1 // Allocator that wraps operator new -*- C++ -*- 2 3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /** @file ext/new_allocator.h 27 * This file is a GNU extension to the Standard C++ Library. 28 */ 29 30 #ifndef _NEW_ALLOCATOR_H 31 #define _NEW_ALLOCATOR_H 1 32 33 #include <bits/c++config.h> 34 #include <new> 35 #include <bits/functexcept.h> 36 #include <bits/move.h> 37 38 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 39 { 40 _GLIBCXX_BEGIN_NAMESPACE_VERSION 41 42 using std::size_t; 43 using std::ptrdiff_t; 44 45 /** 46 * @brief An allocator that uses global new, as per [20.4]. 47 * @ingroup allocators 48 * 49 * This is precisely the allocator defined in the C++ Standard. 50 * - all allocation calls operator new 51 * - all deallocation calls operator delete 52 */ 53 template<typename _Tp> 54 class new_allocator 55 { 56 public: 57 typedef size_t size_type; 58 typedef ptrdiff_t difference_type; 59 typedef _Tp* pointer; 60 typedef const _Tp* const_pointer; 61 typedef _Tp& reference; 62 typedef const _Tp& const_reference; 63 typedef _Tp value_type; 64 65 template<typename _Tp1> 66 struct rebind 67 { typedef new_allocator<_Tp1> other; }; 68 69 new_allocator() _GLIBCXX_USE_NOEXCEPT { } 70 71 new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { } 72 73 template<typename _Tp1> 74 new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { } 75 76 ~new_allocator() _GLIBCXX_USE_NOEXCEPT { } 77 78 pointer 79 address(reference __x) const _GLIBCXX_NOEXCEPT 80 { return std::__addressof(__x); } 81 82 const_pointer 83 address(const_reference __x) const _GLIBCXX_NOEXCEPT 84 { return std::__addressof(__x); } 85 86 // NB: __n is permitted to be 0. The C++ standard says nothing 87 // about what the return value is when __n == 0. 88 pointer 89 allocate(size_type __n, const void* = 0) 90 { 91 if (__n > this->max_size()) 92 std::__throw_bad_alloc(); 93 94 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp))); 95 } 96 97 // __p is not permitted to be a null pointer. 98 void 99 deallocate(pointer __p, size_type) 100 { ::operator delete(__p); } 101 102 size_type 103 max_size() const _GLIBCXX_USE_NOEXCEPT 104 { return size_t(-1) / sizeof(_Tp); } 105 106 #ifdef __GXX_EXPERIMENTAL_CXX0X__ 107 template<typename _Up, typename... _Args> 108 void 109 construct(_Up* __p, _Args&&... __args) 110 { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); } 111 112 template<typename _Up> 113 void 114 destroy(_Up* __p) { __p->~_Up(); } 115 #else 116 // _GLIBCXX_RESOLVE_LIB_DEFECTS 117 // 402. wrong new expression in [some_] allocator::construct 118 void 119 construct(pointer __p, const _Tp& __val) 120 { ::new((void *)__p) _Tp(__val); } 121 122 void 123 destroy(pointer __p) { __p->~_Tp(); } 124 #endif 125 }; 126 127 template<typename _Tp> 128 inline bool 129 operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&) 130 { return true; } 131 132 template<typename _Tp> 133 inline bool 134 operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&) 135 { return false; } 136 137 _GLIBCXX_END_NAMESPACE_VERSION 138 } // namespace 139 140 #endif 141
