<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<title>libstdc++: debug_allocator.h Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript">
$(document).ready(initResizable);
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<!-- Generated by Doxygen 1.7.4 -->
<div id="top">
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td style="padding-left: 0.5em;">
<div id="projectname">libstdc++</div>
</td>
</tr>
</tbody>
</table>
</div>
</div>
<div id="side-nav" class="ui-resizable side-nav-resizable">
<div id="nav-tree">
<div id="nav-tree-contents">
</div>
</div>
<div id="splitbar" style="-moz-user-select:none;"
class="ui-resizable-handle">
</div>
</div>
<script type="text/javascript">
initNavTree('a00852.html','');
</script>
<div id="doc-content">
<div class="header">
<div class="headertitle">
<div class="title">debug_allocator.h</div> </div>
</div>
<div class="contents">
<a href="a00852.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, 2009, 2010</span>
<a name="l00004"></a>00004 <span class="comment">// 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 ext/debug_allocator.h</span>
<a name="l00040"></a>00040 <span class="comment"> * This file is a GNU extension to the Standard C++ Library.</span>
<a name="l00041"></a>00041 <span class="comment"> */</span>
<a name="l00042"></a>00042
<a name="l00043"></a>00043 <span class="preprocessor">#ifndef _DEBUG_ALLOCATOR_H</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span><span class="preprocessor">#define _DEBUG_ALLOCATOR_H 1</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span>
<a name="l00046"></a>00046 <span class="preprocessor">#include <<a class="code" href="a01041.html">stdexcept</a>></span>
<a name="l00047"></a>00047
<a name="l00048"></a>00048 <span class="keyword">namespace </span>__gnu_cxx _GLIBCXX_VISIBILITY(default)
<a name="l00049"></a>00049 {
<a name="l00050"></a>00050 _GLIBCXX_BEGIN_NAMESPACE_VERSION
<a name="l00051"></a>00051
<a name="l00052"></a>00052 <span class="keyword">using</span> std::size_t;
<a name="l00053"></a>00053 <span class="comment"></span>
<a name="l00054"></a>00054 <span class="comment"> /**</span>
<a name="l00055"></a>00055 <span class="comment"> * @brief A meta-allocator with debugging bits, as per [20.4].</span>
<a name="l00056"></a>00056 <span class="comment"> * @ingroup allocators</span>
<a name="l00057"></a>00057 <span class="comment"> *</span>
<a name="l00058"></a>00058 <span class="comment"> * This is precisely the allocator defined in the C++ Standard. </span>
<a name="l00059"></a>00059 <span class="comment"> * - all allocation calls operator new</span>
<a name="l00060"></a>00060 <span class="comment"> * - all deallocation calls operator delete</span>
<a name="l00061"></a>00061 <span class="comment"> */</span>
<a name="l00062"></a>00062 <span class="keyword">template</span><<span class="keyword">typename</span> _Alloc>
<a name="l00063"></a><a class="code" href="a00040.html">00063</a> <span class="keyword">class </span><a class="code" href="a00040.html" title="A meta-allocator with debugging bits, as per [20.4].This is precisely the allocator defined in the C+...">debug_allocator</a>
<a name="l00064"></a>00064 {
<a name="l00065"></a>00065 <span class="keyword">public</span>:
<a name="l00066"></a>00066 <span class="keyword">typedef</span> <span class="keyword">typename</span> _Alloc::size_type size_type;
<a name="l00067"></a>00067 <span class="keyword">typedef</span> <span class="keyword">typename</span> _Alloc::difference_type difference_type;
<a name="l00068"></a>00068 <span class="keyword">typedef</span> <span class="keyword">typename</span> _Alloc::pointer pointer;
<a name="l00069"></a>00069 <span class="keyword">typedef</span> <span class="keyword">typename</span> _Alloc::const_pointer const_pointer;
<a name="l00070"></a>00070 <span class="keyword">typedef</span> <span class="keyword">typename</span> _Alloc::reference reference;
<a name="l00071"></a>00071 <span class="keyword">typedef</span> <span class="keyword">typename</span> _Alloc::const_reference const_reference;
<a name="l00072"></a>00072 <span class="keyword">typedef</span> <span class="keyword">typename</span> _Alloc::value_type value_type;
<a name="l00073"></a>00073
<a name="l00074"></a>00074 <span class="keyword">private</span>:
<a name="l00075"></a>00075 <span class="comment">// _M_extra is the number of objects that correspond to the</span>
<a name="l00076"></a>00076 <span class="comment">// extra space where debug information is stored.</span>
<a name="l00077"></a>00077 size_type _M_extra;
<a name="l00078"></a>00078
<a name="l00079"></a>00079 _Alloc _M_allocator;
<a name="l00080"></a>00080
<a name="l00081"></a>00081 <span class="keyword">public</span>:
<a name="l00082"></a>00082 <a class="code" href="a00040.html" title="A meta-allocator with debugging bits, as per [20.4].This is precisely the allocator defined in the C+...">debug_allocator</a>()
<a name="l00083"></a>00083 {
<a name="l00084"></a>00084 <span class="keyword">const</span> <span class="keywordtype">size_t</span> __obj_size = <span class="keyword">sizeof</span>(value_type);
<a name="l00085"></a>00085 _M_extra = (<span class="keyword">sizeof</span>(size_type) + __obj_size - 1) / __obj_size;
<a name="l00086"></a>00086 }
<a name="l00087"></a>00087
<a name="l00088"></a>00088 pointer
<a name="l00089"></a>00089 allocate(size_type __n)
<a name="l00090"></a>00090 {
<a name="l00091"></a>00091 pointer __res = _M_allocator.allocate(__n + _M_extra);
<a name="l00092"></a>00092 size_type* __ps = <span class="keyword">reinterpret_cast<</span>size_type*<span class="keyword">></span>(__res);
<a name="l00093"></a>00093 *__ps = __n;
<a name="l00094"></a>00094 <span class="keywordflow">return</span> __res + _M_extra;
<a name="l00095"></a>00095 }
<a name="l00096"></a>00096
<a name="l00097"></a>00097 pointer
<a name="l00098"></a>00098 allocate(size_type __n, <span class="keyword">const</span> <span class="keywordtype">void</span>* __hint)
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 pointer __res = _M_allocator.allocate(__n + _M_extra, __hint);
<a name="l00101"></a>00101 size_type* __ps = <span class="keyword">reinterpret_cast<</span>size_type*<span class="keyword">></span>(__res);
<a name="l00102"></a>00102 *__ps = __n;
<a name="l00103"></a>00103 <span class="keywordflow">return</span> __res + _M_extra;
<a name="l00104"></a>00104 }
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="keywordtype">void</span>
<a name="l00107"></a>00107 deallocate(pointer __p, size_type __n)
<a name="l00108"></a>00108 {
<a name="l00109"></a>00109 <span class="keywordflow">if</span> (__p)
<a name="l00110"></a>00110 {
<a name="l00111"></a>00111 pointer __real_p = __p - _M_extra;
<a name="l00112"></a>00112 <span class="keywordflow">if</span> (*reinterpret_cast<size_type*>(__real_p) != __n)
<a name="l00113"></a>00113 {
<a name="l00114"></a>00114 <span class="keywordflow">throw</span> <a class="code" href="a00694.html" title="One of two subclasses of exception.">std::runtime_error</a>(<span class="stringliteral">"debug_allocator::deallocate"</span>
<a name="l00115"></a>00115 <span class="stringliteral">" wrong size"</span>);
<a name="l00116"></a>00116 }
<a name="l00117"></a>00117 _M_allocator.deallocate(__real_p, __n + _M_extra);
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119 <span class="keywordflow">else</span>
<a name="l00120"></a>00120 <span class="keywordflow">throw</span> <a class="code" href="a00694.html" title="One of two subclasses of exception.">std::runtime_error</a>(<span class="stringliteral">"debug_allocator::deallocate null pointer"</span>);
<a name="l00121"></a>00121 }
<a name="l00122"></a>00122 };
<a name="l00123"></a>00123
<a name="l00124"></a>00124 _GLIBCXX_END_NAMESPACE_VERSION
<a name="l00125"></a>00125 } <span class="comment">// namespace</span>
<a name="l00126"></a>00126
<a name="l00127"></a>00127 <span class="preprocessor">#endif</span>
</pre></div></div>
</div>
<div id="nav-path" class="navpath">
<ul>
<li class="navelem"><a class="el" href="a00852.html">debug_allocator.h</a> </li>
<li class="footer">Generated by 
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.4 </li>
</ul>
</div>
</body>
</html>
