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1 // array allocator -*- C++ -*-
3 // Copyright (C) 2004, 2005, 2006, 2007, 2008, 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/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 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx
)
45 template<typename _Tp
>
46 class array_allocator_base
49 typedef size_t size_type
;
50 typedef ptrdiff_t difference_type
;
52 typedef const _Tp
* const_pointer
;
53 typedef _Tp
& reference
;
54 typedef const _Tp
& const_reference
;
55 typedef _Tp value_type
;
58 address(reference __x
) const { return std::__addressof(__x
); }
61 address(const_reference __x
) const { return std::__addressof(__x
); }
64 deallocate(pointer
, size_type
)
70 max_size() const throw()
71 { return size_t(-1) / sizeof(_Tp
); }
73 // _GLIBCXX_RESOLVE_LIB_DEFECTS
74 // 402. wrong new expression in [some_] allocator::construct
76 construct(pointer __p
, const _Tp
& __val
)
77 { ::new((void *)__p
) value_type(__val
); }
79 #ifdef __GXX_EXPERIMENTAL_CXX0X__
80 template<typename
... _Args
>
82 construct(pointer __p
, _Args
&&... __args
)
83 { ::new((void *)__p
) _Tp(std::forward
<_Args
>(__args
)...); }
87 destroy(pointer __p
) { __p
->~_Tp(); }
91 * @brief An allocator that uses previously allocated memory.
92 * This memory can be externally, globally, or otherwise allocated.
95 template<typename _Tp
, typename _Array
= std::tr1::array
<_Tp
, 1> >
96 class array_allocator
: public array_allocator_base
<_Tp
>
99 typedef size_t size_type
;
100 typedef ptrdiff_t difference_type
;
101 typedef _Tp
* pointer
;
102 typedef const _Tp
* const_pointer
;
103 typedef _Tp
& reference
;
104 typedef const _Tp
& const_reference
;
105 typedef _Tp value_type
;
106 typedef _Array array_type
;
109 array_type
* _M_array
;
113 template<typename _Tp1
, typename _Array1
= _Array
>
115 { typedef array_allocator
<_Tp1
, _Array1
> other
; };
117 array_allocator(array_type
* __array
= 0) throw()
118 : _M_array(__array
), _M_used(size_type()) { }
120 array_allocator(const array_allocator
& __o
) throw()
121 : _M_array(__o
._M_array
), _M_used(__o
._M_used
) { }
123 template<typename _Tp1
, typename _Array1
>
124 array_allocator(const array_allocator
<_Tp1
, _Array1
>&) throw()
125 : _M_array(0), _M_used(size_type()) { }
127 ~array_allocator() throw() { }
130 allocate(size_type __n
, const void* = 0)
132 if (_M_array
== 0 || _M_used
+ __n
> _M_array
->size())
133 std::__throw_bad_alloc();
134 pointer __ret
= _M_array
->begin() + _M_used
;
140 template<typename _Tp
, typename _Array
>
142 operator==(const array_allocator
<_Tp
, _Array
>&,
143 const array_allocator
<_Tp
, _Array
>&)
146 template<typename _Tp
, typename _Array
>
148 operator!=(const array_allocator
<_Tp
, _Array
>&,
149 const array_allocator
<_Tp
, _Array
>&)
152 _GLIBCXX_END_NAMESPACE