libstdc++
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00001 // Allocator that wraps operator new -*- C++ -*- 00002 00003 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010 00004 // Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the 00008 // terms of the GNU General Public License as published by the 00009 // Free Software Foundation; either version 3, or (at your option) 00010 // any later version. 00011 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 00017 // Under Section 7 of GPL version 3, you are granted additional 00018 // permissions described in the GCC Runtime Library Exception, version 00019 // 3.1, as published by the Free Software Foundation. 00020 00021 // You should have received a copy of the GNU General Public License and 00022 // a copy of the GCC Runtime Library Exception along with this program; 00023 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00024 // <http://www.gnu.org/licenses/>. 00025 00026 /** @file ext/new_allocator.h 00027 * This file is a GNU extension to the Standard C++ Library. 00028 */ 00029 00030 #ifndef _NEW_ALLOCATOR_H 00031 #define _NEW_ALLOCATOR_H 1 00032 00033 #include <bits/c++config.h> 00034 #include <new> 00035 #include <bits/functexcept.h> 00036 #include <bits/move.h> 00037 00038 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00039 { 00040 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00041 00042 using std::size_t; 00043 using std::ptrdiff_t; 00044 00045 /** 00046 * @brief An allocator that uses global new, as per [20.4]. 00047 * @ingroup allocators 00048 * 00049 * This is precisely the allocator defined in the C++ Standard. 00050 * - all allocation calls operator new 00051 * - all deallocation calls operator delete 00052 */ 00053 template<typename _Tp> 00054 class new_allocator 00055 { 00056 public: 00057 typedef size_t size_type; 00058 typedef ptrdiff_t difference_type; 00059 typedef _Tp* pointer; 00060 typedef const _Tp* const_pointer; 00061 typedef _Tp& reference; 00062 typedef const _Tp& const_reference; 00063 typedef _Tp value_type; 00064 00065 template<typename _Tp1> 00066 struct rebind 00067 { typedef new_allocator<_Tp1> other; }; 00068 00069 new_allocator() _GLIBCXX_USE_NOEXCEPT { } 00070 00071 new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { } 00072 00073 template<typename _Tp1> 00074 new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { } 00075 00076 ~new_allocator() _GLIBCXX_USE_NOEXCEPT { } 00077 00078 pointer 00079 address(reference __x) const _GLIBCXX_NOEXCEPT 00080 { return std::__addressof(__x); } 00081 00082 const_pointer 00083 address(const_reference __x) const _GLIBCXX_NOEXCEPT 00084 { return std::__addressof(__x); } 00085 00086 // NB: __n is permitted to be 0. The C++ standard says nothing 00087 // about what the return value is when __n == 0. 00088 pointer 00089 allocate(size_type __n, const void* = 0) 00090 { 00091 if (__n > this->max_size()) 00092 std::__throw_bad_alloc(); 00093 00094 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp))); 00095 } 00096 00097 // __p is not permitted to be a null pointer. 00098 void 00099 deallocate(pointer __p, size_type) 00100 { ::operator delete(__p); } 00101 00102 size_type 00103 max_size() const _GLIBCXX_USE_NOEXCEPT 00104 { return size_t(-1) / sizeof(_Tp); } 00105 00106 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 00107 template<typename _Up, typename... _Args> 00108 void 00109 construct(_Up* __p, _Args&&... __args) 00110 { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); } 00111 00112 template<typename _Up> 00113 void 00114 destroy(_Up* __p) { __p->~_Up(); } 00115 #else 00116 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00117 // 402. wrong new expression in [some_] allocator::construct 00118 void 00119 construct(pointer __p, const _Tp& __val) 00120 { ::new((void *)__p) _Tp(__val); } 00121 00122 void 00123 destroy(pointer __p) { __p->~_Tp(); } 00124 #endif 00125 }; 00126 00127 template<typename _Tp> 00128 inline bool 00129 operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&) 00130 { return true; } 00131 00132 template<typename _Tp> 00133 inline bool 00134 operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&) 00135 { return false; } 00136 00137 _GLIBCXX_END_NAMESPACE_VERSION 00138 } // namespace 00139 00140 #endif