1 // array allocator -*- C++ -*-
3 // Copyright (C) 2004, 2005, 2006 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>
42 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
47 /// @brief Base class.
48 template<typename _Tp>
49 class array_allocator_base
52 typedef size_t size_type;
53 typedef ptrdiff_t difference_type;
55 typedef const _Tp* const_pointer;
56 typedef _Tp& reference;
57 typedef const _Tp& const_reference;
58 typedef _Tp value_type;
61 address(reference __x) const { return &__x; }
64 address(const_reference __x) const { return &__x; }
67 deallocate(pointer, size_type)
73 max_size() const throw()
74 { return size_t(-1) / sizeof(_Tp); }
76 // _GLIBCXX_RESOLVE_LIB_DEFECTS
77 // 402. wrong new expression in [some_] allocator::construct
79 construct(pointer __p, const _Tp& __val)
80 { ::new(__p) value_type(__val); }
83 destroy(pointer __p) { __p->~_Tp(); }
87 * @brief An allocator that uses previously allocated memory.
88 * This memory can be externally, globally, or otherwise allocated.
90 template<typename _Tp, typename _Array = std::tr1::array<_Tp, 1> >
91 class array_allocator : public array_allocator_base<_Tp>
94 typedef size_t size_type;
95 typedef ptrdiff_t difference_type;
97 typedef const _Tp* const_pointer;
98 typedef _Tp& reference;
99 typedef const _Tp& const_reference;
100 typedef _Tp value_type;
101 typedef _Array array_type;
104 array_type* _M_array;
108 template<typename _Tp1, typename _Array1 = _Array>
110 { typedef array_allocator<_Tp1, _Array1> other; };
112 array_allocator(array_type* __array = NULL) throw()
113 : _M_array(__array), _M_used(size_type()) { }
115 array_allocator(const array_allocator& __o) throw()
116 : _M_array(__o._M_array), _M_used(__o._M_used) { }
118 template<typename _Tp1, typename _Array1>
119 array_allocator(const array_allocator<_Tp1, _Array1>&) throw()
120 : _M_array(NULL), _M_used(size_type()) { }
122 ~array_allocator() throw() { }
125 allocate(size_type __n, const void* = 0)
127 if (_M_array == 0 || _M_used + __n > _M_array->size())
128 std::__throw_bad_alloc();
129 pointer __ret = _M_array->begin() + _M_used;
135 template<typename _Tp, typename _Array>
137 operator==(const array_allocator<_Tp, _Array>&,
138 const array_allocator<_Tp, _Array>&)
141 template<typename _Tp, typename _Array>
143 operator!=(const array_allocator<_Tp, _Array>&,
144 const array_allocator<_Tp, _Array>&)
147 _GLIBCXX_END_NAMESPACE