1 // Allocators -*- C++ -*-
3 // Copyright (C) 2001, 2002, 2003 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.
31 * Copyright (c) 1996-1997
32 * Silicon Graphics Computer Systems, Inc.
34 * Permission to use, copy, modify, distribute and sell this software
35 * and its documentation for any purpose is hereby granted without fee,
36 * provided that the above copyright notice appear in all copies and
37 * that both that copyright notice and this permission notice appear
38 * in supporting documentation. Silicon Graphics makes no
39 * representations about the suitability of this software for any
40 * purpose. It is provided "as is" without express or implied warranty.
43 /** @file ext/debug_allocator.h
44 * This file is a GNU extension to the Standard C++ Library.
45 * You should only include this header if you are using GCC 3 or later.
48 #ifndef _DEBUG_ALLOCATOR_H
49 #define _DEBUG_ALLOCATOR_H 1
56 * @brief A meta-allocator with debugging bits, as per [20.4].
58 * This is precisely the allocator defined in the C++ Standard.
59 * - all allocation calls operator new
60 * - all deallocation calls operator delete
62 * (See @link Allocators allocators info @endlink for more.)
64 template<typename _Alloc
>
68 typedef typename
_Alloc::size_type size_type
;
69 typedef typename
_Alloc::difference_type difference_type
;
70 typedef typename
_Alloc::pointer pointer
;
71 typedef typename
_Alloc::const_pointer const_pointer
;
72 typedef typename
_Alloc::reference reference
;
73 typedef typename
_Alloc::const_reference const_reference
;
74 typedef typename
_Alloc::value_type value_type
;
77 // Size of space used to store size. Note that this must be
78 // large enough to preserve alignment.
79 const size_t _M_extra
;
84 debug_allocator() : _M_extra(8) { }
87 allocate(size_type __n
, std::allocator
<void>::const_pointer
= 0)
89 pointer __result
= _M_allocator
.allocate(__n
+ _M_extra
);
91 return __result
+ _M_extra
;
95 deallocate(pointer __p
, size_type __n
)
97 pointer __real_p
= __p
- _M_extra
;
100 _M_allocator
.deallocate(__real_p
, __n
+ _M_extra
);
103 } // namespace __gnu_cxx