1 // Allocator that wraps operator new -*- C++ -*-
3 // Copyright (C) 2001, 2002, 2003, 2004 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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 #ifndef _NEW_ALLOCATOR_H
31 #define _NEW_ALLOCATOR_H 1
34 #include <bits/functexcept.h>
39 * @brief An allocator that uses global new, as per [20.4].
41 * This is precisely the allocator defined in the C++ Standard.
42 * - all allocation calls operator new
43 * - all deallocation calls operator delete
45 template<typename _Tp
>
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
;
57 template<typename _Tp1
>
59 { typedef new_allocator
<_Tp1
> other
; };
61 new_allocator() throw() { }
63 new_allocator(const new_allocator
&) throw() { }
65 template<typename _Tp1
>
66 new_allocator(const new_allocator
<_Tp1
>&) throw() { }
68 ~new_allocator() throw() { }
71 address(reference __x
) const { return &__x
; }
74 address(const_reference __x
) const { return &__x
; }
76 // NB: __n is permitted to be 0. The C++ standard says nothing
77 // about what the return value is when __n == 0.
79 allocate(size_type __n
, const void* = 0)
81 if (__builtin_expect(__n
> this->max_size(), false))
82 std::__throw_bad_alloc();
84 return static_cast<_Tp
*>(::operator new(__n
* sizeof(_Tp
)));
87 // __p is not permitted to be a null pointer.
89 deallocate(pointer __p
, size_type
)
90 { ::operator delete(__p
); }
93 max_size() const throw()
94 { return size_t(-1) / sizeof(_Tp
); }
96 // _GLIBCXX_RESOLVE_LIB_DEFECTS
97 // 402. wrong new expression in [some_] allocator::construct
99 construct(pointer __p
, const _Tp
& __val
)
100 { ::new(__p
) _Tp(__val
); }
103 destroy(pointer __p
) { __p
->~_Tp(); }
106 template<typename _Tp
>
108 operator==(const new_allocator
<_Tp
>&, const new_allocator
<_Tp
>&)
111 template<typename _Tp
>
113 operator!=(const new_allocator
<_Tp
>&, const new_allocator
<_Tp
>&)
115 } // namespace __gnu_cxx