1 // array allocator -*- C++ -*-
3 // Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 2, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
30 /** @file ext/array_allocator.h
31 * This file is a GNU extension to the Standard C++ Library.
34 #ifndef _ARRAY_ALLOCATOR_H
35 #define _ARRAY_ALLOCATOR_H 1
39 #include <bits/functexcept.h>
41 #include <bits/stl_move.h>
43 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
49 template<typename _Tp>
50 class array_allocator_base
53 typedef size_t size_type;
54 typedef ptrdiff_t difference_type;
56 typedef const _Tp* const_pointer;
57 typedef _Tp& reference;
58 typedef const _Tp& const_reference;
59 typedef _Tp value_type;
62 address(reference __x) const { return &__x; }
65 address(const_reference __x) const { return &__x; }
68 deallocate(pointer, size_type)
74 max_size() const throw()
75 { return size_t(-1) / sizeof(_Tp); }
77 // _GLIBCXX_RESOLVE_LIB_DEFECTS
78 // 402. wrong new expression in [some_] allocator::construct
80 construct(pointer __p, const _Tp& __val)
81 { ::new((void *)__p) value_type(__val); }
83 #ifdef __GXX_EXPERIMENTAL_CXX0X__
84 template<typename... _Args>
86 construct(pointer __p, _Args&&... __args)
87 { ::new((void *)__p) _Tp(std::forward<_Args>(__args)...); }
91 destroy(pointer __p) { __p->~_Tp(); }
95 * @brief An allocator that uses previously allocated memory.
96 * This memory can be externally, globally, or otherwise allocated.
98 template<typename _Tp, typename _Array = std::tr1::array<_Tp, 1> >
99 class array_allocator : public array_allocator_base<_Tp>
102 typedef size_t size_type;
103 typedef ptrdiff_t difference_type;
104 typedef _Tp* pointer;
105 typedef const _Tp* const_pointer;
106 typedef _Tp& reference;
107 typedef const _Tp& const_reference;
108 typedef _Tp value_type;
109 typedef _Array array_type;
112 array_type* _M_array;
116 template<typename _Tp1, typename _Array1 = _Array>
118 { typedef array_allocator<_Tp1, _Array1> other; };
120 array_allocator(array_type* __array = NULL) throw()
121 : _M_array(__array), _M_used(size_type()) { }
123 array_allocator(const array_allocator& __o) throw()
124 : _M_array(__o._M_array), _M_used(__o._M_used) { }
126 template<typename _Tp1, typename _Array1>
127 array_allocator(const array_allocator<_Tp1, _Array1>&) throw()
128 : _M_array(NULL), _M_used(size_type()) { }
130 ~array_allocator() throw() { }
133 allocate(size_type __n, const void* = 0)
135 if (_M_array == 0 || _M_used + __n > _M_array->size())
136 std::__throw_bad_alloc();
137 pointer __ret = _M_array->begin() + _M_used;
143 template<typename _Tp, typename _Array>
145 operator==(const array_allocator<_Tp, _Array>&,
146 const array_allocator<_Tp, _Array>&)
149 template<typename _Tp, typename _Array>
151 operator!=(const array_allocator<_Tp, _Array>&,
152 const array_allocator<_Tp, _Array>&)
155 _GLIBCXX_END_NAMESPACE