1 // Allocator that wraps "C" malloc -*- C++ -*-
3 // Copyright (C) 2001, 2002, 2003, 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/malloc_allocator.h
27 * This file is a GNU extension to the Standard C++ Library.
30 #ifndef _MALLOC_ALLOCATOR_H
31 #define _MALLOC_ALLOCATOR_H 1
35 #include <bits/functexcept.h>
36 #include <bits/move.h>
38 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx
)
44 * @brief An allocator that uses malloc.
47 * This is precisely the allocator defined in the C++ Standard.
48 * - all allocation calls malloc
49 * - all deallocation calls free
51 template<typename _Tp
>
52 class malloc_allocator
55 typedef size_t size_type
;
56 typedef ptrdiff_t difference_type
;
58 typedef const _Tp
* const_pointer
;
59 typedef _Tp
& reference
;
60 typedef const _Tp
& const_reference
;
61 typedef _Tp value_type
;
63 template<typename _Tp1
>
65 { typedef malloc_allocator
<_Tp1
> other
; };
67 malloc_allocator() throw() { }
69 malloc_allocator(const malloc_allocator
&) throw() { }
71 template<typename _Tp1
>
72 malloc_allocator(const malloc_allocator
<_Tp1
>&) throw() { }
74 ~malloc_allocator() throw() { }
77 address(reference __x
) const { return std::__addressof(__x
); }
80 address(const_reference __x
) const { return std::__addressof(__x
); }
82 // NB: __n is permitted to be 0. The C++ standard says nothing
83 // about what the return value is when __n == 0.
85 allocate(size_type __n
, const void* = 0)
87 if (__n
> this->max_size())
88 std::__throw_bad_alloc();
90 pointer __ret
= static_cast<_Tp
*>(std::malloc(__n
* sizeof(_Tp
)));
92 std::__throw_bad_alloc();
96 // __p is not permitted to be a null pointer.
98 deallocate(pointer __p
, size_type
)
99 { std::free(static_cast<void*>(__p
)); }
102 max_size() const throw()
103 { return size_t(-1) / sizeof(_Tp
); }
105 // _GLIBCXX_RESOLVE_LIB_DEFECTS
106 // 402. wrong new expression in [some_] allocator::construct
108 construct(pointer __p
, const _Tp
& __val
)
109 { ::new((void *)__p
) value_type(__val
); }
111 #ifdef __GXX_EXPERIMENTAL_CXX0X__
112 template<typename
... _Args
>
114 construct(pointer __p
, _Args
&&... __args
)
115 { ::new((void *)__p
) _Tp(std::forward
<_Args
>(__args
)...); }
119 destroy(pointer __p
) { __p
->~_Tp(); }
122 template<typename _Tp
>
124 operator==(const malloc_allocator
<_Tp
>&, const malloc_allocator
<_Tp
>&)
127 template<typename _Tp
>
129 operator!=(const malloc_allocator
<_Tp
>&, const malloc_allocator
<_Tp
>&)
132 _GLIBCXX_END_NAMESPACE