libstdc++
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00001 // nonstandard construct and destroy functions -*- C++ -*- 00002 00003 // Copyright (C) 2001-2015 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /* 00026 * 00027 * Copyright (c) 1994 00028 * Hewlett-Packard Company 00029 * 00030 * Permission to use, copy, modify, distribute and sell this software 00031 * and its documentation for any purpose is hereby granted without fee, 00032 * provided that the above copyright notice appear in all copies and 00033 * that both that copyright notice and this permission notice appear 00034 * in supporting documentation. Hewlett-Packard Company makes no 00035 * representations about the suitability of this software for any 00036 * purpose. It is provided "as is" without express or implied warranty. 00037 * 00038 * 00039 * Copyright (c) 1996,1997 00040 * Silicon Graphics Computer Systems, Inc. 00041 * 00042 * Permission to use, copy, modify, distribute and sell this software 00043 * and its documentation for any purpose is hereby granted without fee, 00044 * provided that the above copyright notice appear in all copies and 00045 * that both that copyright notice and this permission notice appear 00046 * in supporting documentation. Silicon Graphics makes no 00047 * representations about the suitability of this software for any 00048 * purpose. It is provided "as is" without express or implied warranty. 00049 */ 00050 00051 /** @file bits/stl_construct.h 00052 * This is an internal header file, included by other library headers. 00053 * Do not attempt to use it directly. @headername{memory} 00054 */ 00055 00056 #ifndef _STL_CONSTRUCT_H 00057 #define _STL_CONSTRUCT_H 1 00058 00059 #include <new> 00060 #include <bits/move.h> 00061 #include <ext/alloc_traits.h> 00062 00063 namespace std _GLIBCXX_VISIBILITY(default) 00064 { 00065 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00066 00067 /** 00068 * Constructs an object in existing memory by invoking an allocated 00069 * object's constructor with an initializer. 00070 */ 00071 #if __cplusplus >= 201103L 00072 template<typename _T1, typename... _Args> 00073 inline void 00074 _Construct(_T1* __p, _Args&&... __args) 00075 { ::new(static_cast<void*>(__p)) _T1(std::forward<_Args>(__args)...); } 00076 #else 00077 template<typename _T1, typename _T2> 00078 inline void 00079 _Construct(_T1* __p, const _T2& __value) 00080 { 00081 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00082 // 402. wrong new expression in [some_]allocator::construct 00083 ::new(static_cast<void*>(__p)) _T1(__value); 00084 } 00085 #endif 00086 00087 /** 00088 * Destroy the object pointed to by a pointer type. 00089 */ 00090 template<typename _Tp> 00091 inline void 00092 _Destroy(_Tp* __pointer) 00093 { __pointer->~_Tp(); } 00094 00095 template<bool> 00096 struct _Destroy_aux 00097 { 00098 template<typename _ForwardIterator> 00099 static void 00100 __destroy(_ForwardIterator __first, _ForwardIterator __last) 00101 { 00102 for (; __first != __last; ++__first) 00103 std::_Destroy(std::__addressof(*__first)); 00104 } 00105 }; 00106 00107 template<> 00108 struct _Destroy_aux<true> 00109 { 00110 template<typename _ForwardIterator> 00111 static void 00112 __destroy(_ForwardIterator, _ForwardIterator) { } 00113 }; 00114 00115 /** 00116 * Destroy a range of objects. If the value_type of the object has 00117 * a trivial destructor, the compiler should optimize all of this 00118 * away, otherwise the objects' destructors must be invoked. 00119 */ 00120 template<typename _ForwardIterator> 00121 inline void 00122 _Destroy(_ForwardIterator __first, _ForwardIterator __last) 00123 { 00124 typedef typename iterator_traits<_ForwardIterator>::value_type 00125 _Value_type; 00126 std::_Destroy_aux<__has_trivial_destructor(_Value_type)>:: 00127 __destroy(__first, __last); 00128 } 00129 00130 /** 00131 * Destroy a range of objects using the supplied allocator. For 00132 * nondefault allocators we do not optimize away invocation of 00133 * destroy() even if _Tp has a trivial destructor. 00134 */ 00135 00136 template<typename _ForwardIterator, typename _Allocator> 00137 void 00138 _Destroy(_ForwardIterator __first, _ForwardIterator __last, 00139 _Allocator& __alloc) 00140 { 00141 typedef __gnu_cxx::__alloc_traits<_Allocator> __traits; 00142 for (; __first != __last; ++__first) 00143 __traits::destroy(__alloc, std::__addressof(*__first)); 00144 } 00145 00146 template<typename _ForwardIterator, typename _Tp> 00147 inline void 00148 _Destroy(_ForwardIterator __first, _ForwardIterator __last, 00149 allocator<_Tp>&) 00150 { 00151 _Destroy(__first, __last); 00152 } 00153 00154 _GLIBCXX_END_NAMESPACE_VERSION 00155 } // namespace std 00156 00157 #endif /* _STL_CONSTRUCT_H */ 00158