1 // Allocator that wraps operator new -*- C++ -*-
3 // Copyright (C) 2001, 2002, 2003, 2004, 2005, 2009, 2010
4 // Free Software Foundation, Inc.
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)
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.
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.
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/>.
26 /** @file ext/new_allocator.h
27 * This file is a GNU extension to the Standard C++ Library.
30 #ifndef _NEW_ALLOCATOR_H
31 #define _NEW_ALLOCATOR_H 1
33 #include <bits/c++config.h>
35 #include <bits/functexcept.h>
36 #include <bits/move.h>
38 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
40 _GLIBCXX_BEGIN_NAMESPACE_VERSION
46 * @brief An allocator that uses global new, as per [20.4].
49 * This is precisely the allocator defined in the C++ Standard.
50 * - all allocation calls operator new
51 * - all deallocation calls operator delete
53 template<typename _Tp>
57 typedef size_t size_type;
58 typedef ptrdiff_t difference_type;
60 typedef const _Tp* const_pointer;
61 typedef _Tp& reference;
62 typedef const _Tp& const_reference;
63 typedef _Tp value_type;
65 template<typename _Tp1>
67 { typedef new_allocator<_Tp1> other; };
69 new_allocator() _GLIBCXX_USE_NOEXCEPT { }
71 new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { }
73 template<typename _Tp1>
74 new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { }
76 ~new_allocator() _GLIBCXX_USE_NOEXCEPT { }
79 address(reference __x) const _GLIBCXX_NOEXCEPT
80 { return std::__addressof(__x); }
83 address(const_reference __x) const _GLIBCXX_NOEXCEPT
84 { return std::__addressof(__x); }
86 // NB: __n is permitted to be 0. The C++ standard says nothing
87 // about what the return value is when __n == 0.
89 allocate(size_type __n, const void* = 0)
91 if (__n > this->max_size())
92 std::__throw_bad_alloc();
94 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
97 // __p is not permitted to be a null pointer.
99 deallocate(pointer __p, size_type)
100 { ::operator delete(__p); }
103 max_size() const _GLIBCXX_USE_NOEXCEPT
104 { return size_t(-1) / sizeof(_Tp); }
106 #ifdef __GXX_EXPERIMENTAL_CXX0X__
107 template<typename _Up, typename... _Args>
109 construct(_Up* __p, _Args&&... __args)
110 { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
112 template<typename _Up>
114 destroy(_Up* __p) { __p->~_Up(); }
116 // _GLIBCXX_RESOLVE_LIB_DEFECTS
117 // 402. wrong new expression in [some_] allocator::construct
119 construct(pointer __p, const _Tp& __val)
120 { ::new((void *)__p) _Tp(__val); }
123 destroy(pointer __p) { __p->~_Tp(); }
127 template<typename _Tp>
129 operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
132 template<typename _Tp>
134 operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&)
137 _GLIBCXX_END_NAMESPACE_VERSION