1 // array allocator -*- C++ -*-
3 // Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
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/array_allocator.h
27 * This file is a GNU extension to the Standard C++ Library.
30 #ifndef _ARRAY_ALLOCATOR_H
31 #define _ARRAY_ALLOCATOR_H 1
33 #include <bits/c++config.h>
35 #include <bits/functexcept.h>
37 #include <bits/move.h>
39 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
41 _GLIBCXX_BEGIN_NAMESPACE_VERSION
47 template<typename _Tp>
48 class array_allocator_base
51 typedef size_t size_type;
52 typedef ptrdiff_t difference_type;
54 typedef const _Tp* const_pointer;
55 typedef _Tp& reference;
56 typedef const _Tp& const_reference;
57 typedef _Tp value_type;
60 address(reference __x) const _GLIBCXX_NOEXCEPT
61 { return std::__addressof(__x); }
64 address(const_reference __x) const _GLIBCXX_NOEXCEPT
65 { return std::__addressof(__x); }
68 deallocate(pointer, size_type)
74 max_size() const _GLIBCXX_USE_NOEXCEPT
75 { return size_t(-1) / sizeof(_Tp); }
77 #ifdef __GXX_EXPERIMENTAL_CXX0X__
78 template<typename _Up, typename... _Args>
80 construct(_Up* __p, _Args&&... __args)
81 { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
83 template<typename _Up>
85 destroy(_Up* __p) { __p->~_Up(); }
87 // _GLIBCXX_RESOLVE_LIB_DEFECTS
88 // 402. wrong new expression in [some_] allocator::construct
90 construct(pointer __p, const _Tp& __val)
91 { ::new((void *)__p) value_type(__val); }
94 destroy(pointer __p) { __p->~_Tp(); }
99 * @brief An allocator that uses previously allocated memory.
100 * This memory can be externally, globally, or otherwise allocated.
101 * @ingroup allocators
103 template<typename _Tp, typename _Array = std::tr1::array<_Tp, 1> >
104 class array_allocator : public array_allocator_base<_Tp>
107 typedef size_t size_type;
108 typedef ptrdiff_t difference_type;
109 typedef _Tp* pointer;
110 typedef const _Tp* const_pointer;
111 typedef _Tp& reference;
112 typedef const _Tp& const_reference;
113 typedef _Tp value_type;
114 typedef _Array array_type;
117 array_type* _M_array;
121 template<typename _Tp1, typename _Array1 = _Array>
123 { typedef array_allocator<_Tp1, _Array1> other; };
125 array_allocator(array_type* __array = 0) _GLIBCXX_USE_NOEXCEPT
126 : _M_array(__array), _M_used(size_type()) { }
128 array_allocator(const array_allocator& __o) _GLIBCXX_USE_NOEXCEPT
129 : _M_array(__o._M_array), _M_used(__o._M_used) { }
131 template<typename _Tp1, typename _Array1>
132 array_allocator(const array_allocator<_Tp1, _Array1>&)
133 _GLIBCXX_USE_NOEXCEPT
134 : _M_array(0), _M_used(size_type()) { }
136 ~array_allocator() _GLIBCXX_USE_NOEXCEPT { }
139 allocate(size_type __n, const void* = 0)
141 if (_M_array == 0 || _M_used + __n > _M_array->size())
142 std::__throw_bad_alloc();
143 pointer __ret = _M_array->begin() + _M_used;
149 template<typename _Tp, typename _Array>
151 operator==(const array_allocator<_Tp, _Array>&,
152 const array_allocator<_Tp, _Array>&)
155 template<typename _Tp, typename _Array>
157 operator!=(const array_allocator<_Tp, _Array>&,
158 const array_allocator<_Tp, _Array>&)
161 _GLIBCXX_END_NAMESPACE_VERSION