GLIBCXX_PARALLEL_MERGE_3_CASE(2, 0, 1, < , < );</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  _GLIBCXX_PARALLEL_MERGE_3_CASE(1, 0, 2, < , <=);</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  _GLIBCXX_PARALLEL_MERGE_3_CASE(0, 2, 1, <=, <=);</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  _GLIBCXX_PARALLEL_MERGE_3_CASE(2, 1, 0, < , < );</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span> </div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> <span class="preprocessor">#undef _GLIBCXX_PARALLEL_MERGE_3_CASE</span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  __finish:</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  ;</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span> </div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span> <span class="preprocessor"></span> _GLIBCXX_PARALLEL_ASSERT(</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  ((_RAIter1)__seq0 - __seqs_begin[0].first) +</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  ((_RAIter1)__seq1 - __seqs_begin[1].first) +</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  ((_RAIter1)__seq2 - __seqs_begin[2].first)</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  == __orig_length);</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  __seqs_begin[0].first = __seq0;</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  __seqs_begin[1].first = __seq1;</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  __seqs_begin[2].first = __seq2;</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span> </div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  }</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span> <span class="comment"></span></div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span> <span class="comment"> * @brief Highly efficient 4-way merging procedure.</span></div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="comment"> * Merging is done with the algorithm implementation described by Peter</span></div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="comment"> * Sanders. Basically, the idea is to minimize the number of necessary</span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span> <span class="comment"> * comparison after merging an element. The implementation trick</span></div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span> <span class="comment"> * that makes this fast is that the order of the sequences is stored</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span> <span class="comment"> * in the instruction pointer (translated into goto labels in C++).</span></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> <span class="comment"> * This works well for merging up to 4 sequences.</span></div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="comment"> * Note that making the merging stable does @a not come at a</span></div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span> <span class="comment"> * performance hit.</span></div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span> <span class="comment"> * Whether the merging is done guarded or unguarded is selected by the</span></div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span> <span class="comment"> * used iterator class.</span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span> <span class="comment"> * @param __seqs_begin Begin iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span> <span class="comment"> * @param __seqs_end End iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span> <span class="comment"> * @param __target Begin iterator of output sequence.</span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span> <span class="comment"> * @param __comp Comparator.</span></div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span> <span class="comment"> * @param __length Maximum length to merge, less equal than the</span></div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> <span class="comment"> * total number of elements available.</span></div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span> <span class="comment"> * @return End iterator of output sequence.</span></div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  <span class="keyword">template</span><<span class="keyword">template</span><<span class="keyword">typename</span> RAI, <span class="keyword">typename</span> C> <span class="keyword">class </span>iterator,</div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  _RAIter3</div>
<div class="line"><a name="l00360"></a><span class="lineno"><a class="code" href="a01597.html#ac4af8f9977aa36823357bce35be6c946"> 360</a></span>  <a class="code" href="a01597.html#ac4af8f9977aa36823357bce35be6c946" title="Highly efficient 4-way merging procedure.">multiway_merge_4_variant</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  {</div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__length);</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> </div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  ::value_type::first_type</div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  _RAIter1;</div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  _ValueType;</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span> </div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  iterator<_RAIter1, _Compare></div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  __seq0(__seqs_begin[0].first, __seqs_begin[0].second, __comp),</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  __seq1(__seqs_begin[1].first, __seqs_begin[1].second, __comp),</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  __seq2(__seqs_begin[2].first, __seqs_begin[2].second, __comp),</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  __seq3(__seqs_begin[3].first, __seqs_begin[3].second, __comp);</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> </div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span> <span class="preprocessor">#define _GLIBCXX_PARALLEL_DECISION(__a, __b, __c, __d) { \</span></div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span> <span class="preprocessor"> if (__seq ## __d < __seq ## __a) \</span></div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> <span class="preprocessor"> goto __s ## __d ## __a ## __b ## __c; \</span></div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span> <span class="preprocessor"> if (__seq ## __d < __seq ## __b) \</span></div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> <span class="preprocessor"> goto __s ## __a ## __d ## __b ## __c; \</span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span> <span class="preprocessor"> if (__seq ## __d < __seq ## __c) \</span></div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span> <span class="preprocessor"> goto __s ## __a ## __b ## __d ## __c; \</span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> <span class="preprocessor"> goto __s ## __a ## __b ## __c ## __d; }</span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="keywordflow">if</span> (__seq0 <= __seq1)</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  {</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <span class="keywordflow">if</span> (__seq1 <= __seq2)</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  _GLIBCXX_PARALLEL_DECISION(0,1,2,3)</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <span class="keywordflow">if</span> (__seq2 < __seq0)</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  _GLIBCXX_PARALLEL_DECISION(2,0,1,3)</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  _GLIBCXX_PARALLEL_DECISION(0,2,1,3)</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  }</div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  {</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <span class="keywordflow">if</span> (__seq1 <= __seq2)</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  {</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <span class="keywordflow">if</span> (__seq0 <= __seq2)</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  _GLIBCXX_PARALLEL_DECISION(1,0,2,3)</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  _GLIBCXX_PARALLEL_DECISION(1,2,0,3)</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  }</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  _GLIBCXX_PARALLEL_DECISION(2,1,0,3)</div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  }</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span> </div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span> <span class="preprocessor">#define _GLIBCXX_PARALLEL_MERGE_4_CASE(__a, __b, __c, __d, \</span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> <span class="preprocessor"> __c0, __c1, __c2) \</span></div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span> <span class="preprocessor"> __s ## __a ## __b ## __c ## __d: \</span></div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span> <span class="preprocessor"> if (__length == 0) goto __finish; \</span></div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span> <span class="preprocessor"> *__target = *__seq ## __a; \</span></div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span> <span class="preprocessor"> ++__target; \</span></div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span> <span class="preprocessor"> --__length; \</span></div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> <span class="preprocessor"> ++__seq ## __a; \</span></div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span> <span class="preprocessor"> if (__seq ## __a __c0 __seq ## __b) \</span></div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span> <span class="preprocessor"> goto __s ## __a ## __b ## __c ## __d; \</span></div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span> <span class="preprocessor"> if (__seq ## __a __c1 __seq ## __c) \</span></div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span> <span class="preprocessor"> goto __s ## __b ## __a ## __c ## __d; \</span></div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span> <span class="preprocessor"> if (__seq ## __a __c2 __seq ## __d) \</span></div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> <span class="preprocessor"> goto __s ## __b ## __c ## __a ## __d; \</span></div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span> <span class="preprocessor"> goto __s ## __b ## __c ## __d ## __a;</span></div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(0, 1, 2, 3, <=, <=, <=);</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(0, 1, 3, 2, <=, <=, <=);</div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(0, 2, 1, 3, <=, <=, <=);</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(0, 2, 3, 1, <=, <=, <=);</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(0, 3, 1, 2, <=, <=, <=);</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(0, 3, 2, 1, <=, <=, <=);</div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(1, 0, 2, 3, < , <=, <=);</div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(1, 0, 3, 2, < , <=, <=);</div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(1, 2, 0, 3, <=, < , <=);</div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(1, 2, 3, 0, <=, <=, < );</div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(1, 3, 0, 2, <=, < , <=);</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(1, 3, 2, 0, <=, <=, < );</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(2, 0, 1, 3, < , < , <=);</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(2, 0, 3, 1, < , <=, < );</div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(2, 1, 0, 3, < , < , <=);</div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(2, 1, 3, 0, < , <=, < );</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(2, 3, 0, 1, <=, < , < );</div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(2, 3, 1, 0, <=, < , < );</div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(3, 0, 1, 2, < , < , < );</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(3, 0, 2, 1, < , < , < );</div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(3, 1, 0, 2, < , < , < );</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(3, 1, 2, 0, < , < , < );</div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(3, 2, 0, 1, < , < , < );</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  _GLIBCXX_PARALLEL_MERGE_4_CASE(3, 2, 1, 0, < , < , < );</div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span> </div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span> <span class="preprocessor">#undef _GLIBCXX_PARALLEL_MERGE_4_CASE</span></div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> <span class="preprocessor"></span><span class="preprocessor">#undef _GLIBCXX_PARALLEL_DECISION</span></div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  __finish:</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  ;</div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span> </div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span>  __seqs_begin[0].first = __seq0;</div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  __seqs_begin[1].first = __seq1;</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  __seqs_begin[2].first = __seq2;</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  __seqs_begin[3].first = __seq3;</div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> </div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  }</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span> <span class="comment"></span></div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span> <span class="comment"> /** @brief Multi-way merging procedure for a high branching factor,</span></div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span> <span class="comment"> * guarded case.</span></div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span> <span class="comment"> * This merging variant uses a LoserTree class as selected by <tt>_LT</tt>.</span></div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span> <span class="comment"> * Stability is selected through the used LoserTree class <tt>_LT</tt>.</span></div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span> <span class="comment"> * At least one non-empty sequence is required.</span></div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span> <span class="comment"> * @param __seqs_begin Begin iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span> <span class="comment"> * @param __seqs_end End iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span> <span class="comment"> * @param __target Begin iterator of output sequence.</span></div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span> <span class="comment"> * @param __comp Comparator.</span></div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span> <span class="comment"> * @param __length Maximum length to merge, less equal than the</span></div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span> <span class="comment"> * total number of elements available.</span></div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span> <span class="comment"> * @return End iterator of output sequence.</span></div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _LT,</div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  _RAIter3</div>
<div class="line"><a name="l00491"></a><span class="lineno"><a class="code" href="a01597.html#a150b06a4da2cf1cff673d1b6242c27fa"> 491</a></span>  <a class="code" href="a01597.html#a150b06a4da2cf1cff673d1b6242c27fa" title="Multi-way merging procedure for a high branching factor, guarded case.">multiway_merge_loser_tree</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  {</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__length)</div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span> </div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  ::difference_type _SeqNumber;</div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  ::value_type::first_type</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  _RAIter1;</div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  _ValueType;</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span> </div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  _SeqNumber __k = <span class="keyword">static_cast<</span>_SeqNumber<span class="keyword">></span>(__seqs_end - __seqs_begin);</div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span> </div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  _LT __lt(__k, __comp);</div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span> </div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  <span class="comment">// Default value for potentially non-default-constructible types.</span></div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  _ValueType* __arbitrary_element = 0;</div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span> </div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  <span class="keywordflow">for</span> (_SeqNumber __t = 0; __t < __k; ++__t)</div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  {</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  <span class="keywordflow">if</span>(!__arbitrary_element</div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  && <a class="code" href="a01319.html#a2693f6e2ecfb03bdb564ca578f60b085" title="Length of a sequence described by a pair of iterators.">_GLIBCXX_PARALLEL_LENGTH</a>(__seqs_begin[__t]) > 0)</div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  __arbitrary_element = &(*__seqs_begin[__t].first);</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  }</div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span> </div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <span class="keywordflow">for</span> (_SeqNumber __t = 0; __t < __k; ++__t)</div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  {</div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  <span class="keywordflow">if</span> (__seqs_begin[__t].first == __seqs_begin[__t].second)</div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  __lt.__insert_start(*__arbitrary_element, __t, <span class="keyword">true</span>);</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  __lt.__insert_start(*__seqs_begin[__t].first, __t, <span class="keyword">false</span>);</div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  }</div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span> </div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  __lt.__init();</div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span> </div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  _SeqNumber __source;</div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span> </div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  <span class="keywordflow">for</span> (_DifferenceType __i = 0; __i < __length; ++__i)</div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  {</div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  <span class="comment">//take out</span></div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span>  __source = __lt.__get_min_source();</div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span> </div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  *(__target++) = *(__seqs_begin[__source].first++);</div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span> </div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  <span class="comment">// Feed.</span></div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span>  <span class="keywordflow">if</span> (__seqs_begin[__source].first == __seqs_begin[__source].second)</div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  __lt.__delete_min_insert(*__arbitrary_element, <span class="keyword">true</span>);</div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  <span class="comment">// Replace from same __source.</span></div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  __lt.__delete_min_insert(*__seqs_begin[__source].first, <span class="keyword">false</span>);</div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  }</div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span> </div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  }</div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span> <span class="comment"></span></div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span> <span class="comment"> /** @brief Multi-way merging procedure for a high branching factor,</span></div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span> <span class="comment"> * unguarded case.</span></div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span> <span class="comment"> * Merging is done using the LoserTree class <tt>_LT</tt>.</span></div>
<div class="line"><a name="l00555"></a><span class="lineno"> 555</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span> <span class="comment"> * Stability is selected by the used LoserTrees.</span></div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span> <span class="comment"> * @pre No input will run out of elements during the merge.</span></div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00560"></a><span class="lineno"> 560</span> <span class="comment"> * @param __seqs_begin Begin iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00561"></a><span class="lineno"> 561</span> <span class="comment"> * @param __seqs_end End iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00562"></a><span class="lineno"> 562</span> <span class="comment"> * @param __target Begin iterator of output sequence.</span></div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span> <span class="comment"> * @param __comp Comparator.</span></div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span> <span class="comment"> * @param __length Maximum length to merge, less equal than the</span></div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span> <span class="comment"> * total number of elements available.</span></div>
<div class="line"><a name="l00566"></a><span class="lineno"> 566</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span> <span class="comment"> * @return End iterator of output sequence.</span></div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _LT,</div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  <span class="keyword">typename</span> _DifferenceTp, <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  _RAIter3</div>
<div class="line"><a name="l00574"></a><span class="lineno"><a class="code" href="a01597.html#a3ffd0c9da50da6118291d38f95d44b52"> 574</a></span>  <a class="code" href="a01597.html#a3ffd0c9da50da6118291d38f95d44b52" title="Multi-way merging procedure for a high branching factor, unguarded case.">multiway_merge_loser_tree_unguarded</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  <span class="keyword">const</span> <span class="keyword">typename</span> std::iterator_traits<<span class="keyword">typename</span> std::iterator_traits<</div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  _RAIterIterator>::value_type::first_type>::value_type&</div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  __sentinel,</div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  _DifferenceTp __length,</div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  _Compare __comp)</div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  {</div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__length)</div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span> </div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  ::difference_type _SeqNumber;</div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  ::value_type::first_type</div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  _RAIter1;</div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  _ValueType;</div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span> </div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  _SeqNumber __k = __seqs_end - __seqs_begin;</div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span> </div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  _LT __lt(__k, __sentinel, __comp);</div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span> </div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  <span class="keywordflow">for</span> (_SeqNumber __t = 0; __t < __k; ++__t)</div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  {</div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span> <span class="preprocessor"></span> _GLIBCXX_PARALLEL_ASSERT(__seqs_begin[__t].first</div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  != __seqs_begin[__t].second);</div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span> <span class="preprocessor"></span> __lt.__insert_start(*__seqs_begin[__t].first, __t, <span class="keyword">false</span>);</div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  }</div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span> </div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  __lt.__init();</div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span> </div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  _SeqNumber __source;</div>
<div class="line"><a name="l00610"></a><span class="lineno"> 610</span> </div>
<div class="line"><a name="l00611"></a><span class="lineno"> 611</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00612"></a><span class="lineno"> 612</span> <span class="preprocessor"></span> _DifferenceType __i = 0;</div>
<div class="line"><a name="l00613"></a><span class="lineno"> 613</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00614"></a><span class="lineno"> 614</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  _RAIter3 __target_end = __target + __length;</div>
<div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  <span class="keywordflow">while</span> (__target < __target_end)</div>
<div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  {</div>
<div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  <span class="comment">// Take out.</span></div>
<div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  __source = __lt.__get_min_source();</div>
<div class="line"><a name="l00620"></a><span class="lineno"> 620</span> </div>
<div class="line"><a name="l00621"></a><span class="lineno"> 621</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00622"></a><span class="lineno"> 622</span> <span class="preprocessor"></span> _GLIBCXX_PARALLEL_ASSERT(0 <= __source && __source < __k);</div>
<div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  _GLIBCXX_PARALLEL_ASSERT(__i == 0</div>
<div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  || !__comp(*(__seqs_begin[__source].first), *(__target - 1)));</div>
<div class="line"><a name="l00625"></a><span class="lineno"> 625</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00626"></a><span class="lineno"> 626</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  <span class="comment">// Feed.</span></div>
<div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  *(__target++) = *(__seqs_begin[__source].first++);</div>
<div class="line"><a name="l00629"></a><span class="lineno"> 629</span> </div>
<div class="line"><a name="l00630"></a><span class="lineno"> 630</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00631"></a><span class="lineno"> 631</span> <span class="preprocessor"></span> ++__i;</div>
<div class="line"><a name="l00632"></a><span class="lineno"> 632</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span> <span class="preprocessor"></span> <span class="comment">// Replace from same __source.</span></div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  __lt.__delete_min_insert(*__seqs_begin[__source].first, <span class="keyword">false</span>);</div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  }</div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span> </div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span>  }</div>
<div class="line"><a name="l00639"></a><span class="lineno"> 639</span> </div>
<div class="line"><a name="l00640"></a><span class="lineno"> 640</span> <span class="comment"></span></div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span> <span class="comment"> /** @brief Multi-way merging procedure for a high branching factor,</span></div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span> <span class="comment"> * requiring sentinels to exist.</span></div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span> <span class="comment"> * @tparam UnguardedLoserTree _Loser Tree variant to use for the unguarded</span></div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span> <span class="comment"> * merging.</span></div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00647"></a><span class="lineno"> 647</span> <span class="comment"> * @param __seqs_begin Begin iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00648"></a><span class="lineno"> 648</span> <span class="comment"> * @param __seqs_end End iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00649"></a><span class="lineno"> 649</span> <span class="comment"> * @param __target Begin iterator of output sequence.</span></div>
<div class="line"><a name="l00650"></a><span class="lineno"> 650</span> <span class="comment"> * @param __comp Comparator.</span></div>
<div class="line"><a name="l00651"></a><span class="lineno"> 651</span> <span class="comment"> * @param __length Maximum length to merge, less equal than the</span></div>
<div class="line"><a name="l00652"></a><span class="lineno"> 652</span> <span class="comment"> * total number of elements available.</span></div>
<div class="line"><a name="l00653"></a><span class="lineno"> 653</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00654"></a><span class="lineno"> 654</span> <span class="comment"> * @return End iterator of output sequence.</span></div>
<div class="line"><a name="l00655"></a><span class="lineno"> 655</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  <span class="keyword">template</span><<span class="keyword">typename</span> UnguardedLoserTree,</div>
<div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00659"></a><span class="lineno"> 659</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00660"></a><span class="lineno"> 660</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00661"></a><span class="lineno"> 661</span>  _RAIter3</div>
<div class="line"><a name="l00662"></a><span class="lineno"><a class="code" href="a01597.html#a686704fa4da0a4fdbc6800fe46048366"> 662</a></span>  <a class="code" href="a01597.html#a686704fa4da0a4fdbc6800fe46048366" title="Multi-way merging procedure for a high branching factor, requiring sentinels to exist.">multiway_merge_loser_tree_sentinel</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  <span class="keyword">const</span> <span class="keyword">typename</span> std::iterator_traits<<span class="keyword">typename</span> std::iterator_traits<</div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  _RAIterIterator>::value_type::first_type>::value_type&</div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  __sentinel,</div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span>  _DifferenceTp __length,</div>
<div class="line"><a name="l00669"></a><span class="lineno"> 669</span>  _Compare __comp)</div>
<div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  {</div>
<div class="line"><a name="l00671"></a><span class="lineno"> 671</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__length)</div>
<div class="line"><a name="l00672"></a><span class="lineno"> 672</span> </div>
<div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  <span class="keyword">typedef</span> std::iterator_traits<_RAIterIterator> _TraitsType;</div>
<div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  ::value_type::first_type</div>
<div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  _RAIter1;</div>
<div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  _ValueType;</div>
<div class="line"><a name="l00680"></a><span class="lineno"> 680</span> </div>
<div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  _RAIter3 __target_end;</div>
<div class="line"><a name="l00682"></a><span class="lineno"> 682</span> </div>
<div class="line"><a name="l00683"></a><span class="lineno"> 683</span>  <span class="keywordflow">for</span> (_RAIterIterator __s = __seqs_begin; __s != __seqs_end; ++__s)</div>
<div class="line"><a name="l00684"></a><span class="lineno"> 684</span>  <span class="comment">// Move the sequence ends to the sentinel. This has the</span></div>
<div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  <span class="comment">// effect that the sentinel appears to be within the sequence. Then,</span></div>
<div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  <span class="comment">// we can use the unguarded variant if we merge out as many</span></div>
<div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  <span class="comment">// non-sentinel elements as we have.</span></div>
<div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  ++((*__s).second);</div>
<div class="line"><a name="l00689"></a><span class="lineno"> 689</span> </div>
<div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  __target_end = multiway_merge_loser_tree_unguarded<UnguardedLoserTree></div>
<div class="line"><a name="l00691"></a><span class="lineno"> 691</span>  (__seqs_begin, __seqs_end, __target, __sentinel, __length, __comp);</div>
<div class="line"><a name="l00692"></a><span class="lineno"> 692</span> </div>
<div class="line"><a name="l00693"></a><span class="lineno"> 693</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00694"></a><span class="lineno"> 694</span> <span class="preprocessor"></span> _GLIBCXX_PARALLEL_ASSERT(__target_end == __target + __length);</div>
<div class="line"><a name="l00695"></a><span class="lineno"> 695</span>  _GLIBCXX_PARALLEL_ASSERT(<a class="code" href="a01597.html#a34e76513fa46ae5c7bc8c45677289112" title="Check whether [__begin, __end) is sorted according to __comp.">__is_sorted</a>(__target, __target_end, __comp));</div>
<div class="line"><a name="l00696"></a><span class="lineno"> 696</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00697"></a><span class="lineno"> 697</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  <span class="comment">// Restore the sequence ends so the sentinels are not contained in the</span></div>
<div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  <span class="comment">// sequence any more (see comment in loop above).</span></div>
<div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  <span class="keywordflow">for</span> (_RAIterIterator __s = __seqs_begin; __s != __seqs_end; ++__s)</div>
<div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  --((*__s).second);</div>
<div class="line"><a name="l00702"></a><span class="lineno"> 702</span> </div>
<div class="line"><a name="l00703"></a><span class="lineno"> 703</span>  <span class="keywordflow">return</span> __target_end;</div>
<div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  }</div>
<div class="line"><a name="l00705"></a><span class="lineno"> 705</span> <span class="comment"></span></div>
<div class="line"><a name="l00706"></a><span class="lineno"> 706</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00707"></a><span class="lineno"> 707</span> <span class="comment"> * @brief Traits for determining whether the loser tree should</span></div>
<div class="line"><a name="l00708"></a><span class="lineno"> 708</span> <span class="comment"> * use pointers or copies.</span></div>
<div class="line"><a name="l00709"></a><span class="lineno"> 709</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00710"></a><span class="lineno"> 710</span> <span class="comment"> * The field "_M_use_pointer" is used to determine whether to use pointers</span></div>
<div class="line"><a name="l00711"></a><span class="lineno"> 711</span> <span class="comment"> * in he loser trees or whether to copy the values into the loser tree.</span></div>
<div class="line"><a name="l00712"></a><span class="lineno"> 712</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00713"></a><span class="lineno"> 713</span> <span class="comment"> * The default behavior is to use pointers if the data type is 4 times as</span></div>
<div class="line"><a name="l00714"></a><span class="lineno"> 714</span> <span class="comment"> * big as the pointer to it.</span></div>
<div class="line"><a name="l00715"></a><span class="lineno"> 715</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00716"></a><span class="lineno"> 716</span> <span class="comment"> * Specialize for your data type to customize the behavior.</span></div>
<div class="line"><a name="l00717"></a><span class="lineno"> 717</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00718"></a><span class="lineno"> 718</span> <span class="comment"> * Example:</span></div>
<div class="line"><a name="l00719"></a><span class="lineno"> 719</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00720"></a><span class="lineno"> 720</span> <span class="comment"> * template<></span></div>
<div class="line"><a name="l00721"></a><span class="lineno"> 721</span> <span class="comment"> * struct _LoserTreeTraits<int></span></div>
<div class="line"><a name="l00722"></a><span class="lineno"> 722</span> <span class="comment"> * { static const bool _M_use_pointer = false; };</span></div>
<div class="line"><a name="l00723"></a><span class="lineno"> 723</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00724"></a><span class="lineno"> 724</span> <span class="comment"> * template<></span></div>
<div class="line"><a name="l00725"></a><span class="lineno"> 725</span> <span class="comment"> * struct _LoserTreeTraits<heavyweight_type></span></div>
<div class="line"><a name="l00726"></a><span class="lineno"> 726</span> <span class="comment"> * { static const bool _M_use_pointer = true; };</span></div>
<div class="line"><a name="l00727"></a><span class="lineno"> 727</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00728"></a><span class="lineno"> 728</span> <span class="comment"> * @param _Tp type to give the loser tree traits for.</span></div>
<div class="line"><a name="l00729"></a><span class="lineno"> 729</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00730"></a><span class="lineno"> 730</span>  <span class="keyword">template</span> <<span class="keyword">typename</span> _Tp></div>
<div class="line"><a name="l00731"></a><span class="lineno"><a class="code" href="a00147.html"> 731</a></span>  <span class="keyword">struct </span><a class="code" href="a00147.html" title="Traits for determining whether the loser tree should use pointers or copies.">_LoserTreeTraits</a></div>
<div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  {<span class="comment"></span></div>
<div class="line"><a name="l00733"></a><span class="lineno"> 733</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00734"></a><span class="lineno"> 734</span> <span class="comment"> * @brief True iff to use pointers instead of values in loser trees.</span></div>
<div class="line"><a name="l00735"></a><span class="lineno"> 735</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00736"></a><span class="lineno"> 736</span> <span class="comment"> * The default behavior is to use pointers if the data type is four</span></div>
<div class="line"><a name="l00737"></a><span class="lineno"> 737</span> <span class="comment"> * times as big as the pointer to it.</span></div>
<div class="line"><a name="l00738"></a><span class="lineno"> 738</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00739"></a><span class="lineno"><a class="code" href="a00147.html#ae896521258e61f2158af412742d7276b"> 739</a></span>  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> <a class="code" href="a00147.html#ae896521258e61f2158af412742d7276b" title="True iff to use pointers instead of values in loser trees.">_M_use_pointer</a> = (<span class="keyword">sizeof</span>(_Tp) > 4 * <span class="keyword">sizeof</span>(_Tp*));</div>
<div class="line"><a name="l00740"></a><span class="lineno"> 740</span>  };</div>
<div class="line"><a name="l00741"></a><span class="lineno"> 741</span> <span class="comment"></span></div>
<div class="line"><a name="l00742"></a><span class="lineno"> 742</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00743"></a><span class="lineno"> 743</span> <span class="comment"> * @brief Switch for 3-way merging with __sentinels turned off.</span></div>
<div class="line"><a name="l00744"></a><span class="lineno"> 744</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00745"></a><span class="lineno"> 745</span> <span class="comment"> * Note that 3-way merging is always stable!</span></div>
<div class="line"><a name="l00746"></a><span class="lineno"> 746</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00747"></a><span class="lineno"> 747</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __sentinels <span class="comment">/*default == false*/</span>,</div>
<div class="line"><a name="l00748"></a><span class="lineno"> 748</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00749"></a><span class="lineno"> 749</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00750"></a><span class="lineno"> 750</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00751"></a><span class="lineno"> 751</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00752"></a><span class="lineno"><a class="code" href="a00113.html"> 752</a></span>  <span class="keyword">struct </span><a class="code" href="a00113.html" title="Switch for 3-way merging with __sentinels turned off.">__multiway_merge_3_variant_sentinel_switch</a></div>
<div class="line"><a name="l00753"></a><span class="lineno"> 753</span>  {</div>
<div class="line"><a name="l00754"></a><span class="lineno"> 754</span>  _RAIter3</div>
<div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  operator()(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00757"></a><span class="lineno"> 757</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00758"></a><span class="lineno"> 758</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  { <span class="keywordflow">return</span> multiway_merge_3_variant<_GuardedIterator></div>
<div class="line"><a name="l00760"></a><span class="lineno"> 760</span>  (__seqs_begin, __seqs_end, __target, __length, __comp); }</div>
<div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  };</div>
<div class="line"><a name="l00762"></a><span class="lineno"> 762</span> <span class="comment"></span></div>
<div class="line"><a name="l00763"></a><span class="lineno"> 763</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00764"></a><span class="lineno"> 764</span> <span class="comment"> * @brief Switch for 3-way merging with __sentinels turned on.</span></div>
<div class="line"><a name="l00765"></a><span class="lineno"> 765</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00766"></a><span class="lineno"> 766</span> <span class="comment"> * Note that 3-way merging is always stable!</span></div>
<div class="line"><a name="l00767"></a><span class="lineno"> 767</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00768"></a><span class="lineno"> 768</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00769"></a><span class="lineno"> 769</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00770"></a><span class="lineno"> 770</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00771"></a><span class="lineno"> 771</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00772"></a><span class="lineno"><a class="code" href="a00114.html"> 772</a></span>  <span class="keyword">struct </span><a class="code" href="a00113.html" title="Switch for 3-way merging with __sentinels turned off.">__multiway_merge_3_variant_sentinel_switch</a><true, _RAIterIterator,</div>
<div class="line"><a name="l00773"></a><span class="lineno"> 773</span>  _RAIter3, _DifferenceTp,</div>
<div class="line"><a name="l00774"></a><span class="lineno"> 774</span>  _Compare></div>
<div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  {</div>
<div class="line"><a name="l00776"></a><span class="lineno"> 776</span>  _RAIter3</div>
<div class="line"><a name="l00777"></a><span class="lineno"> 777</span>  operator()(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00778"></a><span class="lineno"> 778</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00780"></a><span class="lineno"> 780</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  { <span class="keywordflow">return</span> multiway_merge_3_variant<_UnguardedIterator></div>
<div class="line"><a name="l00782"></a><span class="lineno"> 782</span>  (__seqs_begin, __seqs_end, __target, __length, __comp); }</div>
<div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  };</div>
<div class="line"><a name="l00784"></a><span class="lineno"> 784</span> <span class="comment"></span></div>
<div class="line"><a name="l00785"></a><span class="lineno"> 785</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00786"></a><span class="lineno"> 786</span> <span class="comment"> * @brief Switch for 4-way merging with __sentinels turned off.</span></div>
<div class="line"><a name="l00787"></a><span class="lineno"> 787</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00788"></a><span class="lineno"> 788</span> <span class="comment"> * Note that 4-way merging is always stable!</span></div>
<div class="line"><a name="l00789"></a><span class="lineno"> 789</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00790"></a><span class="lineno"> 790</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __sentinels <span class="comment">/*default == false*/</span>,</div>
<div class="line"><a name="l00791"></a><span class="lineno"> 791</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00792"></a><span class="lineno"> 792</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00794"></a><span class="lineno"> 794</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00795"></a><span class="lineno"><a class="code" href="a00115.html"> 795</a></span>  <span class="keyword">struct </span><a class="code" href="a00115.html" title="Switch for 4-way merging with __sentinels turned off.">__multiway_merge_4_variant_sentinel_switch</a></div>
<div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  {</div>
<div class="line"><a name="l00797"></a><span class="lineno"> 797</span>  _RAIter3</div>
<div class="line"><a name="l00798"></a><span class="lineno"> 798</span>  operator()(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00799"></a><span class="lineno"> 799</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00800"></a><span class="lineno"> 800</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00801"></a><span class="lineno"> 801</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  { <span class="keywordflow">return</span> multiway_merge_4_variant<_GuardedIterator></div>
<div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  (__seqs_begin, __seqs_end, __target, __length, __comp); }</div>
<div class="line"><a name="l00804"></a><span class="lineno"> 804</span>  };</div>
<div class="line"><a name="l00805"></a><span class="lineno"> 805</span> <span class="comment"></span></div>
<div class="line"><a name="l00806"></a><span class="lineno"> 806</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00807"></a><span class="lineno"> 807</span> <span class="comment"> * @brief Switch for 4-way merging with __sentinels turned on.</span></div>
<div class="line"><a name="l00808"></a><span class="lineno"> 808</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00809"></a><span class="lineno"> 809</span> <span class="comment"> * Note that 4-way merging is always stable!</span></div>
<div class="line"><a name="l00810"></a><span class="lineno"> 810</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00811"></a><span class="lineno"> 811</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00815"></a><span class="lineno"><a class="code" href="a00116.html"> 815</a></span>  <span class="keyword">struct </span><a class="code" href="a00115.html" title="Switch for 4-way merging with __sentinels turned off.">__multiway_merge_4_variant_sentinel_switch</a><true, _RAIterIterator,</div>
<div class="line"><a name="l00816"></a><span class="lineno"> 816</span>  _RAIter3, _DifferenceTp,</div>
<div class="line"><a name="l00817"></a><span class="lineno"> 817</span>  _Compare></div>
<div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  {</div>
<div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  _RAIter3</div>
<div class="line"><a name="l00820"></a><span class="lineno"> 820</span>  operator()(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00823"></a><span class="lineno"> 823</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  { <span class="keywordflow">return</span> multiway_merge_4_variant<_UnguardedIterator></div>
<div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  (__seqs_begin, __seqs_end, __target, __length, __comp); }</div>
<div class="line"><a name="l00826"></a><span class="lineno"> 826</span>  };</div>
<div class="line"><a name="l00827"></a><span class="lineno"> 827</span> <span class="comment"></span></div>
<div class="line"><a name="l00828"></a><span class="lineno"> 828</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00829"></a><span class="lineno"> 829</span> <span class="comment"> * @brief Switch for k-way merging with __sentinels turned on.</span></div>
<div class="line"><a name="l00830"></a><span class="lineno"> 830</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __sentinels,</div>
<div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  <span class="keywordtype">bool</span> __stable,</div>
<div class="line"><a name="l00833"></a><span class="lineno"> 833</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00837"></a><span class="lineno"><a class="code" href="a00117.html"> 837</a></span>  <span class="keyword">struct </span><a class="code" href="a00117.html" title="Switch for k-way merging with __sentinels turned on.">__multiway_merge_k_variant_sentinel_switch</a></div>
<div class="line"><a name="l00838"></a><span class="lineno"> 838</span>  {</div>
<div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  _RAIter3</div>
<div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  operator()(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  <span class="keyword">const</span> <span class="keyword">typename</span> std::iterator_traits<<span class="keyword">typename</span> std::iterator_traits<</div>
<div class="line"><a name="l00844"></a><span class="lineno"> 844</span>  _RAIterIterator>::value_type::first_type>::value_type&</div>
<div class="line"><a name="l00845"></a><span class="lineno"> 845</span>  __sentinel,</div>
<div class="line"><a name="l00846"></a><span class="lineno"> 846</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00847"></a><span class="lineno"> 847</span>  {</div>
<div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  ::value_type::first_type</div>
<div class="line"><a name="l00850"></a><span class="lineno"> 850</span>  _RAIter1;</div>
<div class="line"><a name="l00851"></a><span class="lineno"> 851</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  _ValueType;</div>
<div class="line"><a name="l00853"></a><span class="lineno"> 853</span> </div>
<div class="line"><a name="l00854"></a><span class="lineno"> 854</span>  <span class="keywordflow">return</span> <a class="code" href="a01597.html#a686704fa4da0a4fdbc6800fe46048366" title="Multi-way merging procedure for a high branching factor, requiring sentinels to exist.">multiway_merge_loser_tree_sentinel</a><</div>
<div class="line"><a name="l00855"></a><span class="lineno"> 855</span>  <span class="keyword">typename</span> __gnu_cxx::__conditional_type<</div>
<div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  <a class="code" href="a00147.html" title="Traits for determining whether the loser tree should use pointers or copies.">_LoserTreeTraits<_ValueType>::_M_use_pointer</a>,</div>
<div class="line"><a name="l00857"></a><span class="lineno"> 857</span>  <a class="code" href="a00144.html" title="Stable unguarded _LoserTree variant storing pointers.">_LoserTreePointerUnguarded<__stable, _ValueType, _Compare></a>,</div>
<div class="line"><a name="l00858"></a><span class="lineno"> 858</span>  <a class="code" href="a00148.html" title="Stable implementation of unguarded _LoserTree.">_LoserTreeUnguarded<__stable, _ValueType, _Compare></a></div>
<div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  >::__type></div>
<div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  (__seqs_begin, __seqs_end, __target, __sentinel, __length, __comp);</div>
<div class="line"><a name="l00861"></a><span class="lineno"> 861</span>  }</div>
<div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  };</div>
<div class="line"><a name="l00863"></a><span class="lineno"> 863</span> <span class="comment"></span></div>
<div class="line"><a name="l00864"></a><span class="lineno"> 864</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l00865"></a><span class="lineno"> 865</span> <span class="comment"> * @brief Switch for k-way merging with __sentinels turned off.</span></div>
<div class="line"><a name="l00866"></a><span class="lineno"> 866</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00867"></a><span class="lineno"> 867</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __stable,</div>
<div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00869"></a><span class="lineno"> 869</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00871"></a><span class="lineno"> 871</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00872"></a><span class="lineno"><a class="code" href="a00118.html"> 872</a></span>  <span class="keyword">struct </span><a class="code" href="a00117.html" title="Switch for k-way merging with __sentinels turned on.">__multiway_merge_k_variant_sentinel_switch</a><false, __stable,</div>
<div class="line"><a name="l00873"></a><span class="lineno"> 873</span>  _RAIterIterator,</div>
<div class="line"><a name="l00874"></a><span class="lineno"> 874</span>  _RAIter3, _DifferenceTp,</div>
<div class="line"><a name="l00875"></a><span class="lineno"> 875</span>  _Compare></div>
<div class="line"><a name="l00876"></a><span class="lineno"> 876</span>  {</div>
<div class="line"><a name="l00877"></a><span class="lineno"> 877</span>  _RAIter3</div>
<div class="line"><a name="l00878"></a><span class="lineno"> 878</span>  operator()(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00879"></a><span class="lineno"> 879</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00880"></a><span class="lineno"> 880</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00881"></a><span class="lineno"> 881</span>  <span class="keyword">const</span> <span class="keyword">typename</span> std::iterator_traits<<span class="keyword">typename</span> std::iterator_traits<</div>
<div class="line"><a name="l00882"></a><span class="lineno"> 882</span>  _RAIterIterator>::value_type::first_type>::value_type&</div>
<div class="line"><a name="l00883"></a><span class="lineno"> 883</span>  __sentinel,</div>
<div class="line"><a name="l00884"></a><span class="lineno"> 884</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00885"></a><span class="lineno"> 885</span>  {</div>
<div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00887"></a><span class="lineno"> 887</span>  ::value_type::first_type</div>
<div class="line"><a name="l00888"></a><span class="lineno"> 888</span>  _RAIter1;</div>
<div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l00890"></a><span class="lineno"> 890</span>  _ValueType;</div>
<div class="line"><a name="l00891"></a><span class="lineno"> 891</span> </div>
<div class="line"><a name="l00892"></a><span class="lineno"> 892</span>  <span class="keywordflow">return</span> <a class="code" href="a01597.html#a150b06a4da2cf1cff673d1b6242c27fa" title="Multi-way merging procedure for a high branching factor, guarded case.">multiway_merge_loser_tree</a><</div>
<div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  <span class="keyword">typename</span> __gnu_cxx::__conditional_type<</div>
<div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  <a class="code" href="a00147.html" title="Traits for determining whether the loser tree should use pointers or copies.">_LoserTreeTraits<_ValueType>::_M_use_pointer</a>,</div>
<div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  <a class="code" href="a00140.html" title="Stable _LoserTree implementation.">_LoserTreePointer<__stable, _ValueType, _Compare></a>,</div>
<div class="line"><a name="l00896"></a><span class="lineno"> 896</span>  <a class="code" href="a00136.html" title="Stable _LoserTree variant.">_LoserTree<__stable, _ValueType, _Compare></a></div>
<div class="line"><a name="l00897"></a><span class="lineno"> 897</span>  >::__type >(__seqs_begin, __seqs_end, __target, __length, __comp);</div>
<div class="line"><a name="l00898"></a><span class="lineno"> 898</span>  }</div>
<div class="line"><a name="l00899"></a><span class="lineno"> 899</span>  };</div>
<div class="line"><a name="l00900"></a><span class="lineno"> 900</span> <span class="comment"></span></div>
<div class="line"><a name="l00901"></a><span class="lineno"> 901</span> <span class="comment"> /** @brief Sequential multi-way merging switch.</span></div>
<div class="line"><a name="l00902"></a><span class="lineno"> 902</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00903"></a><span class="lineno"> 903</span> <span class="comment"> * The _GLIBCXX_PARALLEL_DECISION is based on the branching factor and</span></div>
<div class="line"><a name="l00904"></a><span class="lineno"> 904</span> <span class="comment"> * runtime settings.</span></div>
<div class="line"><a name="l00905"></a><span class="lineno"> 905</span> <span class="comment"> * @param __seqs_begin Begin iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00906"></a><span class="lineno"> 906</span> <span class="comment"> * @param __seqs_end End iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l00907"></a><span class="lineno"> 907</span> <span class="comment"> * @param __target Begin iterator of output sequence.</span></div>
<div class="line"><a name="l00908"></a><span class="lineno"> 908</span> <span class="comment"> * @param __comp Comparator.</span></div>
<div class="line"><a name="l00909"></a><span class="lineno"> 909</span> <span class="comment"> * @param __length Maximum length to merge, possibly larger than the</span></div>
<div class="line"><a name="l00910"></a><span class="lineno"> 910</span> <span class="comment"> * number of elements available.</span></div>
<div class="line"><a name="l00911"></a><span class="lineno"> 911</span> <span class="comment"> * @param __sentinel The sequences have __a __sentinel element.</span></div>
<div class="line"><a name="l00912"></a><span class="lineno"> 912</span> <span class="comment"> * @return End iterator of output sequence. */</span></div>
<div class="line"><a name="l00913"></a><span class="lineno"> 913</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __stable,</div>
<div class="line"><a name="l00914"></a><span class="lineno"> 914</span>  <span class="keywordtype">bool</span> __sentinels,</div>
<div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l00916"></a><span class="lineno"> 916</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l00918"></a><span class="lineno"> 918</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l00919"></a><span class="lineno"> 919</span>  _RAIter3</div>
<div class="line"><a name="l00920"></a><span class="lineno"><a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d"> 920</a></span>  <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l00921"></a><span class="lineno"> 921</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l00922"></a><span class="lineno"> 922</span>  _RAIter3 __target,</div>
<div class="line"><a name="l00923"></a><span class="lineno"> 923</span>  <span class="keyword">const</span> <span class="keyword">typename</span> std::iterator_traits<<span class="keyword">typename</span> std::iterator_traits<</div>
<div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  _RAIterIterator>::value_type::first_type>::value_type&</div>
<div class="line"><a name="l00925"></a><span class="lineno"> 925</span>  __sentinel,</div>
<div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  _DifferenceTp __length, _Compare __comp)</div>
<div class="line"><a name="l00927"></a><span class="lineno"> 927</span>  {</div>
<div class="line"><a name="l00928"></a><span class="lineno"> 928</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__length)</div>
<div class="line"><a name="l00929"></a><span class="lineno"> 929</span> </div>
<div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  ::difference_type _SeqNumber;</div>
<div class="line"><a name="l00933"></a><span class="lineno"> 933</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  ::value_type::first_type</div>
<div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  _RAIter1;</div>
<div class="line"><a name="l00936"></a><span class="lineno"> 936</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l00937"></a><span class="lineno"> 937</span>  _ValueType;</div>
<div class="line"><a name="l00938"></a><span class="lineno"> 938</span> </div>
<div class="line"><a name="l00939"></a><span class="lineno"> 939</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00940"></a><span class="lineno"> 940</span> <span class="preprocessor"></span> <span class="keywordflow">for</span> (_RAIterIterator __s = __seqs_begin; __s != __seqs_end; ++__s)</div>
<div class="line"><a name="l00941"></a><span class="lineno"> 941</span>  {</div>
<div class="line"><a name="l00942"></a><span class="lineno"> 942</span>  _GLIBCXX_PARALLEL_ASSERT(<a class="code" href="a01597.html#a34e76513fa46ae5c7bc8c45677289112" title="Check whether [__begin, __end) is sorted according to __comp.">__is_sorted</a>((*__s).first,</div>
<div class="line"><a name="l00943"></a><span class="lineno"> 943</span>  (*__s).second, __comp));</div>
<div class="line"><a name="l00944"></a><span class="lineno"> 944</span>  }</div>
<div class="line"><a name="l00945"></a><span class="lineno"> 945</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00946"></a><span class="lineno"> 946</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  _DifferenceTp __total_length = 0;</div>
<div class="line"><a name="l00948"></a><span class="lineno"> 948</span>  <span class="keywordflow">for</span> (_RAIterIterator __s = __seqs_begin; __s != __seqs_end; ++__s)</div>
<div class="line"><a name="l00949"></a><span class="lineno"> 949</span>  __total_length += <a class="code" href="a01319.html#a2693f6e2ecfb03bdb564ca578f60b085" title="Length of a sequence described by a pair of iterators.">_GLIBCXX_PARALLEL_LENGTH</a>(*__s);</div>
<div class="line"><a name="l00950"></a><span class="lineno"> 950</span> </div>
<div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  __length = std::min<_DifferenceTp>(__length, __total_length);</div>
<div class="line"><a name="l00952"></a><span class="lineno"> 952</span> </div>
<div class="line"><a name="l00953"></a><span class="lineno"> 953</span>  <span class="keywordflow">if</span>(__length == 0)</div>
<div class="line"><a name="l00954"></a><span class="lineno"> 954</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l00955"></a><span class="lineno"> 955</span> </div>
<div class="line"><a name="l00956"></a><span class="lineno"> 956</span>  _RAIter3 __return_target = __target;</div>
<div class="line"><a name="l00957"></a><span class="lineno"> 957</span>  _SeqNumber __k = <span class="keyword">static_cast<</span>_SeqNumber<span class="keyword">></span>(__seqs_end - __seqs_begin);</div>
<div class="line"><a name="l00958"></a><span class="lineno"> 958</span> </div>
<div class="line"><a name="l00959"></a><span class="lineno"> 959</span>  <span class="keywordflow">switch</span> (__k)</div>
<div class="line"><a name="l00960"></a><span class="lineno"> 960</span>  {</div>
<div class="line"><a name="l00961"></a><span class="lineno"> 961</span>  <span class="keywordflow">case</span> 0:</div>
<div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00963"></a><span class="lineno"> 963</span>  <span class="keywordflow">case</span> 1:</div>
<div class="line"><a name="l00964"></a><span class="lineno"> 964</span>  __return_target = std::copy(__seqs_begin[0].first,</div>
<div class="line"><a name="l00965"></a><span class="lineno"> 965</span>  __seqs_begin[0].first + __length,</div>
<div class="line"><a name="l00966"></a><span class="lineno"> 966</span>  __target);</div>
<div class="line"><a name="l00967"></a><span class="lineno"> 967</span>  __seqs_begin[0].first += __length;</div>
<div class="line"><a name="l00968"></a><span class="lineno"> 968</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00969"></a><span class="lineno"> 969</span>  <span class="keywordflow">case</span> 2:</div>
<div class="line"><a name="l00970"></a><span class="lineno"> 970</span>  __return_target = <a class="code" href="a01597.html#a0059cd13cc6ab70692f8309ad92cb548" title="Merge routine being able to merge only the __max_length smallest elements.">__merge_advance</a>(__seqs_begin[0].first,</div>
<div class="line"><a name="l00971"></a><span class="lineno"> 971</span>  __seqs_begin[0].second,</div>
<div class="line"><a name="l00972"></a><span class="lineno"> 972</span>  __seqs_begin[1].first,</div>
<div class="line"><a name="l00973"></a><span class="lineno"> 973</span>  __seqs_begin[1].second,</div>
<div class="line"><a name="l00974"></a><span class="lineno"> 974</span>  __target, __length, __comp);</div>
<div class="line"><a name="l00975"></a><span class="lineno"> 975</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00976"></a><span class="lineno"> 976</span>  <span class="keywordflow">case</span> 3:</div>
<div class="line"><a name="l00977"></a><span class="lineno"> 977</span>  __return_target = <a class="code" href="a00113.html" title="Switch for 3-way merging with __sentinels turned off.">__multiway_merge_3_variant_sentinel_switch</a></div>
<div class="line"><a name="l00978"></a><span class="lineno"> 978</span>  <__sentinels, _RAIterIterator, _RAIter3, _DifferenceTp, _Compare>()</div>
<div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  (__seqs_begin, __seqs_end, __target, __length, __comp);</div>
<div class="line"><a name="l00980"></a><span class="lineno"> 980</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  <span class="keywordflow">case</span> 4:</div>
<div class="line"><a name="l00982"></a><span class="lineno"> 982</span>  __return_target = <a class="code" href="a00115.html" title="Switch for 4-way merging with __sentinels turned off.">__multiway_merge_4_variant_sentinel_switch</a></div>
<div class="line"><a name="l00983"></a><span class="lineno"> 983</span>  <__sentinels, _RAIterIterator, _RAIter3, _DifferenceTp, _Compare>()</div>
<div class="line"><a name="l00984"></a><span class="lineno"> 984</span>  (__seqs_begin, __seqs_end, __target, __length, __comp);</div>
<div class="line"><a name="l00985"></a><span class="lineno"> 985</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00986"></a><span class="lineno"> 986</span>  <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00987"></a><span class="lineno"> 987</span>  __return_target = <a class="code" href="a00117.html" title="Switch for k-way merging with __sentinels turned on.">__multiway_merge_k_variant_sentinel_switch</a></div>
<div class="line"><a name="l00988"></a><span class="lineno"> 988</span>  <__sentinels, __stable, _RAIterIterator, _RAIter3, _DifferenceTp,</div>
<div class="line"><a name="l00989"></a><span class="lineno"> 989</span>  _Compare>()</div>
<div class="line"><a name="l00990"></a><span class="lineno"> 990</span>  (__seqs_begin, __seqs_end, __target, __sentinel, __length, __comp);</div>
<div class="line"><a name="l00991"></a><span class="lineno"> 991</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00992"></a><span class="lineno"> 992</span>  }</div>
<div class="line"><a name="l00993"></a><span class="lineno"> 993</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l00994"></a><span class="lineno"> 994</span> <span class="preprocessor"></span> _GLIBCXX_PARALLEL_ASSERT(</div>
<div class="line"><a name="l00995"></a><span class="lineno"> 995</span>  <a class="code" href="a01597.html#a34e76513fa46ae5c7bc8c45677289112" title="Check whether [__begin, __end) is sorted according to __comp.">__is_sorted</a>(__target, __target + __length, __comp));</div>
<div class="line"><a name="l00996"></a><span class="lineno"> 996</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00997"></a><span class="lineno"> 997</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l00998"></a><span class="lineno"> 998</span>  <span class="keywordflow">return</span> __return_target;</div>
<div class="line"><a name="l00999"></a><span class="lineno"> 999</span>  }</div>
<div class="line"><a name="l01000"></a><span class="lineno"> 1000</span> <span class="comment"></span></div>
<div class="line"><a name="l01001"></a><span class="lineno"> 1001</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l01002"></a><span class="lineno"> 1002</span> <span class="comment"> * @brief Stable sorting functor.</span></div>
<div class="line"><a name="l01003"></a><span class="lineno"> 1003</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01004"></a><span class="lineno"> 1004</span> <span class="comment"> * Used to reduce code instanciation in multiway_merge_sampling_splitting.</span></div>
<div class="line"><a name="l01005"></a><span class="lineno"> 1005</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01006"></a><span class="lineno"> 1006</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __stable, <span class="keyword">class</span> _RAIter, <span class="keyword">class</span> _StrictWeakOrdering></div>
<div class="line"><a name="l01007"></a><span class="lineno"><a class="code" href="a00161.html"> 1007</a></span>  <span class="keyword">struct </span><a class="code" href="a00161.html" title="Stable sorting functor.">_SamplingSorter</a></div>
<div class="line"><a name="l01008"></a><span class="lineno"> 1008</span>  {</div>
<div class="line"><a name="l01009"></a><span class="lineno"> 1009</span>  <span class="keywordtype">void</span></div>
<div class="line"><a name="l01010"></a><span class="lineno"> 1010</span>  operator()(_RAIter __first, _RAIter __last, _StrictWeakOrdering __comp)</div>
<div class="line"><a name="l01011"></a><span class="lineno"> 1011</span>  { __gnu_sequential::stable_sort(__first, __last, __comp); }</div>
<div class="line"><a name="l01012"></a><span class="lineno"> 1012</span>  };</div>
<div class="line"><a name="l01013"></a><span class="lineno"> 1013</span> <span class="comment"></span></div>
<div class="line"><a name="l01014"></a><span class="lineno"> 1014</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l01015"></a><span class="lineno"> 1015</span> <span class="comment"> * @brief Non-__stable sorting functor.</span></div>
<div class="line"><a name="l01016"></a><span class="lineno"> 1016</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01017"></a><span class="lineno"> 1017</span> <span class="comment"> * Used to reduce code instantiation in multiway_merge_sampling_splitting.</span></div>
<div class="line"><a name="l01018"></a><span class="lineno"> 1018</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01019"></a><span class="lineno"> 1019</span>  <span class="keyword">template</span><<span class="keyword">class</span> _RAIter, <span class="keyword">class</span> _StrictWeakOrdering></div>
<div class="line"><a name="l01020"></a><span class="lineno"><a class="code" href="a00162.html"> 1020</a></span>  <span class="keyword">struct </span><a class="code" href="a00161.html" title="Stable sorting functor.">_SamplingSorter</a><false, _RAIter, _StrictWeakOrdering></div>
<div class="line"><a name="l01021"></a><span class="lineno"> 1021</span>  {</div>
<div class="line"><a name="l01022"></a><span class="lineno"> 1022</span>  <span class="keywordtype">void</span></div>
<div class="line"><a name="l01023"></a><span class="lineno"> 1023</span>  operator()(_RAIter __first, _RAIter __last, _StrictWeakOrdering __comp)</div>
<div class="line"><a name="l01024"></a><span class="lineno"> 1024</span>  { __gnu_sequential::sort(__first, __last, __comp); }</div>
<div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>  };</div>
<div class="line"><a name="l01026"></a><span class="lineno"> 1026</span> <span class="comment"></span></div>
<div class="line"><a name="l01027"></a><span class="lineno"> 1027</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l01028"></a><span class="lineno"> 1028</span> <span class="comment"> * @brief Sampling based splitting for parallel multiway-merge routine.</span></div>
<div class="line"><a name="l01029"></a><span class="lineno"> 1029</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01030"></a><span class="lineno"> 1030</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __stable,</div>
<div class="line"><a name="l01031"></a><span class="lineno"> 1031</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>  <span class="keyword">typename</span> _Compare,</div>
<div class="line"><a name="l01033"></a><span class="lineno"> 1033</span>  <span class="keyword">typename</span> _DifferenceType></div>
<div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>  <span class="keywordtype">void</span></div>
<div class="line"><a name="l01035"></a><span class="lineno"><a class="code" href="a01597.html#a0e39d3891745fd0e244fb125bf34ce8b"> 1035</a></span>  <a class="code" href="a01597.html#a0e39d3891745fd0e244fb125bf34ce8b" title="Sampling based splitting for parallel multiway-merge routine.">multiway_merge_sampling_splitting</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l01036"></a><span class="lineno"> 1036</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l01037"></a><span class="lineno"> 1037</span>  _DifferenceType __length,</div>
<div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>  _DifferenceType __total_length,</div>
<div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>  _Compare __comp,</div>
<div class="line"><a name="l01040"></a><span class="lineno"> 1040</span>  <a class="code" href="a00957.html" title="A standard container which offers fixed time access to individual elements in any order...">std::vector</a><<a class="code" href="a00460.html" title="Struct holding two objects of arbitrary type.">std::pair<_DifferenceType, _DifferenceType></a> > *__pieces)</div>
<div class="line"><a name="l01041"></a><span class="lineno"> 1041</span>  {</div>
<div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l01043"></a><span class="lineno"> 1043</span>  ::difference_type _SeqNumber;</div>
<div class="line"><a name="l01044"></a><span class="lineno"> 1044</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l01045"></a><span class="lineno"> 1045</span>  ::value_type::first_type</div>
<div class="line"><a name="l01046"></a><span class="lineno"> 1046</span>  _RAIter1;</div>
<div class="line"><a name="l01047"></a><span class="lineno"> 1047</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIter1>::value_type</div>
<div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>  _ValueType;</div>
<div class="line"><a name="l01049"></a><span class="lineno"> 1049</span> </div>
<div class="line"><a name="l01050"></a><span class="lineno"> 1050</span>  <span class="comment">// __k sequences.</span></div>
<div class="line"><a name="l01051"></a><span class="lineno"> 1051</span>  <span class="keyword">const</span> _SeqNumber __k</div>
<div class="line"><a name="l01052"></a><span class="lineno"> 1052</span>  = <span class="keyword">static_cast<</span>_SeqNumber<span class="keyword">></span>(__seqs_end - __seqs_begin);</div>
<div class="line"><a name="l01053"></a><span class="lineno"> 1053</span> </div>
<div class="line"><a name="l01054"></a><span class="lineno"> 1054</span>  <span class="keyword">const</span> <a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a> __num_threads = omp_get_num_threads();</div>
<div class="line"><a name="l01055"></a><span class="lineno"> 1055</span> </div>
<div class="line"><a name="l01056"></a><span class="lineno"> 1056</span>  <span class="keyword">const</span> _DifferenceType __num_samples =</div>
<div class="line"><a name="l01057"></a><span class="lineno"> 1057</span>  <a class="code" href="a00163.html#abc4965eacae0b49945ebc887cb11adc1" title="Get the global settings.">__gnu_parallel::_Settings::get</a>().<a class="code" href="a00163.html#a14ded8ea54764e899f1d24ef1fe12b19" title="Oversampling factor for merge.">merge_oversampling</a> * __num_threads;</div>
<div class="line"><a name="l01058"></a><span class="lineno"> 1058</span> </div>
<div class="line"><a name="l01059"></a><span class="lineno"> 1059</span>  _ValueType* __samples = <span class="keyword">static_cast<</span>_ValueType*<span class="keyword">></span></div>
<div class="line"><a name="l01060"></a><span class="lineno"> 1060</span>  (::operator <span class="keyword">new</span>(<span class="keyword">sizeof</span>(_ValueType) * __k * __num_samples));</div>
<div class="line"><a name="l01061"></a><span class="lineno"> 1061</span>  <span class="comment">// Sample.</span></div>
<div class="line"><a name="l01062"></a><span class="lineno"> 1062</span>  <span class="keywordflow">for</span> (_SeqNumber __s = 0; __s < __k; ++__s)</div>
<div class="line"><a name="l01063"></a><span class="lineno"> 1063</span>  <span class="keywordflow">for</span> (_DifferenceType __i = 0; __i < __num_samples; ++__i)</div>
<div class="line"><a name="l01064"></a><span class="lineno"> 1064</span>  {</div>
<div class="line"><a name="l01065"></a><span class="lineno"> 1065</span>  _DifferenceType sample_index = <span class="keyword">static_cast<</span>_DifferenceType<span class="keyword">></span></div>
<div class="line"><a name="l01066"></a><span class="lineno"> 1066</span>  (<a class="code" href="a01319.html#a2693f6e2ecfb03bdb564ca578f60b085" title="Length of a sequence described by a pair of iterators.">_GLIBCXX_PARALLEL_LENGTH</a>(__seqs_begin[__s])</div>
<div class="line"><a name="l01067"></a><span class="lineno"> 1067</span>  * (double(__i + 1) / (__num_samples + 1))</div>
<div class="line"><a name="l01068"></a><span class="lineno"> 1068</span>  * (double(__length) / __total_length));</div>
<div class="line"><a name="l01069"></a><span class="lineno"> 1069</span>  <span class="keyword">new</span>(&(__samples[__s * __num_samples + __i]))</div>
<div class="line"><a name="l01070"></a><span class="lineno"> 1070</span>  _ValueType(__seqs_begin[__s].first[sample_index]);</div>
<div class="line"><a name="l01071"></a><span class="lineno"> 1071</span>  }</div>
<div class="line"><a name="l01072"></a><span class="lineno"> 1072</span> </div>
<div class="line"><a name="l01073"></a><span class="lineno"> 1073</span>  <span class="comment">// Sort stable or non-stable, depending on value of template parameter</span></div>
<div class="line"><a name="l01074"></a><span class="lineno"> 1074</span>  <span class="comment">// "__stable".</span></div>
<div class="line"><a name="l01075"></a><span class="lineno"> 1075</span>  <a class="code" href="a00161.html" title="Stable sorting functor.">_SamplingSorter<__stable, _ValueType*, _Compare></a>()</div>
<div class="line"><a name="l01076"></a><span class="lineno"> 1076</span>  (__samples, __samples + (__num_samples * __k), __comp);</div>
<div class="line"><a name="l01077"></a><span class="lineno"> 1077</span> </div>
<div class="line"><a name="l01078"></a><span class="lineno"> 1078</span>  <span class="keywordflow">for</span> (<a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a> __slab = 0; __slab < __num_threads; ++__slab)</div>
<div class="line"><a name="l01079"></a><span class="lineno"> 1079</span>  <span class="comment">// For each slab / processor.</span></div>
<div class="line"><a name="l01080"></a><span class="lineno"> 1080</span>  <span class="keywordflow">for</span> (_SeqNumber __seq = 0; __seq < __k; ++__seq)</div>
<div class="line"><a name="l01081"></a><span class="lineno"> 1081</span>  {</div>
<div class="line"><a name="l01082"></a><span class="lineno"> 1082</span>  <span class="comment">// For each sequence.</span></div>
<div class="line"><a name="l01083"></a><span class="lineno"> 1083</span>  <span class="keywordflow">if</span> (__slab > 0)</div>
<div class="line"><a name="l01084"></a><span class="lineno"> 1084</span>  __pieces[__slab][__seq].first = std::upper_bound</div>
<div class="line"><a name="l01085"></a><span class="lineno"> 1085</span>  (__seqs_begin[__seq].first, __seqs_begin[__seq].second,</div>
<div class="line"><a name="l01086"></a><span class="lineno"> 1086</span>  __samples[__num_samples * __k * __slab / __num_threads],</div>
<div class="line"><a name="l01087"></a><span class="lineno"> 1087</span>  __comp)</div>
<div class="line"><a name="l01088"></a><span class="lineno"> 1088</span>  - __seqs_begin[__seq].first;</div>
<div class="line"><a name="l01089"></a><span class="lineno"> 1089</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l01090"></a><span class="lineno"> 1090</span>  <span class="comment">// Absolute beginning.</span></div>
<div class="line"><a name="l01091"></a><span class="lineno"> 1091</span>  __pieces[__slab][__seq].first = 0;</div>
<div class="line"><a name="l01092"></a><span class="lineno"> 1092</span>  <span class="keywordflow">if</span> ((__slab + 1) < __num_threads)</div>
<div class="line"><a name="l01093"></a><span class="lineno"> 1093</span>  __pieces[__slab][__seq].second = std::upper_bound</div>
<div class="line"><a name="l01094"></a><span class="lineno"> 1094</span>  (__seqs_begin[__seq].first, __seqs_begin[__seq].second,</div>
<div class="line"><a name="l01095"></a><span class="lineno"> 1095</span>  __samples[__num_samples * __k * (__slab + 1) / __num_threads],</div>
<div class="line"><a name="l01096"></a><span class="lineno"> 1096</span>  __comp)</div>
<div class="line"><a name="l01097"></a><span class="lineno"> 1097</span>  - __seqs_begin[__seq].first;</div>
<div class="line"><a name="l01098"></a><span class="lineno"> 1098</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l01099"></a><span class="lineno"> 1099</span>  <span class="comment">// Absolute end.</span></div>
<div class="line"><a name="l01100"></a><span class="lineno"> 1100</span>  __pieces[__slab][__seq].second =</div>
<div class="line"><a name="l01101"></a><span class="lineno"> 1101</span>  <a class="code" href="a01319.html#a2693f6e2ecfb03bdb564ca578f60b085" title="Length of a sequence described by a pair of iterators.">_GLIBCXX_PARALLEL_LENGTH</a>(__seqs_begin[__seq]);</div>
<div class="line"><a name="l01102"></a><span class="lineno"> 1102</span>  }</div>
<div class="line"><a name="l01103"></a><span class="lineno"> 1103</span> </div>
<div class="line"><a name="l01104"></a><span class="lineno"> 1104</span>  <span class="keywordflow">for</span> (_SeqNumber __s = 0; __s < __k; ++__s)</div>
<div class="line"><a name="l01105"></a><span class="lineno"> 1105</span>  <span class="keywordflow">for</span> (_DifferenceType __i = 0; __i < __num_samples; ++__i)</div>
<div class="line"><a name="l01106"></a><span class="lineno"> 1106</span>  __samples[__s * __num_samples + __i].~_ValueType();</div>
<div class="line"><a name="l01107"></a><span class="lineno"> 1107</span>  ::operator <span class="keyword">delete</span>(__samples);</div>
<div class="line"><a name="l01108"></a><span class="lineno"> 1108</span>  }</div>
<div class="line"><a name="l01109"></a><span class="lineno"> 1109</span> <span class="comment"></span></div>
<div class="line"><a name="l01110"></a><span class="lineno"> 1110</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l01111"></a><span class="lineno"> 1111</span> <span class="comment"> * @brief Exact splitting for parallel multiway-merge routine.</span></div>
<div class="line"><a name="l01112"></a><span class="lineno"> 1112</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01113"></a><span class="lineno"> 1113</span> <span class="comment"> * None of the passed sequences may be empty.</span></div>
<div class="line"><a name="l01114"></a><span class="lineno"> 1114</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01115"></a><span class="lineno"> 1115</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __stable,</div>
<div class="line"><a name="l01116"></a><span class="lineno"> 1116</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l01117"></a><span class="lineno"> 1117</span>  <span class="keyword">typename</span> _Compare,</div>
<div class="line"><a name="l01118"></a><span class="lineno"> 1118</span>  <span class="keyword">typename</span> _DifferenceType></div>
<div class="line"><a name="l01119"></a><span class="lineno"> 1119</span>  <span class="keywordtype">void</span></div>
<div class="line"><a name="l01120"></a><span class="lineno"><a class="code" href="a01597.html#a567621588e461a8759651e29cd964ab9"> 1120</a></span>  <a class="code" href="a01597.html#a567621588e461a8759651e29cd964ab9" title="Exact splitting for parallel multiway-merge routine.">multiway_merge_exact_splitting</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l01121"></a><span class="lineno"> 1121</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l01122"></a><span class="lineno"> 1122</span>  _DifferenceType __length,</div>
<div class="line"><a name="l01123"></a><span class="lineno"> 1123</span>  _DifferenceType __total_length,</div>
<div class="line"><a name="l01124"></a><span class="lineno"> 1124</span>  _Compare __comp,</div>
<div class="line"><a name="l01125"></a><span class="lineno"> 1125</span>  <a class="code" href="a00957.html" title="A standard container which offers fixed time access to individual elements in any order...">std::vector</a><<a class="code" href="a00460.html" title="Struct holding two objects of arbitrary type.">std::pair<_DifferenceType, _DifferenceType></a> > *__pieces)</div>
<div class="line"><a name="l01126"></a><span class="lineno"> 1126</span>  {</div>
<div class="line"><a name="l01127"></a><span class="lineno"> 1127</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l01128"></a><span class="lineno"> 1128</span>  ::difference_type _SeqNumber;</div>
<div class="line"><a name="l01129"></a><span class="lineno"> 1129</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l01130"></a><span class="lineno"> 1130</span>  ::value_type::first_type</div>
<div class="line"><a name="l01131"></a><span class="lineno"> 1131</span>  _RAIter1;</div>
<div class="line"><a name="l01132"></a><span class="lineno"> 1132</span> </div>
<div class="line"><a name="l01133"></a><span class="lineno"> 1133</span>  <span class="keyword">const</span> <span class="keywordtype">bool</span> __tight = (__total_length == __length);</div>
<div class="line"><a name="l01134"></a><span class="lineno"> 1134</span> </div>
<div class="line"><a name="l01135"></a><span class="lineno"> 1135</span>  <span class="comment">// __k sequences.</span></div>
<div class="line"><a name="l01136"></a><span class="lineno"> 1136</span>  <span class="keyword">const</span> _SeqNumber __k = __seqs_end - __seqs_begin;</div>
<div class="line"><a name="l01137"></a><span class="lineno"> 1137</span> </div>
<div class="line"><a name="l01138"></a><span class="lineno"> 1138</span>  <span class="keyword">const</span> <a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a> __num_threads = omp_get_num_threads();</div>
<div class="line"><a name="l01139"></a><span class="lineno"> 1139</span> </div>
<div class="line"><a name="l01140"></a><span class="lineno"> 1140</span>  <span class="comment">// (Settings::multiway_merge_splitting</span></div>
<div class="line"><a name="l01141"></a><span class="lineno"> 1141</span>  <span class="comment">// == __gnu_parallel::_Settings::EXACT).</span></div>
<div class="line"><a name="l01142"></a><span class="lineno"> 1142</span>  <a class="code" href="a00957.html" title="A standard container which offers fixed time access to individual elements in any order...">std::vector<_RAIter1></a>* __offsets = </div>
<div class="line"><a name="l01143"></a><span class="lineno"> 1143</span>  <span class="keyword">new</span> <a class="code" href="a00957.html" title="A standard container which offers fixed time access to individual elements in any order...">std::vector<_RAIter1></a>[__num_threads];</div>
<div class="line"><a name="l01144"></a><span class="lineno"> 1144</span>  <a class="code" href="a00957.html" title="A standard container which offers fixed time access to individual elements in any order...">std::vector<std::pair<_RAIter1, _RAIter1></a> > __se(__k);</div>
<div class="line"><a name="l01145"></a><span class="lineno"> 1145</span> </div>
<div class="line"><a name="l01146"></a><span class="lineno"> 1146</span>  copy(__seqs_begin, __seqs_end, __se.<a class="code" href="a00957.html#ab389167242d48043ac757e958cca1bbb">begin</a>());</div>
<div class="line"><a name="l01147"></a><span class="lineno"> 1147</span> </div>
<div class="line"><a name="l01148"></a><span class="lineno"> 1148</span>  _DifferenceType* __borders =</div>
<div class="line"><a name="l01149"></a><span class="lineno"> 1149</span>  <span class="keyword">new</span> _DifferenceType[__num_threads + 1];</div>
<div class="line"><a name="l01150"></a><span class="lineno"> 1150</span>  <a class="code" href="a01597.html#ac799255921e70b0378d145924d673f9c" title="function to split a sequence into parts of almost equal size.">__equally_split</a>(__length, __num_threads, __borders);</div>
<div class="line"><a name="l01151"></a><span class="lineno"> 1151</span> </div>
<div class="line"><a name="l01152"></a><span class="lineno"> 1152</span>  <span class="keywordflow">for</span> (<a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a> __s = 0; __s < (__num_threads - 1); ++__s)</div>
<div class="line"><a name="l01153"></a><span class="lineno"> 1153</span>  {</div>
<div class="line"><a name="l01154"></a><span class="lineno"> 1154</span>  __offsets[__s].<a class="code" href="a00957.html#a1134bcc83ff6c70cf78bab3cd426feaf" title="Resizes the vector to the specified number of elements.">resize</a>(__k);</div>
<div class="line"><a name="l01155"></a><span class="lineno"> 1155</span>  <a class="code" href="a01597.html#ade1f4c5da0794c4f1a09465d4aee6c1d" title="Splits several sorted sequences at a certain global __rank, resulting in a splitting point for each s...">multiseq_partition</a>(__se.<a class="code" href="a00957.html#ab389167242d48043ac757e958cca1bbb">begin</a>(), __se.<a class="code" href="a00957.html#ac6c7df2a52257daa285e71cbcf60c259">end</a>(), __borders[__s + 1],</div>
<div class="line"><a name="l01156"></a><span class="lineno"> 1156</span>  __offsets[__s].<a class="code" href="a00957.html#ab389167242d48043ac757e958cca1bbb">begin</a>(), __comp);</div>
<div class="line"><a name="l01157"></a><span class="lineno"> 1157</span> </div>
<div class="line"><a name="l01158"></a><span class="lineno"> 1158</span>  <span class="comment">// Last one also needed and available.</span></div>
<div class="line"><a name="l01159"></a><span class="lineno"> 1159</span>  <span class="keywordflow">if</span> (!__tight)</div>
<div class="line"><a name="l01160"></a><span class="lineno"> 1160</span>  {</div>
<div class="line"><a name="l01161"></a><span class="lineno"> 1161</span>  __offsets[__num_threads - 1].<a class="code" href="a00957.html#a1134bcc83ff6c70cf78bab3cd426feaf" title="Resizes the vector to the specified number of elements.">resize</a>(__k);</div>
<div class="line"><a name="l01162"></a><span class="lineno"> 1162</span>  <a class="code" href="a01597.html#ade1f4c5da0794c4f1a09465d4aee6c1d" title="Splits several sorted sequences at a certain global __rank, resulting in a splitting point for each s...">multiseq_partition</a>(__se.<a class="code" href="a00957.html#ab389167242d48043ac757e958cca1bbb">begin</a>(), __se.<a class="code" href="a00957.html#ac6c7df2a52257daa285e71cbcf60c259">end</a>(),</div>
<div class="line"><a name="l01163"></a><span class="lineno"> 1163</span>  _DifferenceType(__length),</div>
<div class="line"><a name="l01164"></a><span class="lineno"> 1164</span>  __offsets[__num_threads - 1].<a class="code" href="a00957.html#ab389167242d48043ac757e958cca1bbb">begin</a>(),</div>
<div class="line"><a name="l01165"></a><span class="lineno"> 1165</span>  __comp);</div>
<div class="line"><a name="l01166"></a><span class="lineno"> 1166</span>  }</div>
<div class="line"><a name="l01167"></a><span class="lineno"> 1167</span>  }</div>
<div class="line"><a name="l01168"></a><span class="lineno"> 1168</span>  <span class="keyword">delete</span>[] __borders;</div>
<div class="line"><a name="l01169"></a><span class="lineno"> 1169</span> </div>
<div class="line"><a name="l01170"></a><span class="lineno"> 1170</span>  <span class="keywordflow">for</span> (<a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a> __slab = 0; __slab < __num_threads; ++__slab)</div>
<div class="line"><a name="l01171"></a><span class="lineno"> 1171</span>  {</div>
<div class="line"><a name="l01172"></a><span class="lineno"> 1172</span>  <span class="comment">// For each slab / processor.</span></div>
<div class="line"><a name="l01173"></a><span class="lineno"> 1173</span>  <span class="keywordflow">for</span> (_SeqNumber __seq = 0; __seq < __k; ++__seq)</div>
<div class="line"><a name="l01174"></a><span class="lineno"> 1174</span>  {</div>
<div class="line"><a name="l01175"></a><span class="lineno"> 1175</span>  <span class="comment">// For each sequence.</span></div>
<div class="line"><a name="l01176"></a><span class="lineno"> 1176</span>  <span class="keywordflow">if</span> (__slab == 0)</div>
<div class="line"><a name="l01177"></a><span class="lineno"> 1177</span>  {</div>
<div class="line"><a name="l01178"></a><span class="lineno"> 1178</span>  <span class="comment">// Absolute beginning.</span></div>
<div class="line"><a name="l01179"></a><span class="lineno"> 1179</span>  __pieces[__slab][__seq].first = 0;</div>
<div class="line"><a name="l01180"></a><span class="lineno"> 1180</span>  }</div>
<div class="line"><a name="l01181"></a><span class="lineno"> 1181</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l01182"></a><span class="lineno"> 1182</span>  __pieces[__slab][__seq].first =</div>
<div class="line"><a name="l01183"></a><span class="lineno"> 1183</span>  __pieces[__slab - 1][__seq].second;</div>
<div class="line"><a name="l01184"></a><span class="lineno"> 1184</span>  <span class="keywordflow">if</span> (!__tight || __slab < (__num_threads - 1))</div>
<div class="line"><a name="l01185"></a><span class="lineno"> 1185</span>  __pieces[__slab][__seq].second =</div>
<div class="line"><a name="l01186"></a><span class="lineno"> 1186</span>  __offsets[__slab][__seq] - __seqs_begin[__seq].first;</div>
<div class="line"><a name="l01187"></a><span class="lineno"> 1187</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l01188"></a><span class="lineno"> 1188</span>  {</div>
<div class="line"><a name="l01189"></a><span class="lineno"> 1189</span>  <span class="comment">// __slab == __num_threads - 1</span></div>
<div class="line"><a name="l01190"></a><span class="lineno"> 1190</span>  __pieces[__slab][__seq].second =</div>
<div class="line"><a name="l01191"></a><span class="lineno"> 1191</span>  <a class="code" href="a01319.html#a2693f6e2ecfb03bdb564ca578f60b085" title="Length of a sequence described by a pair of iterators.">_GLIBCXX_PARALLEL_LENGTH</a>(__seqs_begin[__seq]);</div>
<div class="line"><a name="l01192"></a><span class="lineno"> 1192</span>  }</div>
<div class="line"><a name="l01193"></a><span class="lineno"> 1193</span>  }</div>
<div class="line"><a name="l01194"></a><span class="lineno"> 1194</span>  }</div>
<div class="line"><a name="l01195"></a><span class="lineno"> 1195</span>  <span class="keyword">delete</span>[] __offsets;</div>
<div class="line"><a name="l01196"></a><span class="lineno"> 1196</span>  }</div>
<div class="line"><a name="l01197"></a><span class="lineno"> 1197</span> <span class="comment"></span></div>
<div class="line"><a name="l01198"></a><span class="lineno"> 1198</span> <span class="comment"> /** @brief Parallel multi-way merge routine.</span></div>
<div class="line"><a name="l01199"></a><span class="lineno"> 1199</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01200"></a><span class="lineno"> 1200</span> <span class="comment"> * The _GLIBCXX_PARALLEL_DECISION is based on the branching factor</span></div>
<div class="line"><a name="l01201"></a><span class="lineno"> 1201</span> <span class="comment"> * and runtime settings.</span></div>
<div class="line"><a name="l01202"></a><span class="lineno"> 1202</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01203"></a><span class="lineno"> 1203</span> <span class="comment"> * Must not be called if the number of sequences is 1.</span></div>
<div class="line"><a name="l01204"></a><span class="lineno"> 1204</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01205"></a><span class="lineno"> 1205</span> <span class="comment"> * @tparam _Splitter functor to split input (either __exact or sampling based)</span></div>
<div class="line"><a name="l01206"></a><span class="lineno"> 1206</span> <span class="comment"> * @tparam __stable Stable merging incurs a performance penalty.</span></div>
<div class="line"><a name="l01207"></a><span class="lineno"> 1207</span> <span class="comment"> * @tparam __sentinel Ignored.</span></div>
<div class="line"><a name="l01208"></a><span class="lineno"> 1208</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01209"></a><span class="lineno"> 1209</span> <span class="comment"> * @param __seqs_begin Begin iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l01210"></a><span class="lineno"> 1210</span> <span class="comment"> * @param __seqs_end End iterator of iterator pair input sequence.</span></div>
<div class="line"><a name="l01211"></a><span class="lineno"> 1211</span> <span class="comment"> * @param __target Begin iterator of output sequence.</span></div>
<div class="line"><a name="l01212"></a><span class="lineno"> 1212</span> <span class="comment"> * @param __comp Comparator.</span></div>
<div class="line"><a name="l01213"></a><span class="lineno"> 1213</span> <span class="comment"> * @param __length Maximum length to merge, possibly larger than the</span></div>
<div class="line"><a name="l01214"></a><span class="lineno"> 1214</span> <span class="comment"> * number of elements available.</span></div>
<div class="line"><a name="l01215"></a><span class="lineno"> 1215</span> <span class="comment"> * @return End iterator of output sequence.</span></div>
<div class="line"><a name="l01216"></a><span class="lineno"> 1216</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01217"></a><span class="lineno"> 1217</span>  <span class="keyword">template</span><<span class="keywordtype">bool</span> __stable,</div>
<div class="line"><a name="l01218"></a><span class="lineno"> 1218</span>  <span class="keywordtype">bool</span> __sentinels,</div>
<div class="line"><a name="l01219"></a><span class="lineno"> 1219</span>  <span class="keyword">typename</span> _RAIterIterator,</div>
<div class="line"><a name="l01220"></a><span class="lineno"> 1220</span>  <span class="keyword">typename</span> _RAIter3,</div>
<div class="line"><a name="l01221"></a><span class="lineno"> 1221</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01222"></a><span class="lineno"> 1222</span>  <span class="keyword">typename</span> _Splitter,</div>
<div class="line"><a name="l01223"></a><span class="lineno"> 1223</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01224"></a><span class="lineno"> 1224</span>  _RAIter3</div>
<div class="line"><a name="l01225"></a><span class="lineno"><a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4"> 1225</a></span>  <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a>(_RAIterIterator __seqs_begin,</div>
<div class="line"><a name="l01226"></a><span class="lineno"> 1226</span>  _RAIterIterator __seqs_end,</div>
<div class="line"><a name="l01227"></a><span class="lineno"> 1227</span>  _RAIter3 __target,</div>
<div class="line"><a name="l01228"></a><span class="lineno"> 1228</span>  _Splitter __splitter,</div>
<div class="line"><a name="l01229"></a><span class="lineno"> 1229</span>  _DifferenceTp __length,</div>
<div class="line"><a name="l01230"></a><span class="lineno"> 1230</span>  _Compare __comp,</div>
<div class="line"><a name="l01231"></a><span class="lineno"> 1231</span>  <a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a> __num_threads)</div>
<div class="line"><a name="l01232"></a><span class="lineno"> 1232</span>  {</div>
<div class="line"><a name="l01233"></a><span class="lineno"> 1233</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l01234"></a><span class="lineno"> 1234</span> <span class="preprocessor"></span> _GLIBCXX_PARALLEL_ASSERT(__seqs_end - __seqs_begin > 1);</div>
<div class="line"><a name="l01235"></a><span class="lineno"> 1235</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01236"></a><span class="lineno"> 1236</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l01237"></a><span class="lineno"> 1237</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__length)</div>
<div class="line"><a name="l01238"></a><span class="lineno"> 1238</span> </div>
<div class="line"><a name="l01239"></a><span class="lineno"> 1239</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01240"></a><span class="lineno"> 1240</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l01241"></a><span class="lineno"> 1241</span>  ::difference_type _SeqNumber;</div>
<div class="line"><a name="l01242"></a><span class="lineno"> 1242</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span> std::iterator_traits<_RAIterIterator></div>
<div class="line"><a name="l01243"></a><span class="lineno"> 1243</span>  ::value_type::first_type</div>
<div class="line"><a name="l01244"></a><span class="lineno"> 1244</span>  _RAIter1;</div>
<div class="line"><a name="l01245"></a><span class="lineno"> 1245</span>  <span class="keyword">typedef</span> <span class="keyword">typename</span></div>
<div class="line"><a name="l01246"></a><span class="lineno"> 1246</span>  std::iterator_traits<_RAIter1>::value_type _ValueType;</div>
<div class="line"><a name="l01247"></a><span class="lineno"> 1247</span> </div>
<div class="line"><a name="l01248"></a><span class="lineno"> 1248</span>  <span class="comment">// Leave only non-empty sequences.</span></div>
<div class="line"><a name="l01249"></a><span class="lineno"> 1249</span>  <span class="keyword">typedef</span> <a class="code" href="a00460.html" title="Struct holding two objects of arbitrary type.">std::pair<_RAIter1, _RAIter1></a> seq_type;</div>
<div class="line"><a name="l01250"></a><span class="lineno"> 1250</span>  seq_type* __ne_seqs = <span class="keyword">new</span> seq_type[__seqs_end - __seqs_begin];</div>
<div class="line"><a name="l01251"></a><span class="lineno"> 1251</span>  _SeqNumber __k = 0;</div>
<div class="line"><a name="l01252"></a><span class="lineno"> 1252</span>  _DifferenceType __total_length = 0;</div>
<div class="line"><a name="l01253"></a><span class="lineno"> 1253</span>  <span class="keywordflow">for</span> (_RAIterIterator __raii = __seqs_begin;</div>
<div class="line"><a name="l01254"></a><span class="lineno"> 1254</span>  __raii != __seqs_end; ++__raii)</div>
<div class="line"><a name="l01255"></a><span class="lineno"> 1255</span>  {</div>
<div class="line"><a name="l01256"></a><span class="lineno"> 1256</span>  _DifferenceTp __seq_length = <a class="code" href="a01319.html#a2693f6e2ecfb03bdb564ca578f60b085" title="Length of a sequence described by a pair of iterators.">_GLIBCXX_PARALLEL_LENGTH</a>(*__raii);</div>
<div class="line"><a name="l01257"></a><span class="lineno"> 1257</span>  <span class="keywordflow">if</span>(__seq_length > 0)</div>
<div class="line"><a name="l01258"></a><span class="lineno"> 1258</span>  {</div>
<div class="line"><a name="l01259"></a><span class="lineno"> 1259</span>  __total_length += __seq_length;</div>
<div class="line"><a name="l01260"></a><span class="lineno"> 1260</span>  __ne_seqs[__k++] = *__raii;</div>
<div class="line"><a name="l01261"></a><span class="lineno"> 1261</span>  }</div>
<div class="line"><a name="l01262"></a><span class="lineno"> 1262</span>  }</div>
<div class="line"><a name="l01263"></a><span class="lineno"> 1263</span> </div>
<div class="line"><a name="l01264"></a><span class="lineno"> 1264</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__total_length)</div>
<div class="line"><a name="l01265"></a><span class="lineno"> 1265</span> </div>
<div class="line"><a name="l01266"></a><span class="lineno"> 1266</span>  __length = std::min<_DifferenceTp>(__length, __total_length);</div>
<div class="line"><a name="l01267"></a><span class="lineno"> 1267</span> </div>
<div class="line"><a name="l01268"></a><span class="lineno"> 1268</span>  <span class="keywordflow">if</span> (__total_length == 0 || __k == 0)</div>
<div class="line"><a name="l01269"></a><span class="lineno"> 1269</span>  {</div>
<div class="line"><a name="l01270"></a><span class="lineno"> 1270</span>  <span class="keyword">delete</span>[] __ne_seqs;</div>
<div class="line"><a name="l01271"></a><span class="lineno"> 1271</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l01272"></a><span class="lineno"> 1272</span>  }</div>
<div class="line"><a name="l01273"></a><span class="lineno"> 1273</span> </div>
<div class="line"><a name="l01274"></a><span class="lineno"> 1274</span>  <a class="code" href="a00957.html" title="A standard container which offers fixed time access to individual elements in any order...">std::vector<std::pair<_DifferenceType, _DifferenceType></a> >* __pieces;</div>
<div class="line"><a name="l01275"></a><span class="lineno"> 1275</span> </div>
<div class="line"><a name="l01276"></a><span class="lineno"> 1276</span>  __num_threads = <span class="keyword">static_cast<</span><a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a><span class="keyword">></span></div>
<div class="line"><a name="l01277"></a><span class="lineno"> 1277</span>  (std::min<_DifferenceType>(__num_threads, __total_length));</div>
<div class="line"><a name="l01278"></a><span class="lineno"> 1278</span> </div>
<div class="line"><a name="l01279"></a><span class="lineno"> 1279</span> <span class="preprocessor"># pragma omp parallel num_threads (__num_threads)</span></div>
<div class="line"><a name="l01280"></a><span class="lineno"> 1280</span> <span class="preprocessor"></span> {</div>
<div class="line"><a name="l01281"></a><span class="lineno"> 1281</span> <span class="preprocessor"># pragma omp single</span></div>
<div class="line"><a name="l01282"></a><span class="lineno"> 1282</span> <span class="preprocessor"></span> {</div>
<div class="line"><a name="l01283"></a><span class="lineno"> 1283</span>  __num_threads = omp_get_num_threads();</div>
<div class="line"><a name="l01284"></a><span class="lineno"> 1284</span>  <span class="comment">// Thread __t will have to merge pieces[__iam][0..__k - 1]</span></div>
<div class="line"><a name="l01285"></a><span class="lineno"> 1285</span>  __pieces = <span class="keyword">new</span> <a class="code" href="a00957.html" title="A standard container which offers fixed time access to individual elements in any order...">std::vector</a><</div>
<div class="line"><a name="l01286"></a><span class="lineno"> 1286</span>  <a class="code" href="a00460.html" title="Struct holding two objects of arbitrary type.">std::pair<_DifferenceType, _DifferenceType></a> >[__num_threads];</div>
<div class="line"><a name="l01287"></a><span class="lineno"> 1287</span>  <span class="keywordflow">for</span> (<a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a> __s = 0; __s < __num_threads; ++__s)</div>
<div class="line"><a name="l01288"></a><span class="lineno"> 1288</span>  __pieces[__s].resize(__k);</div>
<div class="line"><a name="l01289"></a><span class="lineno"> 1289</span> </div>
<div class="line"><a name="l01290"></a><span class="lineno"> 1290</span>  _DifferenceType __num_samples =</div>
<div class="line"><a name="l01291"></a><span class="lineno"> 1291</span>  <a class="code" href="a00163.html#abc4965eacae0b49945ebc887cb11adc1" title="Get the global settings.">__gnu_parallel::_Settings::get</a>().<a class="code" href="a00163.html#a14ded8ea54764e899f1d24ef1fe12b19" title="Oversampling factor for merge.">merge_oversampling</a></div>
<div class="line"><a name="l01292"></a><span class="lineno"> 1292</span>  * __num_threads;</div>
<div class="line"><a name="l01293"></a><span class="lineno"> 1293</span> </div>
<div class="line"><a name="l01294"></a><span class="lineno"> 1294</span>  __splitter(__ne_seqs, __ne_seqs + __k, __length, __total_length,</div>
<div class="line"><a name="l01295"></a><span class="lineno"> 1295</span>  __comp, __pieces);</div>
<div class="line"><a name="l01296"></a><span class="lineno"> 1296</span>  } <span class="comment">//single</span></div>
<div class="line"><a name="l01297"></a><span class="lineno"> 1297</span> </div>
<div class="line"><a name="l01298"></a><span class="lineno"> 1298</span>  <a class="code" href="a01597.html#a05e502e51bfc3233671730f74a44dc6a" title="Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...">_ThreadIndex</a> __iam = omp_get_thread_num();</div>
<div class="line"><a name="l01299"></a><span class="lineno"> 1299</span> </div>
<div class="line"><a name="l01300"></a><span class="lineno"> 1300</span>  _DifferenceType __target_position = 0;</div>
<div class="line"><a name="l01301"></a><span class="lineno"> 1301</span> </div>
<div class="line"><a name="l01302"></a><span class="lineno"> 1302</span>  <span class="keywordflow">for</span> (_SeqNumber __c = 0; __c < __k; ++__c)</div>
<div class="line"><a name="l01303"></a><span class="lineno"> 1303</span>  __target_position += __pieces[__iam][__c].first;</div>
<div class="line"><a name="l01304"></a><span class="lineno"> 1304</span> </div>
<div class="line"><a name="l01305"></a><span class="lineno"> 1305</span>  seq_type* __chunks = <span class="keyword">new</span> seq_type[__k];</div>
<div class="line"><a name="l01306"></a><span class="lineno"> 1306</span> </div>
<div class="line"><a name="l01307"></a><span class="lineno"> 1307</span>  <span class="keywordflow">for</span> (_SeqNumber __s = 0; __s < __k; ++__s)</div>
<div class="line"><a name="l01308"></a><span class="lineno"> 1308</span>  __chunks[__s] = <a class="code" href="a01604.html#a0409e288f07b697cb6885d1002df0bd6" title="A convenience wrapper for creating a pair from two objects.">std::make_pair</a>(__ne_seqs[__s].first</div>
<div class="line"><a name="l01309"></a><span class="lineno"> 1309</span>  + __pieces[__iam][__s].first,</div>
<div class="line"><a name="l01310"></a><span class="lineno"> 1310</span>  __ne_seqs[__s].first</div>
<div class="line"><a name="l01311"></a><span class="lineno"> 1311</span>  + __pieces[__iam][__s].second);</div>
<div class="line"><a name="l01312"></a><span class="lineno"> 1312</span> </div>
<div class="line"><a name="l01313"></a><span class="lineno"> 1313</span>  <span class="keywordflow">if</span>(__length > __target_position)</div>
<div class="line"><a name="l01314"></a><span class="lineno"> 1314</span>  __sequential_multiway_merge<__stable, __sentinels></div>
<div class="line"><a name="l01315"></a><span class="lineno"> 1315</span>  (__chunks, __chunks + __k, __target + __target_position,</div>
<div class="line"><a name="l01316"></a><span class="lineno"> 1316</span>  *(__seqs_begin->second), __length - __target_position, __comp);</div>
<div class="line"><a name="l01317"></a><span class="lineno"> 1317</span> </div>
<div class="line"><a name="l01318"></a><span class="lineno"> 1318</span>  <span class="keyword">delete</span>[] __chunks;</div>
<div class="line"><a name="l01319"></a><span class="lineno"> 1319</span>  } <span class="comment">// parallel</span></div>
<div class="line"><a name="l01320"></a><span class="lineno"> 1320</span> </div>
<div class="line"><a name="l01321"></a><span class="lineno"> 1321</span> <span class="preprocessor">#if _GLIBCXX_ASSERTIONS</span></div>
<div class="line"><a name="l01322"></a><span class="lineno"> 1322</span> <span class="preprocessor"></span> _GLIBCXX_PARALLEL_ASSERT(</div>
<div class="line"><a name="l01323"></a><span class="lineno"> 1323</span>  <a class="code" href="a01597.html#a34e76513fa46ae5c7bc8c45677289112" title="Check whether [__begin, __end) is sorted according to __comp.">__is_sorted</a>(__target, __target + __length, __comp));</div>
<div class="line"><a name="l01324"></a><span class="lineno"> 1324</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01325"></a><span class="lineno"> 1325</span> <span class="preprocessor"></span></div>
<div class="line"><a name="l01326"></a><span class="lineno"> 1326</span>  __k = 0;</div>
<div class="line"><a name="l01327"></a><span class="lineno"> 1327</span>  <span class="comment">// Update ends of sequences.</span></div>
<div class="line"><a name="l01328"></a><span class="lineno"> 1328</span>  <span class="keywordflow">for</span> (_RAIterIterator __raii = __seqs_begin;</div>
<div class="line"><a name="l01329"></a><span class="lineno"> 1329</span>  __raii != __seqs_end; ++__raii)</div>
<div class="line"><a name="l01330"></a><span class="lineno"> 1330</span>  {</div>
<div class="line"><a name="l01331"></a><span class="lineno"> 1331</span>  _DifferenceTp __length = <a class="code" href="a01319.html#a2693f6e2ecfb03bdb564ca578f60b085" title="Length of a sequence described by a pair of iterators.">_GLIBCXX_PARALLEL_LENGTH</a>(*__raii);</div>
<div class="line"><a name="l01332"></a><span class="lineno"> 1332</span>  <span class="keywordflow">if</span>(__length > 0)</div>
<div class="line"><a name="l01333"></a><span class="lineno"> 1333</span>  (*__raii).first += __pieces[__num_threads - 1][__k++].second;</div>
<div class="line"><a name="l01334"></a><span class="lineno"> 1334</span>  }</div>
<div class="line"><a name="l01335"></a><span class="lineno"> 1335</span> </div>
<div class="line"><a name="l01336"></a><span class="lineno"> 1336</span>  <span class="keyword">delete</span>[] __pieces;</div>
<div class="line"><a name="l01337"></a><span class="lineno"> 1337</span>  <span class="keyword">delete</span>[] __ne_seqs;</div>
<div class="line"><a name="l01338"></a><span class="lineno"> 1338</span> </div>
<div class="line"><a name="l01339"></a><span class="lineno"> 1339</span>  <span class="keywordflow">return</span> __target + __length;</div>
<div class="line"><a name="l01340"></a><span class="lineno"> 1340</span>  }</div>
<div class="line"><a name="l01341"></a><span class="lineno"> 1341</span> <span class="comment"></span></div>
<div class="line"><a name="l01342"></a><span class="lineno"> 1342</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l01343"></a><span class="lineno"> 1343</span> <span class="comment"> * @brief Multiway Merge Frontend.</span></div>
<div class="line"><a name="l01344"></a><span class="lineno"> 1344</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01345"></a><span class="lineno"> 1345</span> <span class="comment"> * Merge the sequences specified by seqs_begin and __seqs_end into</span></div>
<div class="line"><a name="l01346"></a><span class="lineno"> 1346</span> <span class="comment"> * __target. __seqs_begin and __seqs_end must point to a sequence of</span></div>
<div class="line"><a name="l01347"></a><span class="lineno"> 1347</span> <span class="comment"> * pairs. These pairs must contain an iterator to the beginning</span></div>
<div class="line"><a name="l01348"></a><span class="lineno"> 1348</span> <span class="comment"> * of a sequence in their first entry and an iterator the _M_end of</span></div>
<div class="line"><a name="l01349"></a><span class="lineno"> 1349</span> <span class="comment"> * the same sequence in their second entry.</span></div>
<div class="line"><a name="l01350"></a><span class="lineno"> 1350</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01351"></a><span class="lineno"> 1351</span> <span class="comment"> * Ties are broken arbitrarily. See stable_multiway_merge for a variant</span></div>
<div class="line"><a name="l01352"></a><span class="lineno"> 1352</span> <span class="comment"> * that breaks ties by sequence number but is slower.</span></div>
<div class="line"><a name="l01353"></a><span class="lineno"> 1353</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01354"></a><span class="lineno"> 1354</span> <span class="comment"> * The first entries of the pairs (i.e. the begin iterators) will be moved</span></div>
<div class="line"><a name="l01355"></a><span class="lineno"> 1355</span> <span class="comment"> * forward.</span></div>
<div class="line"><a name="l01356"></a><span class="lineno"> 1356</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01357"></a><span class="lineno"> 1357</span> <span class="comment"> * The output sequence has to provide enough space for all elements</span></div>
<div class="line"><a name="l01358"></a><span class="lineno"> 1358</span> <span class="comment"> * that are written to it.</span></div>
<div class="line"><a name="l01359"></a><span class="lineno"> 1359</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01360"></a><span class="lineno"> 1360</span> <span class="comment"> * This function will merge the input sequences:</span></div>
<div class="line"><a name="l01361"></a><span class="lineno"> 1361</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01362"></a><span class="lineno"> 1362</span> <span class="comment"> * - not stable</span></div>
<div class="line"><a name="l01363"></a><span class="lineno"> 1363</span> <span class="comment"> * - parallel, depending on the input size and Settings</span></div>
<div class="line"><a name="l01364"></a><span class="lineno"> 1364</span> <span class="comment"> * - using sampling for splitting</span></div>
<div class="line"><a name="l01365"></a><span class="lineno"> 1365</span> <span class="comment"> * - not using sentinels</span></div>
<div class="line"><a name="l01366"></a><span class="lineno"> 1366</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01367"></a><span class="lineno"> 1367</span> <span class="comment"> * Example:</span></div>
<div class="line"><a name="l01368"></a><span class="lineno"> 1368</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01369"></a><span class="lineno"> 1369</span> <span class="comment"> * <pre></span></div>
<div class="line"><a name="l01370"></a><span class="lineno"> 1370</span> <span class="comment"> * int sequences[10][10];</span></div>
<div class="line"><a name="l01371"></a><span class="lineno"> 1371</span> <span class="comment"> * for (int __i = 0; __i < 10; ++__i)</span></div>
<div class="line"><a name="l01372"></a><span class="lineno"> 1372</span> <span class="comment"> * for (int __j = 0; __i < 10; ++__j)</span></div>
<div class="line"><a name="l01373"></a><span class="lineno"> 1373</span> <span class="comment"> * sequences[__i][__j] = __j;</span></div>
<div class="line"><a name="l01374"></a><span class="lineno"> 1374</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01375"></a><span class="lineno"> 1375</span> <span class="comment"> * int __out[33];</span></div>
<div class="line"><a name="l01376"></a><span class="lineno"> 1376</span> <span class="comment"> * std::vector<std::pair<int*> > seqs;</span></div>
<div class="line"><a name="l01377"></a><span class="lineno"> 1377</span> <span class="comment"> * for (int __i = 0; __i < 10; ++__i)</span></div>
<div class="line"><a name="l01378"></a><span class="lineno"> 1378</span> <span class="comment"> * { seqs.push(std::make_pair<int*>(sequences[__i],</span></div>
<div class="line"><a name="l01379"></a><span class="lineno"> 1379</span> <span class="comment"> * sequences[__i] + 10)) }</span></div>
<div class="line"><a name="l01380"></a><span class="lineno"> 1380</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01381"></a><span class="lineno"> 1381</span> <span class="comment"> * multiway_merge(seqs.begin(), seqs.end(), __target, std::less<int>(), 33);</span></div>
<div class="line"><a name="l01382"></a><span class="lineno"> 1382</span> <span class="comment"> * </pre></span></div>
<div class="line"><a name="l01383"></a><span class="lineno"> 1383</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01384"></a><span class="lineno"> 1384</span> <span class="comment"> * @see stable_multiway_merge</span></div>
<div class="line"><a name="l01385"></a><span class="lineno"> 1385</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01386"></a><span class="lineno"> 1386</span> <span class="comment"> * @pre All input sequences must be sorted.</span></div>
<div class="line"><a name="l01387"></a><span class="lineno"> 1387</span> <span class="comment"> * @pre Target must provide enough space to merge out length elements or</span></div>
<div class="line"><a name="l01388"></a><span class="lineno"> 1388</span> <span class="comment"> * the number of elements in all sequences, whichever is smaller.</span></div>
<div class="line"><a name="l01389"></a><span class="lineno"> 1389</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01390"></a><span class="lineno"> 1390</span> <span class="comment"> * @post [__target, return __value) contains merged __elements from the</span></div>
<div class="line"><a name="l01391"></a><span class="lineno"> 1391</span> <span class="comment"> * input sequences.</span></div>
<div class="line"><a name="l01392"></a><span class="lineno"> 1392</span> <span class="comment"> * @post return __value - __target = min(__length, number of elements in all</span></div>
<div class="line"><a name="l01393"></a><span class="lineno"> 1393</span> <span class="comment"> * sequences).</span></div>
<div class="line"><a name="l01394"></a><span class="lineno"> 1394</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01395"></a><span class="lineno"> 1395</span> <span class="comment"> * @tparam _RAIterPairIterator iterator over sequence</span></div>
<div class="line"><a name="l01396"></a><span class="lineno"> 1396</span> <span class="comment"> * of pairs of iterators</span></div>
<div class="line"><a name="l01397"></a><span class="lineno"> 1397</span> <span class="comment"> * @tparam _RAIterOut iterator over target sequence</span></div>
<div class="line"><a name="l01398"></a><span class="lineno"> 1398</span> <span class="comment"> * @tparam _DifferenceTp difference type for the sequence</span></div>
<div class="line"><a name="l01399"></a><span class="lineno"> 1399</span> <span class="comment"> * @tparam _Compare strict weak ordering type to compare elements</span></div>
<div class="line"><a name="l01400"></a><span class="lineno"> 1400</span> <span class="comment"> * in sequences</span></div>
<div class="line"><a name="l01401"></a><span class="lineno"> 1401</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01402"></a><span class="lineno"> 1402</span> <span class="comment"> * @param __seqs_begin __begin of sequence __sequence</span></div>
<div class="line"><a name="l01403"></a><span class="lineno"> 1403</span> <span class="comment"> * @param __seqs_end _M_end of sequence __sequence</span></div>
<div class="line"><a name="l01404"></a><span class="lineno"> 1404</span> <span class="comment"> * @param __target target sequence to merge to.</span></div>
<div class="line"><a name="l01405"></a><span class="lineno"> 1405</span> <span class="comment"> * @param __comp strict weak ordering to use for element comparison.</span></div>
<div class="line"><a name="l01406"></a><span class="lineno"> 1406</span> <span class="comment"> * @param __length Maximum length to merge, possibly larger than the</span></div>
<div class="line"><a name="l01407"></a><span class="lineno"> 1407</span> <span class="comment"> * number of elements available.</span></div>
<div class="line"><a name="l01408"></a><span class="lineno"> 1408</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01409"></a><span class="lineno"> 1409</span> <span class="comment"> * @return _M_end iterator of output sequence</span></div>
<div class="line"><a name="l01410"></a><span class="lineno"> 1410</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01411"></a><span class="lineno"> 1411</span>  <span class="comment">// multiway_merge</span></div>
<div class="line"><a name="l01412"></a><span class="lineno"> 1412</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01413"></a><span class="lineno"> 1413</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01414"></a><span class="lineno"> 1414</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01415"></a><span class="lineno"> 1415</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01416"></a><span class="lineno"> 1416</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01417"></a><span class="lineno"> 1417</span>  _RAIterOut</div>
<div class="line"><a name="l01418"></a><span class="lineno"><a class="code" href="a01597.html#a25294b0a47406aefa9ebc5e0c151d0ce"> 1418</a></span>  <a class="code" href="a01597.html#a25294b0a47406aefa9ebc5e0c151d0ce" title="Multiway Merge Frontend.">multiway_merge</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01419"></a><span class="lineno"> 1419</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01420"></a><span class="lineno"> 1420</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01421"></a><span class="lineno"> 1421</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01422"></a><span class="lineno"> 1422</span>  <a class="code" href="a00183.html" title="Forces sequential execution at compile time.">__gnu_parallel::sequential_tag</a>)</div>
<div class="line"><a name="l01423"></a><span class="lineno"> 1423</span>  {</div>
<div class="line"><a name="l01424"></a><span class="lineno"> 1424</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01425"></a><span class="lineno"> 1425</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01426"></a><span class="lineno"> 1426</span> </div>
<div class="line"><a name="l01427"></a><span class="lineno"> 1427</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01428"></a><span class="lineno"> 1428</span>  <span class="keywordflow">if</span> (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01429"></a><span class="lineno"> 1429</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l01430"></a><span class="lineno"> 1430</span> </div>
<div class="line"><a name="l01431"></a><span class="lineno"> 1431</span>  <span class="comment">// Execute multiway merge *sequentially*.</span></div>
<div class="line"><a name="l01432"></a><span class="lineno"> 1432</span>  <span class="keywordflow">return</span> <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01433"></a><span class="lineno"> 1433</span>  <<span class="comment">/* __stable = */</span> <span class="keyword">false</span>, <span class="comment">/* __sentinels = */</span> <span class="keyword">false</span>></div>
<div class="line"><a name="l01434"></a><span class="lineno"> 1434</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01435"></a><span class="lineno"> 1435</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01436"></a><span class="lineno"> 1436</span>  }</div>
<div class="line"><a name="l01437"></a><span class="lineno"> 1437</span> </div>
<div class="line"><a name="l01438"></a><span class="lineno"> 1438</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01439"></a><span class="lineno"> 1439</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01440"></a><span class="lineno"> 1440</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01441"></a><span class="lineno"> 1441</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01442"></a><span class="lineno"> 1442</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01443"></a><span class="lineno"> 1443</span>  _RAIterOut</div>
<div class="line"><a name="l01444"></a><span class="lineno"> 1444</span>  <a class="code" href="a01597.html#a25294b0a47406aefa9ebc5e0c151d0ce" title="Multiway Merge Frontend.">multiway_merge</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01445"></a><span class="lineno"> 1445</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01446"></a><span class="lineno"> 1446</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01447"></a><span class="lineno"> 1447</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01448"></a><span class="lineno"> 1448</span>  <a class="code" href="a00172.html" title="Forces parallel merging with exact splitting, at compile time.">__gnu_parallel::exact_tag</a> __tag)</div>
<div class="line"><a name="l01449"></a><span class="lineno"> 1449</span>  {</div>
<div class="line"><a name="l01450"></a><span class="lineno"> 1450</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01451"></a><span class="lineno"> 1451</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01452"></a><span class="lineno"> 1452</span> </div>
<div class="line"><a name="l01453"></a><span class="lineno"> 1453</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01454"></a><span class="lineno"> 1454</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01455"></a><span class="lineno"> 1455</span>  return __target;</div>
<div class="line"><a name="l01456"></a><span class="lineno"> 1456</span> </div>
<div class="line"><a name="l01457"></a><span class="lineno"> 1457</span>  <span class="comment">// Execute merge; maybe parallel, depending on the number of merged</span></div>
<div class="line"><a name="l01458"></a><span class="lineno"> 1458</span>  <span class="comment">// elements and the number of sequences and global thresholds in</span></div>
<div class="line"><a name="l01459"></a><span class="lineno"> 1459</span>  <span class="comment">// Settings.</span></div>
<div class="line"><a name="l01460"></a><span class="lineno"> 1460</span>  if ((__seqs_end - __seqs_begin > 1)</div>
<div class="line"><a name="l01461"></a><span class="lineno"> 1461</span>  && <a class="code" href="a01459.html#ad816e8f52b933c9300598977cada7d18" title="Determine at compile(?)-time if the parallel variant of an algorithm should be called.">_GLIBCXX_PARALLEL_CONDITION</a>(</div>
<div class="line"><a name="l01462"></a><span class="lineno"> 1462</span>  ((__seqs_end - __seqs_begin) >=</div>
<div class="line"><a name="l01463"></a><span class="lineno"> 1463</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_k)</div>
<div class="line"><a name="l01464"></a><span class="lineno"> 1464</span>  && ((<a class="code" href="a01597.html#a1cbb61a4863a306daa23823d89f9bef1" title="Unsigned integer to index __elements. The total number of elements for each algorithm must fit into t...">_SequenceIndex</a>)__length >=</div>
<div class="line"><a name="l01465"></a><span class="lineno"> 1465</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_n)))</div>
<div class="line"><a name="l01466"></a><span class="lineno"> 1466</span>  return <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a></div>
<div class="line"><a name="l01467"></a><span class="lineno"> 1467</span>  <<span class="comment">/* __stable = */</span> false, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01468"></a><span class="lineno"> 1468</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01469"></a><span class="lineno"> 1469</span>  <a class="code" href="a01597.html#a567621588e461a8759651e29cd964ab9" title="Exact splitting for parallel multiway-merge routine.">multiway_merge_exact_splitting</a><<span class="comment">/* __stable = */</span> false,</div>
<div class="line"><a name="l01470"></a><span class="lineno"> 1470</span>  typename std::iterator_traits<_RAIterPairIterator></div>
<div class="line"><a name="l01471"></a><span class="lineno"> 1471</span>  ::value_type*, _Compare, _DifferenceTp>,</div>
<div class="line"><a name="l01472"></a><span class="lineno"> 1472</span>  static_cast<_DifferenceType>(__length), __comp,</div>
<div class="line"><a name="l01473"></a><span class="lineno"> 1473</span>  __tag.__get_num_threads());</div>
<div class="line"><a name="l01474"></a><span class="lineno"> 1474</span>  else</div>
<div class="line"><a name="l01475"></a><span class="lineno"> 1475</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01476"></a><span class="lineno"> 1476</span>  <<span class="comment">/* __stable = */</span> false, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01477"></a><span class="lineno"> 1477</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01478"></a><span class="lineno"> 1478</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01479"></a><span class="lineno"> 1479</span>  }</div>
<div class="line"><a name="l01480"></a><span class="lineno"> 1480</span> </div>
<div class="line"><a name="l01481"></a><span class="lineno"> 1481</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01482"></a><span class="lineno"> 1482</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01483"></a><span class="lineno"> 1483</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01484"></a><span class="lineno"> 1484</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01485"></a><span class="lineno"> 1485</span>  typename _Compare></div>
<div class="line"><a name="l01486"></a><span class="lineno"> 1486</span>  _RAIterOut</div>
<div class="line"><a name="l01487"></a><span class="lineno"> 1487</span>  <a class="code" href="a01597.html#a25294b0a47406aefa9ebc5e0c151d0ce" title="Multiway Merge Frontend.">multiway_merge</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01488"></a><span class="lineno"> 1488</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01489"></a><span class="lineno"> 1489</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01490"></a><span class="lineno"> 1490</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01491"></a><span class="lineno"> 1491</span>  __gnu_parallel::sampling_tag __tag)</div>
<div class="line"><a name="l01492"></a><span class="lineno"> 1492</span>  {</div>
<div class="line"><a name="l01493"></a><span class="lineno"> 1493</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01494"></a><span class="lineno"> 1494</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01495"></a><span class="lineno"> 1495</span> </div>
<div class="line"><a name="l01496"></a><span class="lineno"> 1496</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01497"></a><span class="lineno"> 1497</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01498"></a><span class="lineno"> 1498</span>  return __target;</div>
<div class="line"><a name="l01499"></a><span class="lineno"> 1499</span> </div>
<div class="line"><a name="l01500"></a><span class="lineno"> 1500</span>  <span class="comment">// Execute merge; maybe parallel, depending on the number of merged</span></div>
<div class="line"><a name="l01501"></a><span class="lineno"> 1501</span>  <span class="comment">// elements and the number of sequences and global thresholds in</span></div>
<div class="line"><a name="l01502"></a><span class="lineno"> 1502</span>  <span class="comment">// Settings.</span></div>
<div class="line"><a name="l01503"></a><span class="lineno"> 1503</span>  if ((__seqs_end - __seqs_begin > 1)</div>
<div class="line"><a name="l01504"></a><span class="lineno"> 1504</span>  && <a class="code" href="a01459.html#ad816e8f52b933c9300598977cada7d18" title="Determine at compile(?)-time if the parallel variant of an algorithm should be called.">_GLIBCXX_PARALLEL_CONDITION</a>(</div>
<div class="line"><a name="l01505"></a><span class="lineno"> 1505</span>  ((__seqs_end - __seqs_begin) >=</div>
<div class="line"><a name="l01506"></a><span class="lineno"> 1506</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_k)</div>
<div class="line"><a name="l01507"></a><span class="lineno"> 1507</span>  && ((<a class="code" href="a01597.html#a1cbb61a4863a306daa23823d89f9bef1" title="Unsigned integer to index __elements. The total number of elements for each algorithm must fit into t...">_SequenceIndex</a>)__length >=</div>
<div class="line"><a name="l01508"></a><span class="lineno"> 1508</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_n)))</div>
<div class="line"><a name="l01509"></a><span class="lineno"> 1509</span>  return <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a></div>
<div class="line"><a name="l01510"></a><span class="lineno"> 1510</span>  <<span class="comment">/* __stable = */</span> false, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01511"></a><span class="lineno"> 1511</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01512"></a><span class="lineno"> 1512</span>  <a class="code" href="a01597.html#a567621588e461a8759651e29cd964ab9" title="Exact splitting for parallel multiway-merge routine.">multiway_merge_exact_splitting</a><<span class="comment">/* __stable = */</span> false,</div>
<div class="line"><a name="l01513"></a><span class="lineno"> 1513</span>  typename std::iterator_traits<_RAIterPairIterator></div>
<div class="line"><a name="l01514"></a><span class="lineno"> 1514</span>  ::value_type*, _Compare, _DifferenceTp>,</div>
<div class="line"><a name="l01515"></a><span class="lineno"> 1515</span>  static_cast<_DifferenceType>(__length), __comp,</div>
<div class="line"><a name="l01516"></a><span class="lineno"> 1516</span>  __tag.__get_num_threads());</div>
<div class="line"><a name="l01517"></a><span class="lineno"> 1517</span>  else</div>
<div class="line"><a name="l01518"></a><span class="lineno"> 1518</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01519"></a><span class="lineno"> 1519</span>  <<span class="comment">/* __stable = */</span> false, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01520"></a><span class="lineno"> 1520</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01521"></a><span class="lineno"> 1521</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01522"></a><span class="lineno"> 1522</span>  }</div>
<div class="line"><a name="l01523"></a><span class="lineno"> 1523</span> </div>
<div class="line"><a name="l01524"></a><span class="lineno"> 1524</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01525"></a><span class="lineno"> 1525</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01526"></a><span class="lineno"> 1526</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01527"></a><span class="lineno"> 1527</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01528"></a><span class="lineno"> 1528</span>  typename _Compare></div>
<div class="line"><a name="l01529"></a><span class="lineno"> 1529</span>  _RAIterOut</div>
<div class="line"><a name="l01530"></a><span class="lineno"> 1530</span>  <a class="code" href="a01597.html#a25294b0a47406aefa9ebc5e0c151d0ce" title="Multiway Merge Frontend.">multiway_merge</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01531"></a><span class="lineno"> 1531</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01532"></a><span class="lineno"> 1532</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01533"></a><span class="lineno"> 1533</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01534"></a><span class="lineno"> 1534</span>  parallel_tag __tag = parallel_tag(0))</div>
<div class="line"><a name="l01535"></a><span class="lineno"> 1535</span>  { <span class="keywordflow">return</span> <a class="code" href="a01597.html#a25294b0a47406aefa9ebc5e0c151d0ce" title="Multiway Merge Frontend.">multiway_merge</a>(__seqs_begin, __seqs_end, __target, __length,</div>
<div class="line"><a name="l01536"></a><span class="lineno"> 1536</span>  __comp, exact_tag(__tag.__get_num_threads())); }</div>
<div class="line"><a name="l01537"></a><span class="lineno"> 1537</span> </div>
<div class="line"><a name="l01538"></a><span class="lineno"> 1538</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01539"></a><span class="lineno"> 1539</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01540"></a><span class="lineno"> 1540</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01541"></a><span class="lineno"> 1541</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01542"></a><span class="lineno"> 1542</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01543"></a><span class="lineno"> 1543</span>  _RAIterOut</div>
<div class="line"><a name="l01544"></a><span class="lineno"> 1544</span>  <a class="code" href="a01597.html#a25294b0a47406aefa9ebc5e0c151d0ce" title="Multiway Merge Frontend.">multiway_merge</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01545"></a><span class="lineno"> 1545</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01546"></a><span class="lineno"> 1546</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01547"></a><span class="lineno"> 1547</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01548"></a><span class="lineno"> 1548</span>  default_parallel_tag __tag)</div>
<div class="line"><a name="l01549"></a><span class="lineno"> 1549</span>  { <span class="keywordflow">return</span> <a class="code" href="a01597.html#a25294b0a47406aefa9ebc5e0c151d0ce" title="Multiway Merge Frontend.">multiway_merge</a>(__seqs_begin, __seqs_end, __target, __length,</div>
<div class="line"><a name="l01550"></a><span class="lineno"> 1550</span>  __comp, exact_tag(__tag.__get_num_threads())); }</div>
<div class="line"><a name="l01551"></a><span class="lineno"> 1551</span> </div>
<div class="line"><a name="l01552"></a><span class="lineno"> 1552</span>  <span class="comment">// stable_multiway_merge</span></div>
<div class="line"><a name="l01553"></a><span class="lineno"> 1553</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01554"></a><span class="lineno"> 1554</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01555"></a><span class="lineno"> 1555</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01556"></a><span class="lineno"> 1556</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01557"></a><span class="lineno"> 1557</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01558"></a><span class="lineno"> 1558</span>  _RAIterOut</div>
<div class="line"><a name="l01559"></a><span class="lineno"> 1559</span>  stable_multiway_merge(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01560"></a><span class="lineno"> 1560</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01561"></a><span class="lineno"> 1561</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01562"></a><span class="lineno"> 1562</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01563"></a><span class="lineno"> 1563</span>  <a class="code" href="a00183.html" title="Forces sequential execution at compile time.">__gnu_parallel::sequential_tag</a>)</div>
<div class="line"><a name="l01564"></a><span class="lineno"> 1564</span>  {</div>
<div class="line"><a name="l01565"></a><span class="lineno"> 1565</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01566"></a><span class="lineno"> 1566</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01567"></a><span class="lineno"> 1567</span> </div>
<div class="line"><a name="l01568"></a><span class="lineno"> 1568</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01569"></a><span class="lineno"> 1569</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01570"></a><span class="lineno"> 1570</span>  return __target;</div>
<div class="line"><a name="l01571"></a><span class="lineno"> 1571</span> </div>
<div class="line"><a name="l01572"></a><span class="lineno"> 1572</span>  <span class="comment">// Execute multiway merge *sequentially*.</span></div>
<div class="line"><a name="l01573"></a><span class="lineno"> 1573</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01574"></a><span class="lineno"> 1574</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01575"></a><span class="lineno"> 1575</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01576"></a><span class="lineno"> 1576</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01577"></a><span class="lineno"> 1577</span>  }</div>
<div class="line"><a name="l01578"></a><span class="lineno"> 1578</span> </div>
<div class="line"><a name="l01579"></a><span class="lineno"> 1579</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01580"></a><span class="lineno"> 1580</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01581"></a><span class="lineno"> 1581</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01582"></a><span class="lineno"> 1582</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01583"></a><span class="lineno"> 1583</span>  typename _Compare></div>
<div class="line"><a name="l01584"></a><span class="lineno"> 1584</span>  _RAIterOut</div>
<div class="line"><a name="l01585"></a><span class="lineno"> 1585</span>  stable_multiway_merge(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01586"></a><span class="lineno"> 1586</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01587"></a><span class="lineno"> 1587</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01588"></a><span class="lineno"> 1588</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01589"></a><span class="lineno"> 1589</span>  __gnu_parallel::exact_tag __tag)</div>
<div class="line"><a name="l01590"></a><span class="lineno"> 1590</span>  {</div>
<div class="line"><a name="l01591"></a><span class="lineno"> 1591</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01592"></a><span class="lineno"> 1592</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01593"></a><span class="lineno"> 1593</span> </div>
<div class="line"><a name="l01594"></a><span class="lineno"> 1594</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01595"></a><span class="lineno"> 1595</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01596"></a><span class="lineno"> 1596</span>  return __target;</div>
<div class="line"><a name="l01597"></a><span class="lineno"> 1597</span> </div>
<div class="line"><a name="l01598"></a><span class="lineno"> 1598</span>  <span class="comment">// Execute merge; maybe parallel, depending on the number of merged</span></div>
<div class="line"><a name="l01599"></a><span class="lineno"> 1599</span>  <span class="comment">// elements and the number of sequences and global thresholds in</span></div>
<div class="line"><a name="l01600"></a><span class="lineno"> 1600</span>  <span class="comment">// Settings.</span></div>
<div class="line"><a name="l01601"></a><span class="lineno"> 1601</span>  if ((__seqs_end - __seqs_begin > 1)</div>
<div class="line"><a name="l01602"></a><span class="lineno"> 1602</span>  && <a class="code" href="a01459.html#ad816e8f52b933c9300598977cada7d18" title="Determine at compile(?)-time if the parallel variant of an algorithm should be called.">_GLIBCXX_PARALLEL_CONDITION</a>(</div>
<div class="line"><a name="l01603"></a><span class="lineno"> 1603</span>  ((__seqs_end - __seqs_begin) >=</div>
<div class="line"><a name="l01604"></a><span class="lineno"> 1604</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_k)</div>
<div class="line"><a name="l01605"></a><span class="lineno"> 1605</span>  && ((<a class="code" href="a01597.html#a1cbb61a4863a306daa23823d89f9bef1" title="Unsigned integer to index __elements. The total number of elements for each algorithm must fit into t...">_SequenceIndex</a>)__length >=</div>
<div class="line"><a name="l01606"></a><span class="lineno"> 1606</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_n)))</div>
<div class="line"><a name="l01607"></a><span class="lineno"> 1607</span>  return <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a></div>
<div class="line"><a name="l01608"></a><span class="lineno"> 1608</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01609"></a><span class="lineno"> 1609</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01610"></a><span class="lineno"> 1610</span>  <a class="code" href="a01597.html#a567621588e461a8759651e29cd964ab9" title="Exact splitting for parallel multiway-merge routine.">multiway_merge_exact_splitting</a><<span class="comment">/* __stable = */</span> true,</div>
<div class="line"><a name="l01611"></a><span class="lineno"> 1611</span>  typename std::iterator_traits<_RAIterPairIterator></div>
<div class="line"><a name="l01612"></a><span class="lineno"> 1612</span>  ::value_type*, _Compare, _DifferenceTp>,</div>
<div class="line"><a name="l01613"></a><span class="lineno"> 1613</span>  static_cast<_DifferenceType>(__length), __comp,</div>
<div class="line"><a name="l01614"></a><span class="lineno"> 1614</span>  __tag.__get_num_threads());</div>
<div class="line"><a name="l01615"></a><span class="lineno"> 1615</span>  else</div>
<div class="line"><a name="l01616"></a><span class="lineno"> 1616</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01617"></a><span class="lineno"> 1617</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01618"></a><span class="lineno"> 1618</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01619"></a><span class="lineno"> 1619</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01620"></a><span class="lineno"> 1620</span>  }</div>
<div class="line"><a name="l01621"></a><span class="lineno"> 1621</span> </div>
<div class="line"><a name="l01622"></a><span class="lineno"> 1622</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01623"></a><span class="lineno"> 1623</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01624"></a><span class="lineno"> 1624</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01625"></a><span class="lineno"> 1625</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01626"></a><span class="lineno"> 1626</span>  typename _Compare></div>
<div class="line"><a name="l01627"></a><span class="lineno"> 1627</span>  _RAIterOut</div>
<div class="line"><a name="l01628"></a><span class="lineno"> 1628</span>  stable_multiway_merge(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01629"></a><span class="lineno"> 1629</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01630"></a><span class="lineno"> 1630</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01631"></a><span class="lineno"> 1631</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01632"></a><span class="lineno"> 1632</span>  sampling_tag __tag)</div>
<div class="line"><a name="l01633"></a><span class="lineno"> 1633</span>  {</div>
<div class="line"><a name="l01634"></a><span class="lineno"> 1634</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01635"></a><span class="lineno"> 1635</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01636"></a><span class="lineno"> 1636</span> </div>
<div class="line"><a name="l01637"></a><span class="lineno"> 1637</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01638"></a><span class="lineno"> 1638</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01639"></a><span class="lineno"> 1639</span>  return __target;</div>
<div class="line"><a name="l01640"></a><span class="lineno"> 1640</span> </div>
<div class="line"><a name="l01641"></a><span class="lineno"> 1641</span>  <span class="comment">// Execute merge; maybe parallel, depending on the number of merged</span></div>
<div class="line"><a name="l01642"></a><span class="lineno"> 1642</span>  <span class="comment">// elements and the number of sequences and global thresholds in</span></div>
<div class="line"><a name="l01643"></a><span class="lineno"> 1643</span>  <span class="comment">// Settings.</span></div>
<div class="line"><a name="l01644"></a><span class="lineno"> 1644</span>  if ((__seqs_end - __seqs_begin > 1)</div>
<div class="line"><a name="l01645"></a><span class="lineno"> 1645</span>  && <a class="code" href="a01459.html#ad816e8f52b933c9300598977cada7d18" title="Determine at compile(?)-time if the parallel variant of an algorithm should be called.">_GLIBCXX_PARALLEL_CONDITION</a>(</div>
<div class="line"><a name="l01646"></a><span class="lineno"> 1646</span>  ((__seqs_end - __seqs_begin) >=</div>
<div class="line"><a name="l01647"></a><span class="lineno"> 1647</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_k)</div>
<div class="line"><a name="l01648"></a><span class="lineno"> 1648</span>  && ((<a class="code" href="a01597.html#a1cbb61a4863a306daa23823d89f9bef1" title="Unsigned integer to index __elements. The total number of elements for each algorithm must fit into t...">_SequenceIndex</a>)__length >=</div>
<div class="line"><a name="l01649"></a><span class="lineno"> 1649</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_n)))</div>
<div class="line"><a name="l01650"></a><span class="lineno"> 1650</span>  return <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a></div>
<div class="line"><a name="l01651"></a><span class="lineno"> 1651</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01652"></a><span class="lineno"> 1652</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01653"></a><span class="lineno"> 1653</span>  <a class="code" href="a01597.html#a0e39d3891745fd0e244fb125bf34ce8b" title="Sampling based splitting for parallel multiway-merge routine.">multiway_merge_sampling_splitting</a><<span class="comment">/* __stable = */</span> true,</div>
<div class="line"><a name="l01654"></a><span class="lineno"> 1654</span>  typename std::iterator_traits<_RAIterPairIterator></div>
<div class="line"><a name="l01655"></a><span class="lineno"> 1655</span>  ::value_type*, _Compare, _DifferenceTp>,</div>
<div class="line"><a name="l01656"></a><span class="lineno"> 1656</span>  static_cast<_DifferenceType>(__length), __comp,</div>
<div class="line"><a name="l01657"></a><span class="lineno"> 1657</span>  __tag.__get_num_threads());</div>
<div class="line"><a name="l01658"></a><span class="lineno"> 1658</span>  else</div>
<div class="line"><a name="l01659"></a><span class="lineno"> 1659</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01660"></a><span class="lineno"> 1660</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> false></div>
<div class="line"><a name="l01661"></a><span class="lineno"> 1661</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01662"></a><span class="lineno"> 1662</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01663"></a><span class="lineno"> 1663</span>  }</div>
<div class="line"><a name="l01664"></a><span class="lineno"> 1664</span> </div>
<div class="line"><a name="l01665"></a><span class="lineno"> 1665</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01666"></a><span class="lineno"> 1666</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01667"></a><span class="lineno"> 1667</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01668"></a><span class="lineno"> 1668</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01669"></a><span class="lineno"> 1669</span>  typename _Compare></div>
<div class="line"><a name="l01670"></a><span class="lineno"> 1670</span>  _RAIterOut</div>
<div class="line"><a name="l01671"></a><span class="lineno"> 1671</span>  stable_multiway_merge(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01672"></a><span class="lineno"> 1672</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01673"></a><span class="lineno"> 1673</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01674"></a><span class="lineno"> 1674</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01675"></a><span class="lineno"> 1675</span>  parallel_tag __tag = parallel_tag(0))</div>
<div class="line"><a name="l01676"></a><span class="lineno"> 1676</span>  {</div>
<div class="line"><a name="l01677"></a><span class="lineno"> 1677</span>  <span class="keywordflow">return</span> stable_multiway_merge</div>
<div class="line"><a name="l01678"></a><span class="lineno"> 1678</span>  (__seqs_begin, __seqs_end, __target, __length, __comp,</div>
<div class="line"><a name="l01679"></a><span class="lineno"> 1679</span>  exact_tag(__tag.__get_num_threads()));</div>
<div class="line"><a name="l01680"></a><span class="lineno"> 1680</span>  }</div>
<div class="line"><a name="l01681"></a><span class="lineno"> 1681</span> </div>
<div class="line"><a name="l01682"></a><span class="lineno"> 1682</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01683"></a><span class="lineno"> 1683</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01684"></a><span class="lineno"> 1684</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01685"></a><span class="lineno"> 1685</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01686"></a><span class="lineno"> 1686</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01687"></a><span class="lineno"> 1687</span>  _RAIterOut</div>
<div class="line"><a name="l01688"></a><span class="lineno"> 1688</span>  stable_multiway_merge(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01689"></a><span class="lineno"> 1689</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01690"></a><span class="lineno"> 1690</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01691"></a><span class="lineno"> 1691</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01692"></a><span class="lineno"> 1692</span>  default_parallel_tag __tag)</div>
<div class="line"><a name="l01693"></a><span class="lineno"> 1693</span>  {</div>
<div class="line"><a name="l01694"></a><span class="lineno"> 1694</span>  <span class="keywordflow">return</span> stable_multiway_merge</div>
<div class="line"><a name="l01695"></a><span class="lineno"> 1695</span>  (__seqs_begin, __seqs_end, __target, __length, __comp,</div>
<div class="line"><a name="l01696"></a><span class="lineno"> 1696</span>  exact_tag(__tag.__get_num_threads()));</div>
<div class="line"><a name="l01697"></a><span class="lineno"> 1697</span>  }</div>
<div class="line"><a name="l01698"></a><span class="lineno"> 1698</span> <span class="comment"></span></div>
<div class="line"><a name="l01699"></a><span class="lineno"> 1699</span> <span class="comment"> /**</span></div>
<div class="line"><a name="l01700"></a><span class="lineno"> 1700</span> <span class="comment"> * @brief Multiway Merge Frontend.</span></div>
<div class="line"><a name="l01701"></a><span class="lineno"> 1701</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01702"></a><span class="lineno"> 1702</span> <span class="comment"> * Merge the sequences specified by seqs_begin and __seqs_end into</span></div>
<div class="line"><a name="l01703"></a><span class="lineno"> 1703</span> <span class="comment"> * __target. __seqs_begin and __seqs_end must point to a sequence of</span></div>
<div class="line"><a name="l01704"></a><span class="lineno"> 1704</span> <span class="comment"> * pairs. These pairs must contain an iterator to the beginning</span></div>
<div class="line"><a name="l01705"></a><span class="lineno"> 1705</span> <span class="comment"> * of a sequence in their first entry and an iterator the _M_end of</span></div>
<div class="line"><a name="l01706"></a><span class="lineno"> 1706</span> <span class="comment"> * the same sequence in their second entry.</span></div>
<div class="line"><a name="l01707"></a><span class="lineno"> 1707</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01708"></a><span class="lineno"> 1708</span> <span class="comment"> * Ties are broken arbitrarily. See stable_multiway_merge for a variant</span></div>
<div class="line"><a name="l01709"></a><span class="lineno"> 1709</span> <span class="comment"> * that breaks ties by sequence number but is slower.</span></div>
<div class="line"><a name="l01710"></a><span class="lineno"> 1710</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01711"></a><span class="lineno"> 1711</span> <span class="comment"> * The first entries of the pairs (i.e. the begin iterators) will be moved</span></div>
<div class="line"><a name="l01712"></a><span class="lineno"> 1712</span> <span class="comment"> * forward accordingly.</span></div>
<div class="line"><a name="l01713"></a><span class="lineno"> 1713</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01714"></a><span class="lineno"> 1714</span> <span class="comment"> * The output sequence has to provide enough space for all elements</span></div>
<div class="line"><a name="l01715"></a><span class="lineno"> 1715</span> <span class="comment"> * that are written to it.</span></div>
<div class="line"><a name="l01716"></a><span class="lineno"> 1716</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01717"></a><span class="lineno"> 1717</span> <span class="comment"> * This function will merge the input sequences:</span></div>
<div class="line"><a name="l01718"></a><span class="lineno"> 1718</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01719"></a><span class="lineno"> 1719</span> <span class="comment"> * - not stable</span></div>
<div class="line"><a name="l01720"></a><span class="lineno"> 1720</span> <span class="comment"> * - parallel, depending on the input size and Settings</span></div>
<div class="line"><a name="l01721"></a><span class="lineno"> 1721</span> <span class="comment"> * - using sampling for splitting</span></div>
<div class="line"><a name="l01722"></a><span class="lineno"> 1722</span> <span class="comment"> * - using sentinels</span></div>
<div class="line"><a name="l01723"></a><span class="lineno"> 1723</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01724"></a><span class="lineno"> 1724</span> <span class="comment"> * You have to take care that the element the _M_end iterator points to is</span></div>
<div class="line"><a name="l01725"></a><span class="lineno"> 1725</span> <span class="comment"> * readable and contains a value that is greater than any other non-sentinel</span></div>
<div class="line"><a name="l01726"></a><span class="lineno"> 1726</span> <span class="comment"> * value in all sequences.</span></div>
<div class="line"><a name="l01727"></a><span class="lineno"> 1727</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01728"></a><span class="lineno"> 1728</span> <span class="comment"> * Example:</span></div>
<div class="line"><a name="l01729"></a><span class="lineno"> 1729</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01730"></a><span class="lineno"> 1730</span> <span class="comment"> * <pre></span></div>
<div class="line"><a name="l01731"></a><span class="lineno"> 1731</span> <span class="comment"> * int sequences[10][11];</span></div>
<div class="line"><a name="l01732"></a><span class="lineno"> 1732</span> <span class="comment"> * for (int __i = 0; __i < 10; ++__i)</span></div>
<div class="line"><a name="l01733"></a><span class="lineno"> 1733</span> <span class="comment"> * for (int __j = 0; __i < 11; ++__j)</span></div>
<div class="line"><a name="l01734"></a><span class="lineno"> 1734</span> <span class="comment"> * sequences[__i][__j] = __j; // __last one is sentinel!</span></div>
<div class="line"><a name="l01735"></a><span class="lineno"> 1735</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01736"></a><span class="lineno"> 1736</span> <span class="comment"> * int __out[33];</span></div>
<div class="line"><a name="l01737"></a><span class="lineno"> 1737</span> <span class="comment"> * std::vector<std::pair<int*> > seqs;</span></div>
<div class="line"><a name="l01738"></a><span class="lineno"> 1738</span> <span class="comment"> * for (int __i = 0; __i < 10; ++__i)</span></div>
<div class="line"><a name="l01739"></a><span class="lineno"> 1739</span> <span class="comment"> * { seqs.push(std::make_pair<int*>(sequences[__i],</span></div>
<div class="line"><a name="l01740"></a><span class="lineno"> 1740</span> <span class="comment"> * sequences[__i] + 10)) }</span></div>
<div class="line"><a name="l01741"></a><span class="lineno"> 1741</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01742"></a><span class="lineno"> 1742</span> <span class="comment"> * multiway_merge(seqs.begin(), seqs.end(), __target, std::less<int>(), 33);</span></div>
<div class="line"><a name="l01743"></a><span class="lineno"> 1743</span> <span class="comment"> * </pre></span></div>
<div class="line"><a name="l01744"></a><span class="lineno"> 1744</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01745"></a><span class="lineno"> 1745</span> <span class="comment"> * @pre All input sequences must be sorted.</span></div>
<div class="line"><a name="l01746"></a><span class="lineno"> 1746</span> <span class="comment"> * @pre Target must provide enough space to merge out length elements or</span></div>
<div class="line"><a name="l01747"></a><span class="lineno"> 1747</span> <span class="comment"> * the number of elements in all sequences, whichever is smaller.</span></div>
<div class="line"><a name="l01748"></a><span class="lineno"> 1748</span> <span class="comment"> * @pre For each @c __i, @c __seqs_begin[__i].second must be the end</span></div>
<div class="line"><a name="l01749"></a><span class="lineno"> 1749</span> <span class="comment"> * marker of the sequence, but also reference the one more __sentinel</span></div>
<div class="line"><a name="l01750"></a><span class="lineno"> 1750</span> <span class="comment"> * element.</span></div>
<div class="line"><a name="l01751"></a><span class="lineno"> 1751</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01752"></a><span class="lineno"> 1752</span> <span class="comment"> * @post [__target, return __value) contains merged __elements from the</span></div>
<div class="line"><a name="l01753"></a><span class="lineno"> 1753</span> <span class="comment"> * input sequences.</span></div>
<div class="line"><a name="l01754"></a><span class="lineno"> 1754</span> <span class="comment"> * @post return __value - __target = min(__length, number of elements in all</span></div>
<div class="line"><a name="l01755"></a><span class="lineno"> 1755</span> <span class="comment"> * sequences).</span></div>
<div class="line"><a name="l01756"></a><span class="lineno"> 1756</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01757"></a><span class="lineno"> 1757</span> <span class="comment"> * @see stable_multiway_merge_sentinels</span></div>
<div class="line"><a name="l01758"></a><span class="lineno"> 1758</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01759"></a><span class="lineno"> 1759</span> <span class="comment"> * @tparam _RAIterPairIterator iterator over sequence</span></div>
<div class="line"><a name="l01760"></a><span class="lineno"> 1760</span> <span class="comment"> * of pairs of iterators</span></div>
<div class="line"><a name="l01761"></a><span class="lineno"> 1761</span> <span class="comment"> * @tparam _RAIterOut iterator over target sequence</span></div>
<div class="line"><a name="l01762"></a><span class="lineno"> 1762</span> <span class="comment"> * @tparam _DifferenceTp difference type for the sequence</span></div>
<div class="line"><a name="l01763"></a><span class="lineno"> 1763</span> <span class="comment"> * @tparam _Compare strict weak ordering type to compare elements</span></div>
<div class="line"><a name="l01764"></a><span class="lineno"> 1764</span> <span class="comment"> * in sequences</span></div>
<div class="line"><a name="l01765"></a><span class="lineno"> 1765</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01766"></a><span class="lineno"> 1766</span> <span class="comment"> * @param __seqs_begin __begin of sequence __sequence</span></div>
<div class="line"><a name="l01767"></a><span class="lineno"> 1767</span> <span class="comment"> * @param __seqs_end _M_end of sequence __sequence</span></div>
<div class="line"><a name="l01768"></a><span class="lineno"> 1768</span> <span class="comment"> * @param __target target sequence to merge to.</span></div>
<div class="line"><a name="l01769"></a><span class="lineno"> 1769</span> <span class="comment"> * @param __comp strict weak ordering to use for element comparison.</span></div>
<div class="line"><a name="l01770"></a><span class="lineno"> 1770</span> <span class="comment"> * @param __length Maximum length to merge, possibly larger than the</span></div>
<div class="line"><a name="l01771"></a><span class="lineno"> 1771</span> <span class="comment"> * number of elements available.</span></div>
<div class="line"><a name="l01772"></a><span class="lineno"> 1772</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01773"></a><span class="lineno"> 1773</span> <span class="comment"> * @return _M_end iterator of output sequence</span></div>
<div class="line"><a name="l01774"></a><span class="lineno"> 1774</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01775"></a><span class="lineno"> 1775</span>  <span class="comment">// multiway_merge_sentinels</span></div>
<div class="line"><a name="l01776"></a><span class="lineno"> 1776</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01777"></a><span class="lineno"> 1777</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01778"></a><span class="lineno"> 1778</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01779"></a><span class="lineno"> 1779</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01780"></a><span class="lineno"> 1780</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01781"></a><span class="lineno"> 1781</span>  _RAIterOut</div>
<div class="line"><a name="l01782"></a><span class="lineno"><a class="code" href="a01597.html#a4d6e76ac42b48f0033139352dcb0418f"> 1782</a></span>  <a class="code" href="a01597.html#a4d6e76ac42b48f0033139352dcb0418f" title="Multiway Merge Frontend.">multiway_merge_sentinels</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01783"></a><span class="lineno"> 1783</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01784"></a><span class="lineno"> 1784</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01785"></a><span class="lineno"> 1785</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01786"></a><span class="lineno"> 1786</span>  <a class="code" href="a00183.html" title="Forces sequential execution at compile time.">__gnu_parallel::sequential_tag</a>)</div>
<div class="line"><a name="l01787"></a><span class="lineno"> 1787</span>  {</div>
<div class="line"><a name="l01788"></a><span class="lineno"> 1788</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01789"></a><span class="lineno"> 1789</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01790"></a><span class="lineno"> 1790</span> </div>
<div class="line"><a name="l01791"></a><span class="lineno"> 1791</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01792"></a><span class="lineno"> 1792</span>  <span class="keywordflow">if</span> (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01793"></a><span class="lineno"> 1793</span>  <span class="keywordflow">return</span> __target;</div>
<div class="line"><a name="l01794"></a><span class="lineno"> 1794</span> </div>
<div class="line"><a name="l01795"></a><span class="lineno"> 1795</span>  <span class="comment">// Execute multiway merge *sequentially*.</span></div>
<div class="line"><a name="l01796"></a><span class="lineno"> 1796</span>  <span class="keywordflow">return</span> <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01797"></a><span class="lineno"> 1797</span>  <<span class="comment">/* __stable = */</span> <span class="keyword">false</span>, <span class="comment">/* __sentinels = */</span> <span class="keyword">true</span>></div>
<div class="line"><a name="l01798"></a><span class="lineno"> 1798</span>  (__seqs_begin, __seqs_end,</div>
<div class="line"><a name="l01799"></a><span class="lineno"> 1799</span>  __target, *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01800"></a><span class="lineno"> 1800</span>  }</div>
<div class="line"><a name="l01801"></a><span class="lineno"> 1801</span> </div>
<div class="line"><a name="l01802"></a><span class="lineno"> 1802</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01803"></a><span class="lineno"> 1803</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01804"></a><span class="lineno"> 1804</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01805"></a><span class="lineno"> 1805</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01806"></a><span class="lineno"> 1806</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01807"></a><span class="lineno"> 1807</span>  _RAIterOut</div>
<div class="line"><a name="l01808"></a><span class="lineno"> 1808</span>  <a class="code" href="a01597.html#a4d6e76ac42b48f0033139352dcb0418f" title="Multiway Merge Frontend.">multiway_merge_sentinels</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01809"></a><span class="lineno"> 1809</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01810"></a><span class="lineno"> 1810</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01811"></a><span class="lineno"> 1811</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01812"></a><span class="lineno"> 1812</span>  <a class="code" href="a00172.html" title="Forces parallel merging with exact splitting, at compile time.">__gnu_parallel::exact_tag</a> __tag)</div>
<div class="line"><a name="l01813"></a><span class="lineno"> 1813</span>  {</div>
<div class="line"><a name="l01814"></a><span class="lineno"> 1814</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01815"></a><span class="lineno"> 1815</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01816"></a><span class="lineno"> 1816</span> </div>
<div class="line"><a name="l01817"></a><span class="lineno"> 1817</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01818"></a><span class="lineno"> 1818</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01819"></a><span class="lineno"> 1819</span>  return __target;</div>
<div class="line"><a name="l01820"></a><span class="lineno"> 1820</span> </div>
<div class="line"><a name="l01821"></a><span class="lineno"> 1821</span>  <span class="comment">// Execute merge; maybe parallel, depending on the number of merged</span></div>
<div class="line"><a name="l01822"></a><span class="lineno"> 1822</span>  <span class="comment">// elements and the number of sequences and global thresholds in</span></div>
<div class="line"><a name="l01823"></a><span class="lineno"> 1823</span>  <span class="comment">// Settings.</span></div>
<div class="line"><a name="l01824"></a><span class="lineno"> 1824</span>  if ((__seqs_end - __seqs_begin > 1)</div>
<div class="line"><a name="l01825"></a><span class="lineno"> 1825</span>  && <a class="code" href="a01459.html#ad816e8f52b933c9300598977cada7d18" title="Determine at compile(?)-time if the parallel variant of an algorithm should be called.">_GLIBCXX_PARALLEL_CONDITION</a>(</div>
<div class="line"><a name="l01826"></a><span class="lineno"> 1826</span>  ((__seqs_end - __seqs_begin) >=</div>
<div class="line"><a name="l01827"></a><span class="lineno"> 1827</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_k)</div>
<div class="line"><a name="l01828"></a><span class="lineno"> 1828</span>  && ((<a class="code" href="a01597.html#a1cbb61a4863a306daa23823d89f9bef1" title="Unsigned integer to index __elements. The total number of elements for each algorithm must fit into t...">_SequenceIndex</a>)__length >=</div>
<div class="line"><a name="l01829"></a><span class="lineno"> 1829</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_n)))</div>
<div class="line"><a name="l01830"></a><span class="lineno"> 1830</span>  return <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a></div>
<div class="line"><a name="l01831"></a><span class="lineno"> 1831</span>  <<span class="comment">/* __stable = */</span> false, <span class="comment">/* __sentinels = */</span> true></div>
<div class="line"><a name="l01832"></a><span class="lineno"> 1832</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01833"></a><span class="lineno"> 1833</span>  <a class="code" href="a01597.html#a567621588e461a8759651e29cd964ab9" title="Exact splitting for parallel multiway-merge routine.">multiway_merge_exact_splitting</a><<span class="comment">/* __stable = */</span> false,</div>
<div class="line"><a name="l01834"></a><span class="lineno"> 1834</span>  typename std::iterator_traits<_RAIterPairIterator></div>
<div class="line"><a name="l01835"></a><span class="lineno"> 1835</span>  ::value_type*, _Compare, _DifferenceTp>,</div>
<div class="line"><a name="l01836"></a><span class="lineno"> 1836</span>  static_cast<_DifferenceType>(__length), __comp,</div>
<div class="line"><a name="l01837"></a><span class="lineno"> 1837</span>  __tag.__get_num_threads());</div>
<div class="line"><a name="l01838"></a><span class="lineno"> 1838</span>  else</div>
<div class="line"><a name="l01839"></a><span class="lineno"> 1839</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01840"></a><span class="lineno"> 1840</span>  <<span class="comment">/* __stable = */</span> false, <span class="comment">/* __sentinels = */</span> true></div>
<div class="line"><a name="l01841"></a><span class="lineno"> 1841</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01842"></a><span class="lineno"> 1842</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01843"></a><span class="lineno"> 1843</span>  }</div>
<div class="line"><a name="l01844"></a><span class="lineno"> 1844</span> </div>
<div class="line"><a name="l01845"></a><span class="lineno"> 1845</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01846"></a><span class="lineno"> 1846</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01847"></a><span class="lineno"> 1847</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01848"></a><span class="lineno"> 1848</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01849"></a><span class="lineno"> 1849</span>  typename _Compare></div>
<div class="line"><a name="l01850"></a><span class="lineno"> 1850</span>  _RAIterOut</div>
<div class="line"><a name="l01851"></a><span class="lineno"> 1851</span>  <a class="code" href="a01597.html#a4d6e76ac42b48f0033139352dcb0418f" title="Multiway Merge Frontend.">multiway_merge_sentinels</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01852"></a><span class="lineno"> 1852</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01853"></a><span class="lineno"> 1853</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01854"></a><span class="lineno"> 1854</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01855"></a><span class="lineno"> 1855</span>  sampling_tag __tag)</div>
<div class="line"><a name="l01856"></a><span class="lineno"> 1856</span>  {</div>
<div class="line"><a name="l01857"></a><span class="lineno"> 1857</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01858"></a><span class="lineno"> 1858</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01859"></a><span class="lineno"> 1859</span> </div>
<div class="line"><a name="l01860"></a><span class="lineno"> 1860</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01861"></a><span class="lineno"> 1861</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01862"></a><span class="lineno"> 1862</span>  return __target;</div>
<div class="line"><a name="l01863"></a><span class="lineno"> 1863</span> </div>
<div class="line"><a name="l01864"></a><span class="lineno"> 1864</span>  <span class="comment">// Execute merge; maybe parallel, depending on the number of merged</span></div>
<div class="line"><a name="l01865"></a><span class="lineno"> 1865</span>  <span class="comment">// elements and the number of sequences and global thresholds in</span></div>
<div class="line"><a name="l01866"></a><span class="lineno"> 1866</span>  <span class="comment">// Settings.</span></div>
<div class="line"><a name="l01867"></a><span class="lineno"> 1867</span>  if ((__seqs_end - __seqs_begin > 1)</div>
<div class="line"><a name="l01868"></a><span class="lineno"> 1868</span>  && <a class="code" href="a01459.html#ad816e8f52b933c9300598977cada7d18" title="Determine at compile(?)-time if the parallel variant of an algorithm should be called.">_GLIBCXX_PARALLEL_CONDITION</a>(</div>
<div class="line"><a name="l01869"></a><span class="lineno"> 1869</span>  ((__seqs_end - __seqs_begin) >=</div>
<div class="line"><a name="l01870"></a><span class="lineno"> 1870</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_k)</div>
<div class="line"><a name="l01871"></a><span class="lineno"> 1871</span>  && ((<a class="code" href="a01597.html#a1cbb61a4863a306daa23823d89f9bef1" title="Unsigned integer to index __elements. The total number of elements for each algorithm must fit into t...">_SequenceIndex</a>)__length >=</div>
<div class="line"><a name="l01872"></a><span class="lineno"> 1872</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_n)))</div>
<div class="line"><a name="l01873"></a><span class="lineno"> 1873</span>  return <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a></div>
<div class="line"><a name="l01874"></a><span class="lineno"> 1874</span>  <<span class="comment">/* __stable = */</span> false, <span class="comment">/* __sentinels = */</span> true></div>
<div class="line"><a name="l01875"></a><span class="lineno"> 1875</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01876"></a><span class="lineno"> 1876</span>  <a class="code" href="a01597.html#a0e39d3891745fd0e244fb125bf34ce8b" title="Sampling based splitting for parallel multiway-merge routine.">multiway_merge_sampling_splitting</a><<span class="comment">/* __stable = */</span> false,</div>
<div class="line"><a name="l01877"></a><span class="lineno"> 1877</span>  typename std::iterator_traits<_RAIterPairIterator></div>
<div class="line"><a name="l01878"></a><span class="lineno"> 1878</span>  ::value_type*, _Compare, _DifferenceTp>,</div>
<div class="line"><a name="l01879"></a><span class="lineno"> 1879</span>  static_cast<_DifferenceType>(__length), __comp,</div>
<div class="line"><a name="l01880"></a><span class="lineno"> 1880</span>  __tag.__get_num_threads());</div>
<div class="line"><a name="l01881"></a><span class="lineno"> 1881</span>  else</div>
<div class="line"><a name="l01882"></a><span class="lineno"> 1882</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01883"></a><span class="lineno"> 1883</span>  <<span class="comment">/* __stable = */</span>false, <span class="comment">/* __sentinels = */</span> true>(</div>
<div class="line"><a name="l01884"></a><span class="lineno"> 1884</span>  __seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01885"></a><span class="lineno"> 1885</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01886"></a><span class="lineno"> 1886</span>  }</div>
<div class="line"><a name="l01887"></a><span class="lineno"> 1887</span> </div>
<div class="line"><a name="l01888"></a><span class="lineno"> 1888</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01889"></a><span class="lineno"> 1889</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01890"></a><span class="lineno"> 1890</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01891"></a><span class="lineno"> 1891</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01892"></a><span class="lineno"> 1892</span>  typename _Compare></div>
<div class="line"><a name="l01893"></a><span class="lineno"> 1893</span>  _RAIterOut</div>
<div class="line"><a name="l01894"></a><span class="lineno"> 1894</span>  <a class="code" href="a01597.html#a4d6e76ac42b48f0033139352dcb0418f" title="Multiway Merge Frontend.">multiway_merge_sentinels</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01895"></a><span class="lineno"> 1895</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01896"></a><span class="lineno"> 1896</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01897"></a><span class="lineno"> 1897</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01898"></a><span class="lineno"> 1898</span>  parallel_tag __tag = parallel_tag(0))</div>
<div class="line"><a name="l01899"></a><span class="lineno"> 1899</span>  {</div>
<div class="line"><a name="l01900"></a><span class="lineno"> 1900</span>  <span class="keywordflow">return</span> <a class="code" href="a01597.html#a4d6e76ac42b48f0033139352dcb0418f" title="Multiway Merge Frontend.">multiway_merge_sentinels</a></div>
<div class="line"><a name="l01901"></a><span class="lineno"> 1901</span>  (__seqs_begin, __seqs_end, __target, __length, __comp,</div>
<div class="line"><a name="l01902"></a><span class="lineno"> 1902</span>  exact_tag(__tag.__get_num_threads()));</div>
<div class="line"><a name="l01903"></a><span class="lineno"> 1903</span>  }</div>
<div class="line"><a name="l01904"></a><span class="lineno"> 1904</span> </div>
<div class="line"><a name="l01905"></a><span class="lineno"> 1905</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01906"></a><span class="lineno"> 1906</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01907"></a><span class="lineno"> 1907</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01908"></a><span class="lineno"> 1908</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01909"></a><span class="lineno"> 1909</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01910"></a><span class="lineno"> 1910</span>  _RAIterOut</div>
<div class="line"><a name="l01911"></a><span class="lineno"> 1911</span>  <a class="code" href="a01597.html#a4d6e76ac42b48f0033139352dcb0418f" title="Multiway Merge Frontend.">multiway_merge_sentinels</a>(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01912"></a><span class="lineno"> 1912</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01913"></a><span class="lineno"> 1913</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01914"></a><span class="lineno"> 1914</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01915"></a><span class="lineno"> 1915</span>  default_parallel_tag __tag)</div>
<div class="line"><a name="l01916"></a><span class="lineno"> 1916</span>  {</div>
<div class="line"><a name="l01917"></a><span class="lineno"> 1917</span>  <span class="keywordflow">return</span> <a class="code" href="a01597.html#a4d6e76ac42b48f0033139352dcb0418f" title="Multiway Merge Frontend.">multiway_merge_sentinels</a></div>
<div class="line"><a name="l01918"></a><span class="lineno"> 1918</span>  (__seqs_begin, __seqs_end, __target, __length, __comp,</div>
<div class="line"><a name="l01919"></a><span class="lineno"> 1919</span>  exact_tag(__tag.__get_num_threads()));</div>
<div class="line"><a name="l01920"></a><span class="lineno"> 1920</span>  }</div>
<div class="line"><a name="l01921"></a><span class="lineno"> 1921</span> </div>
<div class="line"><a name="l01922"></a><span class="lineno"> 1922</span>  <span class="comment">// stable_multiway_merge_sentinels</span></div>
<div class="line"><a name="l01923"></a><span class="lineno"> 1923</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01924"></a><span class="lineno"> 1924</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l01925"></a><span class="lineno"> 1925</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l01926"></a><span class="lineno"> 1926</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l01927"></a><span class="lineno"> 1927</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l01928"></a><span class="lineno"> 1928</span>  _RAIterOut</div>
<div class="line"><a name="l01929"></a><span class="lineno"> 1929</span>  stable_multiway_merge_sentinels(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01930"></a><span class="lineno"> 1930</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01931"></a><span class="lineno"> 1931</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01932"></a><span class="lineno"> 1932</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01933"></a><span class="lineno"> 1933</span>  <a class="code" href="a00183.html" title="Forces sequential execution at compile time.">__gnu_parallel::sequential_tag</a>)</div>
<div class="line"><a name="l01934"></a><span class="lineno"> 1934</span>  {</div>
<div class="line"><a name="l01935"></a><span class="lineno"> 1935</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01936"></a><span class="lineno"> 1936</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01937"></a><span class="lineno"> 1937</span> </div>
<div class="line"><a name="l01938"></a><span class="lineno"> 1938</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01939"></a><span class="lineno"> 1939</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01940"></a><span class="lineno"> 1940</span>  return __target;</div>
<div class="line"><a name="l01941"></a><span class="lineno"> 1941</span> </div>
<div class="line"><a name="l01942"></a><span class="lineno"> 1942</span>  <span class="comment">// Execute multiway merge *sequentially*.</span></div>
<div class="line"><a name="l01943"></a><span class="lineno"> 1943</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01944"></a><span class="lineno"> 1944</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> true></div>
<div class="line"><a name="l01945"></a><span class="lineno"> 1945</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01946"></a><span class="lineno"> 1946</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01947"></a><span class="lineno"> 1947</span>  }</div>
<div class="line"><a name="l01948"></a><span class="lineno"> 1948</span> </div>
<div class="line"><a name="l01949"></a><span class="lineno"> 1949</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01950"></a><span class="lineno"> 1950</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01951"></a><span class="lineno"> 1951</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01952"></a><span class="lineno"> 1952</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01953"></a><span class="lineno"> 1953</span>  typename _Compare></div>
<div class="line"><a name="l01954"></a><span class="lineno"> 1954</span>  _RAIterOut</div>
<div class="line"><a name="l01955"></a><span class="lineno"> 1955</span>  stable_multiway_merge_sentinels(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01956"></a><span class="lineno"> 1956</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l01957"></a><span class="lineno"> 1957</span>  _RAIterOut __target,</div>
<div class="line"><a name="l01958"></a><span class="lineno"> 1958</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l01959"></a><span class="lineno"> 1959</span>  __gnu_parallel::exact_tag __tag)</div>
<div class="line"><a name="l01960"></a><span class="lineno"> 1960</span>  {</div>
<div class="line"><a name="l01961"></a><span class="lineno"> 1961</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l01962"></a><span class="lineno"> 1962</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l01963"></a><span class="lineno"> 1963</span> </div>
<div class="line"><a name="l01964"></a><span class="lineno"> 1964</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l01965"></a><span class="lineno"> 1965</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l01966"></a><span class="lineno"> 1966</span>  return __target;</div>
<div class="line"><a name="l01967"></a><span class="lineno"> 1967</span> </div>
<div class="line"><a name="l01968"></a><span class="lineno"> 1968</span>  <span class="comment">// Execute merge; maybe parallel, depending on the number of merged</span></div>
<div class="line"><a name="l01969"></a><span class="lineno"> 1969</span>  <span class="comment">// elements and the number of sequences and global thresholds in</span></div>
<div class="line"><a name="l01970"></a><span class="lineno"> 1970</span>  <span class="comment">// Settings.</span></div>
<div class="line"><a name="l01971"></a><span class="lineno"> 1971</span>  if ((__seqs_end - __seqs_begin > 1)</div>
<div class="line"><a name="l01972"></a><span class="lineno"> 1972</span>  && <a class="code" href="a01459.html#ad816e8f52b933c9300598977cada7d18" title="Determine at compile(?)-time if the parallel variant of an algorithm should be called.">_GLIBCXX_PARALLEL_CONDITION</a>(</div>
<div class="line"><a name="l01973"></a><span class="lineno"> 1973</span>  ((__seqs_end - __seqs_begin) >=</div>
<div class="line"><a name="l01974"></a><span class="lineno"> 1974</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_k)</div>
<div class="line"><a name="l01975"></a><span class="lineno"> 1975</span>  && ((<a class="code" href="a01597.html#a1cbb61a4863a306daa23823d89f9bef1" title="Unsigned integer to index __elements. The total number of elements for each algorithm must fit into t...">_SequenceIndex</a>)__length >=</div>
<div class="line"><a name="l01976"></a><span class="lineno"> 1976</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_n)))</div>
<div class="line"><a name="l01977"></a><span class="lineno"> 1977</span>  return <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a></div>
<div class="line"><a name="l01978"></a><span class="lineno"> 1978</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> true></div>
<div class="line"><a name="l01979"></a><span class="lineno"> 1979</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01980"></a><span class="lineno"> 1980</span>  <a class="code" href="a01597.html#a567621588e461a8759651e29cd964ab9" title="Exact splitting for parallel multiway-merge routine.">multiway_merge_exact_splitting</a><<span class="comment">/* __stable = */</span> true,</div>
<div class="line"><a name="l01981"></a><span class="lineno"> 1981</span>  typename std::iterator_traits<_RAIterPairIterator></div>
<div class="line"><a name="l01982"></a><span class="lineno"> 1982</span>  ::value_type*, _Compare, _DifferenceTp>,</div>
<div class="line"><a name="l01983"></a><span class="lineno"> 1983</span>  static_cast<_DifferenceType>(__length), __comp,</div>
<div class="line"><a name="l01984"></a><span class="lineno"> 1984</span>  __tag.__get_num_threads());</div>
<div class="line"><a name="l01985"></a><span class="lineno"> 1985</span>  else</div>
<div class="line"><a name="l01986"></a><span class="lineno"> 1986</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l01987"></a><span class="lineno"> 1987</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> true></div>
<div class="line"><a name="l01988"></a><span class="lineno"> 1988</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l01989"></a><span class="lineno"> 1989</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l01990"></a><span class="lineno"> 1990</span>  }</div>
<div class="line"><a name="l01991"></a><span class="lineno"> 1991</span> </div>
<div class="line"><a name="l01992"></a><span class="lineno"> 1992</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l01993"></a><span class="lineno"> 1993</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l01994"></a><span class="lineno"> 1994</span>  typename _RAIterOut,</div>
<div class="line"><a name="l01995"></a><span class="lineno"> 1995</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l01996"></a><span class="lineno"> 1996</span>  typename _Compare></div>
<div class="line"><a name="l01997"></a><span class="lineno"> 1997</span>  _RAIterOut</div>
<div class="line"><a name="l01998"></a><span class="lineno"> 1998</span>  stable_multiway_merge_sentinels(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l01999"></a><span class="lineno"> 1999</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l02000"></a><span class="lineno"> 2000</span>  _RAIterOut __target,</div>
<div class="line"><a name="l02001"></a><span class="lineno"> 2001</span>  _DifferenceTp __length,</div>
<div class="line"><a name="l02002"></a><span class="lineno"> 2002</span>  _Compare __comp,</div>
<div class="line"><a name="l02003"></a><span class="lineno"> 2003</span>  sampling_tag __tag)</div>
<div class="line"><a name="l02004"></a><span class="lineno"> 2004</span>  {</div>
<div class="line"><a name="l02005"></a><span class="lineno"> 2005</span>  <span class="keyword">typedef</span> _DifferenceTp _DifferenceType;</div>
<div class="line"><a name="l02006"></a><span class="lineno"> 2006</span>  <a class="code" href="a01048.html#a77fb93c9cecec331ccee755972695128" title="Macro to produce log message when entering a function.">_GLIBCXX_CALL</a>(__seqs_end - __seqs_begin)</div>
<div class="line"><a name="l02007"></a><span class="lineno"> 2007</span> </div>
<div class="line"><a name="l02008"></a><span class="lineno"> 2008</span>  <span class="comment">// catch special case: no sequences</span></div>
<div class="line"><a name="l02009"></a><span class="lineno"> 2009</span>  if (__seqs_begin == __seqs_end)</div>
<div class="line"><a name="l02010"></a><span class="lineno"> 2010</span>  return __target;</div>
<div class="line"><a name="l02011"></a><span class="lineno"> 2011</span> </div>
<div class="line"><a name="l02012"></a><span class="lineno"> 2012</span>  <span class="comment">// Execute merge; maybe parallel, depending on the number of merged</span></div>
<div class="line"><a name="l02013"></a><span class="lineno"> 2013</span>  <span class="comment">// elements and the number of sequences and global thresholds in</span></div>
<div class="line"><a name="l02014"></a><span class="lineno"> 2014</span>  <span class="comment">// Settings.</span></div>
<div class="line"><a name="l02015"></a><span class="lineno"> 2015</span>  if ((__seqs_end - __seqs_begin > 1)</div>
<div class="line"><a name="l02016"></a><span class="lineno"> 2016</span>  && <a class="code" href="a01459.html#ad816e8f52b933c9300598977cada7d18" title="Determine at compile(?)-time if the parallel variant of an algorithm should be called.">_GLIBCXX_PARALLEL_CONDITION</a>(</div>
<div class="line"><a name="l02017"></a><span class="lineno"> 2017</span>  ((__seqs_end - __seqs_begin) >=</div>
<div class="line"><a name="l02018"></a><span class="lineno"> 2018</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_k)</div>
<div class="line"><a name="l02019"></a><span class="lineno"> 2019</span>  && ((<a class="code" href="a01597.html#a1cbb61a4863a306daa23823d89f9bef1" title="Unsigned integer to index __elements. The total number of elements for each algorithm must fit into t...">_SequenceIndex</a>)__length >=</div>
<div class="line"><a name="l02020"></a><span class="lineno"> 2020</span>  __gnu_parallel::_Settings::get().multiway_merge_minimal_n)))</div>
<div class="line"><a name="l02021"></a><span class="lineno"> 2021</span>  return <a class="code" href="a01597.html#a14c854d00d1321cf1ee7f6d12fb955c4" title="Parallel multi-way merge routine.">parallel_multiway_merge</a></div>
<div class="line"><a name="l02022"></a><span class="lineno"> 2022</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> true></div>
<div class="line"><a name="l02023"></a><span class="lineno"> 2023</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l02024"></a><span class="lineno"> 2024</span>  <a class="code" href="a01597.html#a0e39d3891745fd0e244fb125bf34ce8b" title="Sampling based splitting for parallel multiway-merge routine.">multiway_merge_sampling_splitting</a><<span class="comment">/* __stable = */</span> true,</div>
<div class="line"><a name="l02025"></a><span class="lineno"> 2025</span>  typename std::iterator_traits<_RAIterPairIterator></div>
<div class="line"><a name="l02026"></a><span class="lineno"> 2026</span>  ::value_type*, _Compare, _DifferenceTp>,</div>
<div class="line"><a name="l02027"></a><span class="lineno"> 2027</span>  static_cast<_DifferenceType>(__length), __comp,</div>
<div class="line"><a name="l02028"></a><span class="lineno"> 2028</span>  __tag.__get_num_threads());</div>
<div class="line"><a name="l02029"></a><span class="lineno"> 2029</span>  else</div>
<div class="line"><a name="l02030"></a><span class="lineno"> 2030</span>  return <a class="code" href="a01597.html#a5ccf0d17d06a0cdd449939227e55bd9d" title="Sequential multi-way merging switch.">__sequential_multiway_merge</a></div>
<div class="line"><a name="l02031"></a><span class="lineno"> 2031</span>  <<span class="comment">/* __stable = */</span> true, <span class="comment">/* __sentinels = */</span> true></div>
<div class="line"><a name="l02032"></a><span class="lineno"> 2032</span>  (__seqs_begin, __seqs_end, __target,</div>
<div class="line"><a name="l02033"></a><span class="lineno"> 2033</span>  *(__seqs_begin->second), __length, __comp);</div>
<div class="line"><a name="l02034"></a><span class="lineno"> 2034</span>  }</div>
<div class="line"><a name="l02035"></a><span class="lineno"> 2035</span> </div>
<div class="line"><a name="l02036"></a><span class="lineno"> 2036</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l02037"></a><span class="lineno"> 2037</span>  template<typename _RAIterPairIterator,</div>
<div class="line"><a name="l02038"></a><span class="lineno"> 2038</span>  typename _RAIterOut,</div>
<div class="line"><a name="l02039"></a><span class="lineno"> 2039</span>  typename _DifferenceTp,</div>
<div class="line"><a name="l02040"></a><span class="lineno"> 2040</span>  typename _Compare></div>
<div class="line"><a name="l02041"></a><span class="lineno"> 2041</span>  _RAIterOut</div>
<div class="line"><a name="l02042"></a><span class="lineno"> 2042</span>  stable_multiway_merge_sentinels(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l02043"></a><span class="lineno"> 2043</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l02044"></a><span class="lineno"> 2044</span>  _RAIterOut __target,</div>
<div class="line"><a name="l02045"></a><span class="lineno"> 2045</span>  _DifferenceTp __length,</div>
<div class="line"><a name="l02046"></a><span class="lineno"> 2046</span>  _Compare __comp,</div>
<div class="line"><a name="l02047"></a><span class="lineno"> 2047</span>  parallel_tag __tag = parallel_tag(0))</div>
<div class="line"><a name="l02048"></a><span class="lineno"> 2048</span>  {</div>
<div class="line"><a name="l02049"></a><span class="lineno"> 2049</span>  <span class="keywordflow">return</span> stable_multiway_merge_sentinels</div>
<div class="line"><a name="l02050"></a><span class="lineno"> 2050</span>  (__seqs_begin, __seqs_end, __target, __length, __comp,</div>
<div class="line"><a name="l02051"></a><span class="lineno"> 2051</span>  exact_tag(__tag.__get_num_threads()));</div>
<div class="line"><a name="l02052"></a><span class="lineno"> 2052</span>  }</div>
<div class="line"><a name="l02053"></a><span class="lineno"> 2053</span> </div>
<div class="line"><a name="l02054"></a><span class="lineno"> 2054</span>  <span class="comment">// public interface</span></div>
<div class="line"><a name="l02055"></a><span class="lineno"> 2055</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _RAIterPairIterator,</div>
<div class="line"><a name="l02056"></a><span class="lineno"> 2056</span>  <span class="keyword">typename</span> _RAIterOut,</div>
<div class="line"><a name="l02057"></a><span class="lineno"> 2057</span>  <span class="keyword">typename</span> _DifferenceTp,</div>
<div class="line"><a name="l02058"></a><span class="lineno"> 2058</span>  <span class="keyword">typename</span> _Compare></div>
<div class="line"><a name="l02059"></a><span class="lineno"> 2059</span>  _RAIterOut</div>
<div class="line"><a name="l02060"></a><span class="lineno"> 2060</span>  stable_multiway_merge_sentinels(_RAIterPairIterator __seqs_begin,</div>
<div class="line"><a name="l02061"></a><span class="lineno"> 2061</span>  _RAIterPairIterator __seqs_end,</div>
<div class="line"><a name="l02062"></a><span class="lineno"> 2062</span>  _RAIterOut __target,</div>
<div class="line"><a name="l02063"></a><span class="lineno"> 2063</span>  _DifferenceTp __length, _Compare __comp,</div>
<div class="line"><a name="l02064"></a><span class="lineno"> 2064</span>  default_parallel_tag __tag)</div>
<div class="line"><a name="l02065"></a><span class="lineno"> 2065</span>  {</div>
<div class="line"><a name="l02066"></a><span class="lineno"> 2066</span>  <span class="keywordflow">return</span> stable_multiway_merge_sentinels</div>
<div class="line"><a name="l02067"></a><span class="lineno"> 2067</span>  (__seqs_begin, __seqs_end, __target, __length, __comp,</div>
<div class="line"><a name="l02068"></a><span class="lineno"> 2068</span>  exact_tag(__tag.__get_num_threads()));</div>
<div class="line"><a name="l02069"></a><span class="lineno"> 2069</span>  }</div>
<div class="line"><a name="l02070"></a><span class="lineno"> 2070</span> }; <span class="comment">// namespace __gnu_parallel</span></div>
<div class="line"><a name="l02071"></a><span class="lineno"> 2071</span> </div>
<div class="line"><a name="l02072"></a><span class="lineno"> 2072</span> <span class="preprocessor">#endif </span><span class="comment">/* _GLIBCXX_PARALLEL_MULTIWAY_MERGE_H */</span><span class="preprocessor"></span></div>
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