1 // Allocator that wraps operator new -*- C++ -*-
3 // Copyright (C) 2001, 2002, 2003, 2004, 2005 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/new_allocator.h
31 * This file is a GNU extension to the Standard C++ Library.
34 #ifndef _NEW_ALLOCATOR_H
35 #define _NEW_ALLOCATOR_H 1
38 #include <bits/functexcept.h>
40 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx
)
46 * @brief An allocator that uses global new, as per [20.4].
48 * This is precisely the allocator defined in the C++ Standard.
49 * - all allocation calls operator new
50 * - all deallocation calls operator delete
52 template<typename _Tp
>
56 typedef size_t size_type
;
57 typedef ptrdiff_t difference_type
;
59 typedef const _Tp
* const_pointer
;
60 typedef _Tp
& reference
;
61 typedef const _Tp
& const_reference
;
62 typedef _Tp value_type
;
64 template<typename _Tp1
>
66 { typedef new_allocator
<_Tp1
> other
; };
68 new_allocator() throw() { }
70 new_allocator(const new_allocator
&) throw() { }
72 template<typename _Tp1
>
73 new_allocator(const new_allocator
<_Tp1
>&) throw() { }
75 ~new_allocator() throw() { }
78 address(reference __x
) const { return &__x
; }
81 address(const_reference __x
) const { return &__x
; }
83 // NB: __n is permitted to be 0. The C++ standard says nothing
84 // about what the return value is when __n == 0.
86 allocate(size_type __n
, const void* = 0)
88 if (__builtin_expect(__n
> this->max_size(), false))
89 std::__throw_bad_alloc();
91 return static_cast<_Tp
*>(::operator new(__n
* sizeof(_Tp
)));
94 // __p is not permitted to be a null pointer.
96 deallocate(pointer __p
, size_type
)
97 { ::operator delete(__p
); }
100 max_size() const throw()
101 { return size_t(-1) / sizeof(_Tp
); }
103 // _GLIBCXX_RESOLVE_LIB_DEFECTS
104 // 402. wrong new expression in [some_] allocator::construct
106 construct(pointer __p
, const _Tp
& __val
)
107 { ::new(__p
) _Tp(__val
); }
110 destroy(pointer __p
) { __p
->~_Tp(); }
113 template<typename _Tp
>
115 operator==(const new_allocator
<_Tp
>&, const new_allocator
<_Tp
>&)
118 template<typename _Tp
>
120 operator!=(const new_allocator
<_Tp
>&, const new_allocator
<_Tp
>&)
123 _GLIBCXX_END_NAMESPACE