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<a href="a00751.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// Allocators -*- C++ -*-</span>
<a name="l00002"></a>00002
<a name="l00003"></a>00003 <span class="comment">// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,</span>
<a name="l00004"></a>00004 <span class="comment">// 2011 Free Software Foundation, Inc.</span>
<a name="l00005"></a>00005 <span class="comment">//</span>
<a name="l00006"></a>00006 <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span>
<a name="l00007"></a>00007 <span class="comment">// software; you can redistribute it and/or modify it under the</span>
<a name="l00008"></a>00008 <span class="comment">// terms of the GNU General Public License as published by the</span>
<a name="l00009"></a>00009 <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span>
<a name="l00010"></a>00010 <span class="comment">// any later version.</span>
<a name="l00011"></a>00011
<a name="l00012"></a>00012 <span class="comment">// This library is distributed in the hope that it will be useful,</span>
<a name="l00013"></a>00013 <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00014"></a>00014 <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00015"></a>00015 <span class="comment">// GNU General Public License for more details.</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span>
<a name="l00018"></a>00018 <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span>
<a name="l00019"></a>00019 <span class="comment">// 3.1, as published by the Free Software Foundation.</span>
<a name="l00020"></a>00020
<a name="l00021"></a>00021 <span class="comment">// You should have received a copy of the GNU General Public License and</span>
<a name="l00022"></a>00022 <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span>
<a name="l00023"></a>00023 <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span>
<a name="l00024"></a>00024 <span class="comment">// <http://www.gnu.org/licenses/>.</span>
<a name="l00025"></a>00025
<a name="l00026"></a>00026 <span class="comment">/*</span>
<a name="l00027"></a>00027 <span class="comment"> * Copyright (c) 1996-1997</span>
<a name="l00028"></a>00028 <span class="comment"> * Silicon Graphics Computer Systems, Inc.</span>
<a name="l00029"></a>00029 <span class="comment"> *</span>
<a name="l00030"></a>00030 <span class="comment"> * Permission to use, copy, modify, distribute and sell this software</span>
<a name="l00031"></a>00031 <span class="comment"> * and its documentation for any purpose is hereby granted without fee,</span>
<a name="l00032"></a>00032 <span class="comment"> * provided that the above copyright notice appear in all copies and</span>
<a name="l00033"></a>00033 <span class="comment"> * that both that copyright notice and this permission notice appear</span>
<a name="l00034"></a>00034 <span class="comment"> * in supporting documentation. Silicon Graphics makes no</span>
<a name="l00035"></a>00035 <span class="comment"> * representations about the suitability of this software for any</span>
<a name="l00036"></a>00036 <span class="comment"> * purpose. It is provided "as is" without express or implied warranty.</span>
<a name="l00037"></a>00037 <span class="comment"> */</span>
<a name="l00038"></a>00038 <span class="comment"></span>
<a name="l00039"></a>00039 <span class="comment">/** @file bits/allocator.h</span>
<a name="l00040"></a>00040 <span class="comment"> * This is an internal header file, included by other library headers.</span>
<a name="l00041"></a>00041 <span class="comment"> * Do not attempt to use it directly. @headername{memory}</span>
<a name="l00042"></a>00042 <span class="comment"> */</span>
<a name="l00043"></a>00043
<a name="l00044"></a>00044 <span class="preprocessor">#ifndef _ALLOCATOR_H</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span><span class="preprocessor">#define _ALLOCATOR_H 1</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span>
<a name="l00047"></a>00047 <span class="comment">// Define the base class to std::allocator.</span>
<a name="l00048"></a>00048 <span class="preprocessor">#include <<a class="code" href="a00780.html">bits/c++allocator.h</a>></span>
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="preprocessor">#ifdef __GXX_EXPERIMENTAL_CXX0X__</span>
<a name="l00051"></a>00051 <span class="preprocessor"></span><span class="preprocessor">#include <<a class="code" href="a01090.html">type_traits</a>></span> <span class="comment">// For _GLIBCXX_HAS_NESTED_TYPE</span>
<a name="l00052"></a>00052 <span class="preprocessor">#endif</span>
<a name="l00053"></a>00053 <span class="preprocessor"></span>
<a name="l00054"></a>00054 <span class="keyword">namespace </span>std _GLIBCXX_VISIBILITY(default)
<a name="l00055"></a>00055 {
<a name="l00056"></a>00056 _GLIBCXX_BEGIN_NAMESPACE_VERSION
<a name="l00057"></a>00057 <span class="comment"></span>
<a name="l00058"></a>00058 <span class="comment"> /**</span>
<a name="l00059"></a>00059 <span class="comment"> * @defgroup allocators Allocators</span>
<a name="l00060"></a>00060 <span class="comment"> * @ingroup memory</span>
<a name="l00061"></a>00061 <span class="comment"> *</span>
<a name="l00062"></a>00062 <span class="comment"> * Classes encapsulating memory operations.</span>
<a name="l00063"></a>00063 <span class="comment"> */</span>
<a name="l00064"></a>00064
<a name="l00065"></a>00065 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp>
<a name="l00066"></a>00066 <span class="keyword">class </span>allocator;
<a name="l00067"></a>00067 <span class="comment"></span>
<a name="l00068"></a>00068 <span class="comment"> /// allocator<void> specialization.</span>
<a name="l00069"></a>00069 <span class="comment"></span> <span class="keyword">template</span><>
<a name="l00070"></a><a class="code" href="a00365.html">00070</a> <span class="keyword">class </span><a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator</a><void>
<a name="l00071"></a>00071 {
<a name="l00072"></a>00072 <span class="keyword">public</span>:
<a name="l00073"></a>00073 <span class="keyword">typedef</span> <span class="keywordtype">size_t</span> size_type;
<a name="l00074"></a>00074 <span class="keyword">typedef</span> ptrdiff_t difference_type;
<a name="l00075"></a>00075 <span class="keyword">typedef</span> <span class="keywordtype">void</span>* pointer;
<a name="l00076"></a>00076 <span class="keyword">typedef</span> <span class="keyword">const</span> <span class="keywordtype">void</span>* const_pointer;
<a name="l00077"></a>00077 <span class="keyword">typedef</span> <span class="keywordtype">void</span> value_type;
<a name="l00078"></a>00078
<a name="l00079"></a>00079 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1>
<a name="l00080"></a>00080 <span class="keyword">struct </span>rebind
<a name="l00081"></a>00081 { <span class="keyword">typedef</span> <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator<_Tp1></a> other; };
<a name="l00082"></a>00082 };
<a name="l00083"></a>00083 <span class="comment"></span>
<a name="l00084"></a>00084 <span class="comment"> /**</span>
<a name="l00085"></a>00085 <span class="comment"> * @brief The @a standard allocator, as per [20.4].</span>
<a name="l00086"></a>00086 <span class="comment"> * @ingroup allocators</span>
<a name="l00087"></a>00087 <span class="comment"> *</span>
<a name="l00088"></a>00088 <span class="comment"> * Further details:</span>
<a name="l00089"></a>00089 <span class="comment"> * http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt04ch11.html</span>
<a name="l00090"></a>00090 <span class="comment"> */</span>
<a name="l00091"></a>00091 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp>
<a name="l00092"></a><a class="code" href="a00246.html">00092</a> <span class="keyword">class </span><a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator</a>: <span class="keyword">public</span> __glibcxx_base_allocator<_Tp>
<a name="l00093"></a>00093 {
<a name="l00094"></a>00094 <span class="keyword">public</span>:
<a name="l00095"></a>00095 <span class="keyword">typedef</span> <span class="keywordtype">size_t</span> size_type;
<a name="l00096"></a>00096 <span class="keyword">typedef</span> ptrdiff_t difference_type;
<a name="l00097"></a>00097 <span class="keyword">typedef</span> _Tp* pointer;
<a name="l00098"></a>00098 <span class="keyword">typedef</span> <span class="keyword">const</span> _Tp* const_pointer;
<a name="l00099"></a>00099 <span class="keyword">typedef</span> _Tp& reference;
<a name="l00100"></a>00100 <span class="keyword">typedef</span> <span class="keyword">const</span> _Tp& const_reference;
<a name="l00101"></a>00101 <span class="keyword">typedef</span> _Tp value_type;
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1>
<a name="l00104"></a>00104 <span class="keyword">struct </span>rebind
<a name="l00105"></a>00105 { <span class="keyword">typedef</span> <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator<_Tp1></a> other; };
<a name="l00106"></a>00106
<a name="l00107"></a>00107 <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator</a>() <span class="keywordflow">throw</span>() { }
<a name="l00108"></a>00108
<a name="l00109"></a>00109 <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator</a>(<span class="keyword">const</span> <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator</a>& __a) <span class="keywordflow">throw</span>()
<a name="l00110"></a>00110 : __glibcxx_base_allocator<_Tp>(__a) { }
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp1>
<a name="l00113"></a>00113 <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator</a>(<span class="keyword">const</span> <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator<_Tp1></a>&) <span class="keywordflow">throw</span>() { }
<a name="l00114"></a>00114
<a name="l00115"></a>00115 ~<a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator</a>() <span class="keywordflow">throw</span>() { }
<a name="l00116"></a>00116
<a name="l00117"></a>00117 <span class="comment">// Inherit everything else.</span>
<a name="l00118"></a>00118 };
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="keyword">template</span><<span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2>
<a name="l00121"></a>00121 <span class="keyword">inline</span> <span class="keywordtype">bool</span>
<a name="l00122"></a>00122 operator==(<span class="keyword">const</span> <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator<_T1></a>&, <span class="keyword">const</span> <a class="code" href="a00246.html" title="The standard allocator, as per [20.4].Further details: http://gcc.gnu.org/onlinedocs/libstdc++/manual...">allocator<_T2></a>&)
<a name="l00123"></a>00123 { <span class="keywordflow">return</span> <span class="keyword">true</span>; }
<a name="l00124"></a>00124
<a name="l00125"></a>00125 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp>
<a name="l00126"></a>00126 <span class="keyword">inline</span> <span class="keywordtype">bool</span>
<a name="l00127"></a>00127 operator==(<span class="keyword">const</span> allocator<_Tp>&, <span class="keyword">const</span> allocator<_Tp>&)
<a name="l00128"></a>00128 { <span class="keywordflow">return</span> <span class="keyword">true</span>; }
<a name="l00129"></a>00129
<a name="l00130"></a>00130 <span class="keyword">template</span><<span class="keyword">typename</span> _T1, <span class="keyword">typename</span> _T2>
<a name="l00131"></a>00131 <span class="keyword">inline</span> <span class="keywordtype">bool</span>
<a name="l00132"></a>00132 operator!=(<span class="keyword">const</span> allocator<_T1>&, <span class="keyword">const</span> allocator<_T2>&)
<a name="l00133"></a>00133 { <span class="keywordflow">return</span> <span class="keyword">false</span>; }
<a name="l00134"></a>00134
<a name="l00135"></a>00135 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp>
<a name="l00136"></a>00136 <span class="keyword">inline</span> <span class="keywordtype">bool</span>
<a name="l00137"></a>00137 operator!=(<span class="keyword">const</span> allocator<_Tp>&, <span class="keyword">const</span> allocator<_Tp>&)
<a name="l00138"></a>00138 { <span class="keywordflow">return</span> <span class="keyword">false</span>; }
<a name="l00139"></a>00139
<a name="l00140"></a>00140 <span class="comment">// Inhibit implicit instantiations for required instantiations,</span>
<a name="l00141"></a>00141 <span class="comment">// which are defined via explicit instantiations elsewhere.</span>
<a name="l00142"></a>00142 <span class="preprocessor">#if _GLIBCXX_EXTERN_TEMPLATE</span>
<a name="l00143"></a>00143 <span class="preprocessor"></span> <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>allocator<char>;
<a name="l00144"></a>00144 <span class="keyword">extern</span> <span class="keyword">template</span> <span class="keyword">class </span>allocator<wchar_t>;
<a name="l00145"></a>00145 <span class="preprocessor">#endif</span>
<a name="l00146"></a>00146 <span class="preprocessor"></span>
<a name="l00147"></a>00147 <span class="comment">// Undefine.</span>
<a name="l00148"></a>00148 <span class="preprocessor">#undef __glibcxx_base_allocator</span>
<a name="l00149"></a>00149 <span class="preprocessor"></span>
<a name="l00150"></a>00150 <span class="comment">// To implement Option 3 of DR 431.</span>
<a name="l00151"></a>00151 <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc, <span class="keywordtype">bool</span> = __is_empty(_Alloc)>
<a name="l00152"></a>00152 <span class="keyword">struct </span>__alloc_swap
<a name="l00153"></a>00153 { <span class="keyword">static</span> <span class="keywordtype">void</span> _S_do_it(_Alloc&, _Alloc&) { } };
<a name="l00154"></a>00154
<a name="l00155"></a>00155 <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc>
<a name="l00156"></a>00156 <span class="keyword">struct </span>__alloc_swap<_Alloc, false>
<a name="l00157"></a>00157 {
<a name="l00158"></a>00158 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00159"></a>00159 _S_do_it(_Alloc& __one, _Alloc& __two)
<a name="l00160"></a>00160 {
<a name="l00161"></a>00161 <span class="comment">// Precondition: swappable allocators.</span>
<a name="l00162"></a>00162 <span class="keywordflow">if</span> (__one != __two)
<a name="l00163"></a>00163 swap(__one, __two);
<a name="l00164"></a>00164 }
<a name="l00165"></a>00165 };
<a name="l00166"></a>00166
<a name="l00167"></a>00167 <span class="comment">// Optimize for stateless allocators.</span>
<a name="l00168"></a>00168 <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc, <span class="keywordtype">bool</span> = __is_empty(_Alloc)>
<a name="l00169"></a>00169 <span class="keyword">struct </span>__alloc_neq
<a name="l00170"></a>00170 {
<a name="l00171"></a>00171 <span class="keyword">static</span> <span class="keywordtype">bool</span>
<a name="l00172"></a>00172 _S_do_it(<span class="keyword">const</span> _Alloc&, <span class="keyword">const</span> _Alloc&)
<a name="l00173"></a>00173 { <span class="keywordflow">return</span> <span class="keyword">false</span>; }
<a name="l00174"></a>00174 };
<a name="l00175"></a>00175
<a name="l00176"></a>00176 <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc>
<a name="l00177"></a>00177 <span class="keyword">struct </span>__alloc_neq<_Alloc, false>
<a name="l00178"></a>00178 {
<a name="l00179"></a>00179 <span class="keyword">static</span> <span class="keywordtype">bool</span>
<a name="l00180"></a>00180 _S_do_it(<span class="keyword">const</span> _Alloc& __one, <span class="keyword">const</span> _Alloc& __two)
<a name="l00181"></a>00181 { <span class="keywordflow">return</span> __one != __two; }
<a name="l00182"></a>00182 };
<a name="l00183"></a>00183
<a name="l00184"></a>00184 <span class="preprocessor">#ifdef __GXX_EXPERIMENTAL_CXX0X__</span>
<a name="l00185"></a>00185 <span class="preprocessor"></span> <span class="comment">// A very basic implementation for now. In general we have to wait for</span>
<a name="l00186"></a>00186 <span class="comment">// the availability of the infrastructure described in N2983: we should</span>
<a name="l00187"></a>00187 <span class="comment">// try when either T has a move constructor which cannot throw or T is</span>
<a name="l00188"></a>00188 <span class="comment">// CopyContructible.</span>
<a name="l00189"></a>00189 <span class="comment">// NB: This code doesn't properly belong here, we should find a more</span>
<a name="l00190"></a>00190 <span class="comment">// suited place common to std::vector and std::deque.</span>
<a name="l00191"></a>00191 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp,
<a name="l00192"></a>00192 <span class="keywordtype">bool</span> = __has_trivial_copy(<span class="keyword">typename</span> _Tp::value_type)>
<a name="l00193"></a>00193 <span class="keyword">struct </span>__shrink_to_fit
<a name="l00194"></a>00194 { <span class="keyword">static</span> <span class="keywordtype">void</span> _S_do_it(_Tp&) { } };
<a name="l00195"></a>00195
<a name="l00196"></a>00196 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp>
<a name="l00197"></a>00197 <span class="keyword">struct </span>__shrink_to_fit<_Tp, true>
<a name="l00198"></a>00198 {
<a name="l00199"></a>00199 <span class="keyword">static</span> <span class="keywordtype">void</span>
<a name="l00200"></a>00200 _S_do_it(_Tp& __v)
<a name="l00201"></a>00201 {
<a name="l00202"></a>00202 __try
<a name="l00203"></a>00203 { _Tp(__v).swap(__v); }
<a name="l00204"></a>00204 __catch(...) { }
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 };
<a name="l00207"></a>00207
<a name="l00208"></a>00208 <span class="comment"></span>
<a name="l00209"></a>00209 <span class="comment"> /// [allocator.tag]</span>
<a name="l00210"></a><a class="code" href="a00366.html">00210</a> <span class="comment"></span> <span class="keyword">struct </span><a class="code" href="a00366.html" title="[allocator.tag]">allocator_arg_t</a> { };
<a name="l00211"></a>00211
<a name="l00212"></a>00212 constexpr <a class="code" href="a00366.html" title="[allocator.tag]">allocator_arg_t</a> allocator_arg = <a class="code" href="a00366.html" title="[allocator.tag]">allocator_arg_t</a>();
<a name="l00213"></a>00213
<a name="l00214"></a>00214 <a class="code" href="a01205.html#ga5483c2bfe929a5938ce633f378db2d55">_GLIBCXX_HAS_NESTED_TYPE</a>(allocator_type)
<a name="l00215"></a>00215
<a name="l00216"></a>00216 template<typename _Tp, typename _Alloc,
<a name="l00217"></a>00217 <span class="keywordtype">bool</span> = __has_allocator_type<_Tp>::value>
<a name="l00218"></a>00218 struct __uses_allocator_helper
<a name="l00219"></a>00219 : public <a class="code" href="a00257.html">false_type</a> { };
<a name="l00220"></a>00220
<a name="l00221"></a>00221 <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Alloc>
<a name="l00222"></a>00222 <span class="keyword">struct </span>__uses_allocator_helper<_Tp, _Alloc, true>
<a name="l00223"></a>00223 : <span class="keyword">public</span> integral_constant<bool, is_convertible<_Alloc,
<a name="l00224"></a>00224 typename _Tp::allocator_type>::value>
<a name="l00225"></a>00225 { };
<a name="l00226"></a>00226 <span class="comment"></span>
<a name="l00227"></a>00227 <span class="comment"> /// [allocator.uses.trait]</span>
<a name="l00228"></a>00228 <span class="comment"></span> <span class="keyword">template</span><<span class="keyword">typename</span> _Tp, <span class="keyword">typename</span> _Alloc>
<a name="l00229"></a><a class="code" href="a00737.html">00229</a> <span class="keyword">struct </span><a class="code" href="a00737.html" title="[allocator.uses.trait]">uses_allocator</a>
<a name="l00230"></a>00230 : <span class="keyword">public</span> <a class="code" href="a00257.html" title="integral_constant">integral_constant</a><bool,
<a name="l00231"></a>00231 __uses_allocator_helper<_Tp, _Alloc>::value>
<a name="l00232"></a>00232 { };
<a name="l00233"></a>00233
<a name="l00234"></a>00234 <span class="preprocessor">#endif</span>
<a name="l00235"></a>00235 <span class="preprocessor"></span>
<a name="l00236"></a>00236 _GLIBCXX_END_NAMESPACE_VERSION
<a name="l00237"></a>00237 } <span class="comment">// namespace std</span>
<a name="l00238"></a>00238
<a name="l00239"></a>00239 <span class="preprocessor">#endif</span>
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