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<a href="a00440.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">// Position types -*- 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) 1997-2018 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</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">// terms of the GNU General Public License as published by the</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// any later 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,</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// but 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</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// GNU 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 bits/postypes.h</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * This is an internal header file, included by other library headers.</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * Do not attempt to use it directly. @headername{iosfwd}</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> */</span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">//</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">// ISO C++ 14882: 27.4.1 - Types</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment">// ISO C++ 14882: 27.4.3 - Template class fpos</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> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#ifndef _GLIBCXX_POSTYPES_H</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#define _GLIBCXX_POSTYPES_H 1</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span> </div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#pragma GCC system_header</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include <<a class="code" href="a00254.html">cwchar</a>></span> <span class="comment">// For mbstate_t</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> </div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// XXX If <stdint.h> is really needed, make sure to define the macros</span></div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">// before including it, in order not to break <tr1/cstdint> (and <cstdint></span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">// in C++11). Reconsider all this as soon as possible...</span></div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#if (defined(_GLIBCXX_HAVE_INT64_T) && !defined(_GLIBCXX_HAVE_INT64_T_LONG) \</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor"> && !defined(_GLIBCXX_HAVE_INT64_T_LONG_LONG))</span></div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span> </div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#ifndef __STDC_LIMIT_MACROS</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor"># define _UNDEF__STDC_LIMIT_MACROS</span></div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor"># define __STDC_LIMIT_MACROS</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">#ifndef __STDC_CONSTANT_MACROS</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor"># define _UNDEF__STDC_CONSTANT_MACROS</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor"># define __STDC_CONSTANT_MACROS</span></div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#include <stdint.h></span> <span class="comment">// For int64_t</span></div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#ifdef _UNDEF__STDC_LIMIT_MACROS</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor"># undef __STDC_LIMIT_MACROS</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor"># undef _UNDEF__STDC_LIMIT_MACROS</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#ifdef _UNDEF__STDC_CONSTANT_MACROS</span></div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="preprocessor"># undef __STDC_CONSTANT_MACROS</span></div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor"># undef _UNDEF__STDC_CONSTANT_MACROS</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> </div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">namespace </span><a class="code" href="a01538.html">std</a> _GLIBCXX_VISIBILITY(default)</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> {</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> _GLIBCXX_BEGIN_NAMESPACE_VERSION</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span> </div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="comment">// The types streamoff, streampos and wstreampos and the class</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="comment">// template fpos<> are described in clauses 21.1.2, 21.1.3, 27.1.2,</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// 27.2, 27.4.1, 27.4.3 and D.6. Despite all this verbiage, the</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="comment">// behaviour of these types is mostly implementation defined or</span></div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="comment">// unspecified. The behaviour in this implementation is as noted</span></div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="comment">// below.</span></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"> /**</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * @brief Type used by fpos, char_traits<char>, and char_traits<wchar_t>.</span></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"> * In clauses 21.1.3.1 and 27.4.1 streamoff is described as an</span></div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment"> * implementation defined type.</span></div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment"> * Note: In versions of GCC up to and including GCC 3.3, streamoff</span></div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="comment"> * was typedef long.</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="comment"> */</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor">#ifdef _GLIBCXX_HAVE_INT64_T_LONG</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">typedef</span> <span class="keywordtype">long</span> <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="preprocessor">#elif defined(_GLIBCXX_HAVE_INT64_T_LONG_LONG)</span></div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keyword">typedef</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor">#elif defined(_GLIBCXX_HAVE_INT64_T) </span></div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="keyword">typedef</span> int64_t <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>;</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00094"></a><span class="lineno"><a class="line" href="a01538.html#a48649c5c32f0251572b366063ee93032"> 94</a></span>  <span class="keyword">typedef</span> <span class="keywordtype">long</span> <span class="keywordtype">long</span> <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>;</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> <span class="comment"></span></div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment"> /// Integral type for I/O operation counts and buffer sizes.</span></div><div class="line"><a name="l00098"></a><span class="lineno"><a class="line" href="a01538.html#a05eef5582eb5de62b76db4916f7adb84"> 98</a></span> <span class="comment"></span> <span class="keyword">typedef</span> ptrdiff_t <a class="code" href="a01538.html#a05eef5582eb5de62b76db4916f7adb84">streamsize</a>; <span class="comment">// Signed integral type</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"></span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> /**</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="comment"> * @brief Class representing stream positions.</span></div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment"> *</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="comment"> * The standard places no requirements upon the template parameter StateT.</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> <span class="comment"> * In this implementation StateT must be DefaultConstructible,</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> <span class="comment"> * CopyConstructible and Assignable. The standard only requires that fpos</span></div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> <span class="comment"> * should contain a member of type StateT. In this implementation it also</span></div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="comment"> * contains an offset stored as a signed integer.</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="comment"> *</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span> <span class="comment"> * @param StateT Type passed to and returned from state().</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span> <span class="comment"> */</span></div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _StateT></div><div class="line"><a name="l00112"></a><span class="lineno"><a class="line" href="a06172.html"> 112</a></span>  <span class="keyword">class </span><a class="code" href="a06172.html">fpos</a></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  {</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keyword">private</span>:</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a> _M_off;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  _StateT _M_state;</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">public</span>:</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">// The standard doesn't require that fpos objects can be default</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">// constructed. This implementation provides a default</span></div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// constructor that initializes the offset to 0 and default</span></div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="comment">// constructs the state.</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <a class="code" href="a06172.html">fpos</a>()</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  : _M_off(0), _M_state() { }</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span> </div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="comment">// The standard requires that fpos objects can be constructed</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// from streamoff objects using the constructor syntax, and</span></div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="comment">// fails to give any meaningful semantics. In this</span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">// implementation implicit conversion is also allowed, and this</span></div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="comment">// constructor stores the streamoff as the offset and default</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="comment">// constructs the state.</span><span class="comment"></span></div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span> <span class="comment"> /// Construct position from offset.</span></div><div class="line"><a name="l00133"></a><span class="lineno"><a class="line" href="a06172.html#a6816aa318c7eeb099c78a3414a2bcdfd"> 133</a></span> <span class="comment"></span> <a class="code" href="a06172.html#a6816aa318c7eeb099c78a3414a2bcdfd">fpos</a>(<a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a> __off)</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  : _M_off(__off), _M_state() { }</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span> <span class="comment"></span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span> <span class="comment"> /// Convert to streamoff.</span></div><div class="line"><a name="l00137"></a><span class="lineno"><a class="line" href="a06172.html#a7da1f1b28792e35537bec6d1bc4feb88"> 137</a></span> <span class="comment"></span> <span class="keyword">operator</span> <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> _M_off; }</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <span class="comment"></span></div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span> <span class="comment"> /// Remember the value of @a st.</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span> <span class="comment"></span> <span class="keywordtype">void</span></div><div class="line"><a name="l00141"></a><span class="lineno"><a class="line" href="a06172.html#a4e97b157edf8205bcc60347a86c9ed86"> 141</a></span>  <a class="code" href="a06172.html#a4e97b157edf8205bcc60347a86c9ed86">state</a>(_StateT __st)</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  { _M_state = __st; }</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="comment"></span></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span> <span class="comment"> /// Return the last set value of @a st.</span></div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> <span class="comment"></span> _StateT</div><div class="line"><a name="l00146"></a><span class="lineno"><a class="line" href="a06172.html#ab0b8ab377a6907428414353bca366234"> 146</a></span>  <a class="code" href="a06172.html#ab0b8ab377a6907428414353bca366234">state</a>()<span class="keyword"> const</span></div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> _M_state; }</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="comment">// The standard requires that this operator must be defined, but</span></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="comment">// gives no semantics. In this implementation it just adds its</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// argument to the stored offset and returns *this.</span><span class="comment"></span></div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="comment"> /// Add offset to this position.</span></div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> <span class="comment"></span> <a class="code" href="a06172.html">fpos</a>&</div><div class="line"><a name="l00154"></a><span class="lineno"><a class="line" href="a06172.html#a82884338bf22e5b2e47088240ee3603c"> 154</a></span>  <a class="code" href="a06172.html#a82884338bf22e5b2e47088240ee3603c">operator+=</a>(<a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a> __off)</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  {</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  _M_off += __off;</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  }</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="comment">// The standard requires that this operator must be defined, but</span></div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="comment">// gives no semantics. In this implementation it just subtracts</span></div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="comment">// its argument from the stored offset and returns *this.</span><span class="comment"></span></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> /// Subtract offset from this position.</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="comment"></span> <a class="code" href="a06172.html">fpos</a>&</div><div class="line"><a name="l00165"></a><span class="lineno"><a class="line" href="a06172.html#af98737e3474e12ecb9d40f19bea2ea9e"> 165</a></span>  <a class="code" href="a06172.html#af98737e3474e12ecb9d40f19bea2ea9e">operator-=</a>(<a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a> __off)</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  {</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  _M_off -= __off;</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  <span class="keywordflow">return</span> *<span class="keyword">this</span>;</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> </div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="comment">// The standard requires that this operator must be defined, but</span></div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="comment">// defines its semantics only in terms of operator-. In this</span></div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="comment">// implementation it constructs a copy of *this, adds the</span></div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="comment">// argument to that copy using operator+= and then returns the</span></div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="comment">// copy.</span><span class="comment"></span></div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span> <span class="comment"> /// Add position and offset.</span></div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span> <span class="comment"></span> <a class="code" href="a06172.html">fpos</a></div><div class="line"><a name="l00178"></a><span class="lineno"><a class="line" href="a06172.html#a6719627d8f502c54e16f321d1790e030"> 178</a></span>  <a class="code" href="a06172.html#a6719627d8f502c54e16f321d1790e030">operator+</a>(<a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a> __off)<span class="keyword"> const</span></div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span> <span class="keyword"> </span>{</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <a class="code" href="a06172.html">fpos</a> __pos(*<span class="keyword">this</span>);</div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  __pos += __off;</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  <span class="keywordflow">return</span> __pos;</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  }</div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span> </div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  <span class="comment">// The standard requires that this operator must be defined, but</span></div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">// defines its semantics only in terms of operator+. In this</span></div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">// implementation it constructs a copy of *this, subtracts the</span></div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="comment">// argument from that copy using operator-= and then returns the</span></div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="comment">// copy.</span><span class="comment"></span></div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="comment"> /// Subtract offset from position.</span></div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="comment"></span> <a class="code" href="a06172.html">fpos</a></div><div class="line"><a name="l00192"></a><span class="lineno"><a class="line" href="a06172.html#af2e0577cdf823db2436ffc2c3e5bf5d5"> 192</a></span>  <a class="code" href="a06172.html#af2e0577cdf823db2436ffc2c3e5bf5d5">operator-</a>(<a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a> __off)<span class="keyword"> const</span></div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span> <span class="keyword"> </span>{</div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <a class="code" href="a06172.html">fpos</a> __pos(*<span class="keyword">this</span>);</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  __pos -= __off;</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordflow">return</span> __pos;</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  }</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span> </div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="comment">// The standard requires that this operator must be defined, but</span></div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="comment">// defines its semantics only in terms of operator+. In this</span></div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="comment">// implementation it returns the difference between the offset</span></div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="comment">// stored in *this and in the argument.</span><span class="comment"></span></div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> /// Subtract position to return offset.</span></div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span> <span class="comment"></span> <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a></div><div class="line"><a name="l00205"></a><span class="lineno"><a class="line" href="a06172.html#a9cb8084ee1bb8395c4a5e7a937092425"> 205</a></span>  <a class="code" href="a06172.html#a9cb8084ee1bb8395c4a5e7a937092425">operator-</a>(<span class="keyword">const</span> <a class="code" href="a06172.html">fpos</a>& __other)<span class="keyword"> const</span></div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span> <span class="keyword"> </span>{ <span class="keywordflow">return</span> _M_off - __other._M_off; }</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">// The standard only requires that operator== must be an</span></div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="comment">// equivalence relation. In this implementation two fpos<StateT></span></div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">// objects belong to the same equivalence class if the contained</span></div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="comment">// offsets compare equal.</span><span class="comment"></span></div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="comment"> /// Test if equivalent to another position.</span></div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span> <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _StateT></div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00216"></a><span class="lineno"><a class="line" href="a01538.html#a50d898f211d37c5a47907f462b0b17f1"> 216</a></span>  operator==(<span class="keyword">const</span> <a class="code" href="a06172.html">fpos<_StateT></a>& __lhs, <span class="keyword">const</span> <a class="code" href="a06172.html">fpos<_StateT></a>& __rhs)</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  { <span class="keywordflow">return</span> <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>(__lhs) == <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>(__rhs); }</div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span> </div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  <span class="keyword">template</span><<span class="keyword">typename</span> _StateT></div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keyword">inline</span> <span class="keywordtype">bool</span></div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  operator!=(<span class="keyword">const</span> fpos<_StateT>& __lhs, <span class="keyword">const</span> fpos<_StateT>& __rhs)</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  { <span class="keywordflow">return</span> <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>(__lhs) != <a class="code" href="a01538.html#a48649c5c32f0251572b366063ee93032">streamoff</a>(__rhs); }</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="comment">// Clauses 21.1.3.1 and 21.1.3.2 describe streampos and wstreampos</span></div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="comment">// as implementation defined types, but clause 27.2 requires that</span></div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <span class="comment">// they must both be typedefs for fpos<mbstate_t></span><span class="comment"></span></div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> /// File position for char streams.</span></div><div class="line"><a name="l00228"></a><span class="lineno"><a class="line" href="a01538.html#a5894cfd4b461e2d4ed3b38402ff59c89"> 228</a></span> <span class="comment"></span> <span class="keyword">typedef</span> <a class="code" href="a06172.html">fpos<mbstate_t></a> <a class="code" href="a01538.html#a5894cfd4b461e2d4ed3b38402ff59c89">streampos</a>;<span class="comment"></span></div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> <span class="comment"> /// File position for wchar_t streams.</span></div><div class="line"><a name="l00230"></a><span class="lineno"><a class="line" href="a01538.html#a4c451a38ccf44b2ce7d8aadf02bb6309"> 230</a></span> <span class="comment"></span> <span class="keyword">typedef</span> <a class="code" href="a06172.html">fpos<mbstate_t></a> <a class="code" href="a01538.html#a4c451a38ccf44b2ce7d8aadf02bb6309">wstreampos</a>;</div><div class="line"><a name="l00231"></a><span class="lineno"> 231</span> </div><div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="preprocessor">#if __cplusplus >= 201103L</span></div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment"> /// File position for char16_t streams.</span></div><div class="line"><a name="l00234"></a><span class="lineno"><a class="line" href="a01538.html#a96c9446fbbc8c9cab8ad5e1447e2d670"> 234</a></span> <span class="comment"></span> <span class="keyword">typedef</span> <a class="code" href="a06172.html">fpos<mbstate_t></a> <a class="code" href="a01538.html#a96c9446fbbc8c9cab8ad5e1447e2d670">u16streampos</a>;<span class="comment"></span></div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment"> /// File position for char32_t streams.</span></div><div class="line"><a name="l00236"></a><span class="lineno"><a class="line" href="a01538.html#a195e60ba4b6b786c2e0182d06c2ebbbb"> 236</a></span> <span class="comment"></span> <span class="keyword">typedef</span> <a class="code" href="a06172.html">fpos<mbstate_t></a> <a class="code" href="a01538.html#a195e60ba4b6b786c2e0182d06c2ebbbb">u32streampos</a>;</div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span> </div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span> _GLIBCXX_END_NAMESPACE_VERSION</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> } <span class="comment">// namespace</span></div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span> </div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="preprocessor">#endif</span></div><div class="ttc" id="a06172_html_a6719627d8f502c54e16f321d1790e030"><div class="ttname"><a href="a06172.html#a6719627d8f502c54e16f321d1790e030">std::fpos::operator+</a></div><div class="ttdeci">fpos operator+(streamoff __off) const</div><div class="ttdoc">Add position and offset.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00178">postypes.h:178</a></div></div>
<div class="ttc" id="a06172_html_ab0b8ab377a6907428414353bca366234"><div class="ttname"><a href="a06172.html#ab0b8ab377a6907428414353bca366234">std::fpos::state</a></div><div class="ttdeci">_StateT state() const</div><div class="ttdoc">Return the last set value of st.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00146">postypes.h:146</a></div></div>
<div class="ttc" id="a01538_html_a48649c5c32f0251572b366063ee93032"><div class="ttname"><a href="a01538.html#a48649c5c32f0251572b366063ee93032">std::streamoff</a></div><div class="ttdeci">long long streamoff</div><div class="ttdoc">Type used by fpos, char_traits<char>, and char_traits<wchar_t>.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00094">postypes.h:94</a></div></div>
<div class="ttc" id="a01538_html_a4c451a38ccf44b2ce7d8aadf02bb6309"><div class="ttname"><a href="a01538.html#a4c451a38ccf44b2ce7d8aadf02bb6309">std::wstreampos</a></div><div class="ttdeci">fpos< mbstate_t > wstreampos</div><div class="ttdoc">File position for wchar_t streams.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00230">postypes.h:230</a></div></div>
<div class="ttc" id="a06172_html_af2e0577cdf823db2436ffc2c3e5bf5d5"><div class="ttname"><a href="a06172.html#af2e0577cdf823db2436ffc2c3e5bf5d5">std::fpos::operator-</a></div><div class="ttdeci">fpos operator-(streamoff __off) const</div><div class="ttdoc">Subtract offset from position.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00192">postypes.h:192</a></div></div>
<div class="ttc" id="a06172_html_a4e97b157edf8205bcc60347a86c9ed86"><div class="ttname"><a href="a06172.html#a4e97b157edf8205bcc60347a86c9ed86">std::fpos::state</a></div><div class="ttdeci">void state(_StateT __st)</div><div class="ttdoc">Remember the value of st.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00141">postypes.h:141</a></div></div>
<div class="ttc" id="a06172_html_a9cb8084ee1bb8395c4a5e7a937092425"><div class="ttname"><a href="a06172.html#a9cb8084ee1bb8395c4a5e7a937092425">std::fpos::operator-</a></div><div class="ttdeci">streamoff operator-(const fpos &__other) const</div><div class="ttdoc">Subtract position to return offset.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00205">postypes.h:205</a></div></div>
<div class="ttc" id="a01538_html_a5894cfd4b461e2d4ed3b38402ff59c89"><div class="ttname"><a href="a01538.html#a5894cfd4b461e2d4ed3b38402ff59c89">std::streampos</a></div><div class="ttdeci">fpos< mbstate_t > streampos</div><div class="ttdoc">File position for char streams.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00228">postypes.h:228</a></div></div>
<div class="ttc" id="a06172_html_a82884338bf22e5b2e47088240ee3603c"><div class="ttname"><a href="a06172.html#a82884338bf22e5b2e47088240ee3603c">std::fpos::operator+=</a></div><div class="ttdeci">fpos & operator+=(streamoff __off)</div><div class="ttdoc">Add offset to this position.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00154">postypes.h:154</a></div></div>
<div class="ttc" id="a06172_html_af98737e3474e12ecb9d40f19bea2ea9e"><div class="ttname"><a href="a06172.html#af98737e3474e12ecb9d40f19bea2ea9e">std::fpos::operator-=</a></div><div class="ttdeci">fpos & operator-=(streamoff __off)</div><div class="ttdoc">Subtract offset from this position.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00165">postypes.h:165</a></div></div>
<div class="ttc" id="a06172_html_a6816aa318c7eeb099c78a3414a2bcdfd"><div class="ttname"><a href="a06172.html#a6816aa318c7eeb099c78a3414a2bcdfd">std::fpos::fpos</a></div><div class="ttdeci">fpos(streamoff __off)</div><div class="ttdoc">Construct position from offset.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00133">postypes.h:133</a></div></div>
<div class="ttc" id="a01538_html"><div class="ttname"><a href="a01538.html">std</a></div><div class="ttdoc">ISO C++ entities toplevel namespace is std.</div></div>
<div class="ttc" id="a06172_html"><div class="ttname"><a href="a06172.html">std::fpos</a></div><div class="ttdoc">Class representing stream positions.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00112">postypes.h:112</a></div></div>
<div class="ttc" id="a00254_html"><div class="ttname"><a href="a00254.html">cwchar</a></div></div>
<div class="ttc" id="a01538_html_a96c9446fbbc8c9cab8ad5e1447e2d670"><div class="ttname"><a href="a01538.html#a96c9446fbbc8c9cab8ad5e1447e2d670">std::u16streampos</a></div><div class="ttdeci">fpos< mbstate_t > u16streampos</div><div class="ttdoc">File position for char16_t streams.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00234">postypes.h:234</a></div></div>
<div class="ttc" id="a01538_html_a195e60ba4b6b786c2e0182d06c2ebbbb"><div class="ttname"><a href="a01538.html#a195e60ba4b6b786c2e0182d06c2ebbbb">std::u32streampos</a></div><div class="ttdeci">fpos< mbstate_t > u32streampos</div><div class="ttdoc">File position for char32_t streams.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00236">postypes.h:236</a></div></div>
<div class="ttc" id="a01538_html_a05eef5582eb5de62b76db4916f7adb84"><div class="ttname"><a href="a01538.html#a05eef5582eb5de62b76db4916f7adb84">std::streamsize</a></div><div class="ttdeci">ptrdiff_t streamsize</div><div class="ttdoc">Integral type for I/O operation counts and buffer sizes.</div><div class="ttdef"><b>Definition:</b> <a href="a00440_source.html#l00098">postypes.h:98</a></div></div>
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