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<a href="a00786.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// <cast.h> -*- C++ -*-</span>
<a name="l00002"></a>00002
<a name="l00003"></a>00003 <span class="comment">// Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.</span>
<a name="l00004"></a>00004 <span class="comment">//</span>
<a name="l00005"></a>00005 <span class="comment">// This file is part of the GNU ISO C++ Library. This library is free</span>
<a name="l00006"></a>00006 <span class="comment">// software; you can redistribute it and/or modify it under the</span>
<a name="l00007"></a>00007 <span class="comment">// terms of the GNU General Public License as published by the</span>
<a name="l00008"></a>00008 <span class="comment">// Free Software Foundation; either version 3, or (at your option)</span>
<a name="l00009"></a>00009 <span class="comment">// any later version.</span>
<a name="l00010"></a>00010
<a name="l00011"></a>00011 <span class="comment">// This library is distributed in the hope that it will be useful,</span>
<a name="l00012"></a>00012 <span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00013"></a>00013 <span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span>
<a name="l00014"></a>00014 <span class="comment">// GNU General Public License for more details.</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016 <span class="comment">// Under Section 7 of GPL version 3, you are granted additional</span>
<a name="l00017"></a>00017 <span class="comment">// permissions described in the GCC Runtime Library Exception, version</span>
<a name="l00018"></a>00018 <span class="comment">// 3.1, as published by the Free Software Foundation.</span>
<a name="l00019"></a>00019
<a name="l00020"></a>00020 <span class="comment">// You should have received a copy of the GNU General Public License and</span>
<a name="l00021"></a>00021 <span class="comment">// a copy of the GCC Runtime Library Exception along with this program;</span>
<a name="l00022"></a>00022 <span class="comment">// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see</span>
<a name="l00023"></a>00023 <span class="comment">// <http://www.gnu.org/licenses/>.</span>
<a name="l00024"></a>00024 <span class="comment"></span>
<a name="l00025"></a>00025 <span class="comment">/** @file ext/cast.h</span>
<a name="l00026"></a>00026 <span class="comment"> * This is an internal header file, included by other library headers.</span>
<a name="l00027"></a>00027 <span class="comment"> * Do not attempt to use it directly. @headername{ext/pointer.h}</span>
<a name="l00028"></a>00028 <span class="comment"> */</span>
<a name="l00029"></a>00029
<a name="l00030"></a>00030 <span class="preprocessor">#ifndef _GLIBCXX_CAST_H</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#define _GLIBCXX_CAST_H 1</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span>
<a name="l00033"></a>00033 <span class="keyword">namespace </span>__gnu_cxx _GLIBCXX_VISIBILITY(default)
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035 _GLIBCXX_BEGIN_NAMESPACE_VERSION
<a name="l00036"></a>00036 <span class="comment"></span>
<a name="l00037"></a>00037 <span class="comment"> /**</span>
<a name="l00038"></a>00038 <span class="comment"> * These functions are here to allow containers to support non standard</span>
<a name="l00039"></a>00039 <span class="comment"> * pointer types. For normal pointers, these resolve to the use of the</span>
<a name="l00040"></a>00040 <span class="comment"> * standard cast operation. For other types the functions will perform</span>
<a name="l00041"></a>00041 <span class="comment"> * the apprpriate cast to/from the custom pointer class so long as that</span>
<a name="l00042"></a>00042 <span class="comment"> * class meets the following conditions:</span>
<a name="l00043"></a>00043 <span class="comment"> * 1) has a typedef element_type which names tehe type it points to.</span>
<a name="l00044"></a>00044 <span class="comment"> * 2) has a get() const method which returns element_type*.</span>
<a name="l00045"></a>00045 <span class="comment"> * 3) has a constructor which can take one element_type* argument.</span>
<a name="l00046"></a>00046 <span class="comment"> */</span>
<a name="l00047"></a>00047 <span class="comment"></span>
<a name="l00048"></a>00048 <span class="comment"> /**</span>
<a name="l00049"></a>00049 <span class="comment"> * This type supports the semantics of the pointer cast operators (below.)</span>
<a name="l00050"></a>00050 <span class="comment"> */</span>
<a name="l00051"></a>00051 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType>
<a name="l00052"></a><a class="code" href="a00020.html">00052</a> <span class="keyword">struct </span><a class="code" href="a00020.html">_Caster</a>
<a name="l00053"></a>00053 { <span class="keyword">typedef</span> <span class="keyword">typename</span> _ToType::element_type* type; };
<a name="l00054"></a>00054
<a name="l00055"></a>00055 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType>
<a name="l00056"></a>00056 <span class="keyword">struct </span><a class="code" href="a00020.html">_Caster</a><_ToType*>
<a name="l00057"></a>00057 { <span class="keyword">typedef</span> _ToType* type; };
<a name="l00058"></a>00058 <span class="comment"></span>
<a name="l00059"></a>00059 <span class="comment"> /**</span>
<a name="l00060"></a>00060 <span class="comment"> * Casting operations for cases where _FromType is not a standard pointer.</span>
<a name="l00061"></a>00061 <span class="comment"> * _ToType can be a standard or non-standard pointer. Given that _FromType</span>
<a name="l00062"></a>00062 <span class="comment"> * is not a pointer, it must have a get() method that returns the standard</span>
<a name="l00063"></a>00063 <span class="comment"> * pointer equivalent of the address it points to, and must have an</span>
<a name="l00064"></a>00064 <span class="comment"> * element_type typedef which names the type it points to.</span>
<a name="l00065"></a>00065 <span class="comment"> */</span>
<a name="l00066"></a>00066 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType, <span class="keyword">typename</span> _FromType>
<a name="l00067"></a>00067 <span class="keyword">inline</span> _ToType
<a name="l00068"></a><a class="code" href="a01125.html#a4566aac14311c750b975f5e02e55e471">00068</a> <a class="code" href="a01125.html#a4566aac14311c750b975f5e02e55e471">__static_pointer_cast</a>(<span class="keyword">const</span> _FromType& __arg)
<a name="l00069"></a>00069 { <span class="keywordflow">return</span> _ToType(<span class="keyword">static_cast<</span>typename <a class="code" href="a00020.html">_Caster<_ToType></a>::
<a name="l00070"></a>00070 type<span class="keyword">></span>(__arg.get())); }
<a name="l00071"></a>00071
<a name="l00072"></a>00072 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType, <span class="keyword">typename</span> _FromType>
<a name="l00073"></a>00073 <span class="keyword">inline</span> _ToType
<a name="l00074"></a>00074 __dynamic_pointer_cast(<span class="keyword">const</span> _FromType& __arg)
<a name="l00075"></a>00075 { <span class="keywordflow">return</span> _ToType(<span class="keyword">dynamic_cast<</span>typename _Caster<_ToType>::
<a name="l00076"></a>00076 type<span class="keyword">></span>(__arg.get())); }
<a name="l00077"></a>00077
<a name="l00078"></a>00078 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType, <span class="keyword">typename</span> _FromType>
<a name="l00079"></a>00079 <span class="keyword">inline</span> _ToType
<a name="l00080"></a>00080 __const_pointer_cast(<span class="keyword">const</span> _FromType& __arg)
<a name="l00081"></a>00081 { <span class="keywordflow">return</span> _ToType(<span class="keyword">const_cast<</span>typename _Caster<_ToType>::
<a name="l00082"></a>00082 type<span class="keyword">></span>(__arg.get())); }
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType, <span class="keyword">typename</span> _FromType>
<a name="l00085"></a>00085 <span class="keyword">inline</span> _ToType
<a name="l00086"></a>00086 __reinterpret_pointer_cast(<span class="keyword">const</span> _FromType& __arg)
<a name="l00087"></a>00087 { <span class="keywordflow">return</span> _ToType(<span class="keyword">reinterpret_cast<</span>typename _Caster<_ToType>::
<a name="l00088"></a>00088 type<span class="keyword">></span>(__arg.get())); }
<a name="l00089"></a>00089 <span class="comment"></span>
<a name="l00090"></a>00090 <span class="comment"> /**</span>
<a name="l00091"></a>00091 <span class="comment"> * Casting operations for cases where _FromType is a standard pointer.</span>
<a name="l00092"></a>00092 <span class="comment"> * _ToType can be a standard or non-standard pointer.</span>
<a name="l00093"></a>00093 <span class="comment"> */</span>
<a name="l00094"></a>00094 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType, <span class="keyword">typename</span> _FromType>
<a name="l00095"></a>00095 <span class="keyword">inline</span> _ToType
<a name="l00096"></a><a class="code" href="a01125.html#a7c51de43d1257e6737c38cc499a48652">00096</a> <a class="code" href="a01125.html#a4566aac14311c750b975f5e02e55e471">__static_pointer_cast</a>(_FromType* __arg)
<a name="l00097"></a>00097 { <span class="keywordflow">return</span> _ToType(<span class="keyword">static_cast<</span>typename <a class="code" href="a00020.html">_Caster<_ToType></a>::
<a name="l00098"></a>00098 type<span class="keyword">></span>(__arg)); }
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType, <span class="keyword">typename</span> _FromType>
<a name="l00101"></a>00101 <span class="keyword">inline</span> _ToType
<a name="l00102"></a>00102 __dynamic_pointer_cast(_FromType* __arg)
<a name="l00103"></a>00103 { <span class="keywordflow">return</span> _ToType(<span class="keyword">dynamic_cast<</span>typename _Caster<_ToType>::
<a name="l00104"></a>00104 type<span class="keyword">></span>(__arg)); }
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType, <span class="keyword">typename</span> _FromType>
<a name="l00107"></a>00107 <span class="keyword">inline</span> _ToType
<a name="l00108"></a>00108 __const_pointer_cast(_FromType* __arg)
<a name="l00109"></a>00109 { <span class="keywordflow">return</span> _ToType(<span class="keyword">const_cast<</span>typename _Caster<_ToType>::
<a name="l00110"></a>00110 type<span class="keyword">></span>(__arg)); }
<a name="l00111"></a>00111
<a name="l00112"></a>00112 <span class="keyword">template</span><<span class="keyword">typename</span> _ToType, <span class="keyword">typename</span> _FromType>
<a name="l00113"></a>00113 <span class="keyword">inline</span> _ToType
<a name="l00114"></a>00114 __reinterpret_pointer_cast(_FromType* __arg)
<a name="l00115"></a>00115 { <span class="keywordflow">return</span> _ToType(<span class="keyword">reinterpret_cast<</span>typename _Caster<_ToType>::
<a name="l00116"></a>00116 type<span class="keyword">></span>(__arg)); }
<a name="l00117"></a>00117
<a name="l00118"></a>00118 _GLIBCXX_END_NAMESPACE_VERSION
<a name="l00119"></a>00119 } <span class="comment">// namespace</span>
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="preprocessor">#endif // __GLIBCXX_CAST_H</span>
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