1 // Allocator that wraps "C" malloc -*- 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/malloc_allocator.h
31 * This file is a GNU extension to the Standard C++ Library.
34 #ifndef _MALLOC_ALLOCATOR_H
35 #define _MALLOC_ALLOCATOR_H 1
39 #include <bits/functexcept.h>
41 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
47 * @brief An allocator that uses malloc.
49 * This is precisely the allocator defined in the C++ Standard.
50 * - all allocation calls malloc
51 * - all deallocation calls free
53 template<typename _Tp>
54 class malloc_allocator
57 typedef size_t size_type;
58 typedef ptrdiff_t difference_type;
60 typedef const _Tp* const_pointer;
61 typedef _Tp& reference;
62 typedef const _Tp& const_reference;
63 typedef _Tp value_type;
65 template<typename _Tp1>
67 { typedef malloc_allocator<_Tp1> other; };
69 malloc_allocator() throw() { }
71 malloc_allocator(const malloc_allocator&) throw() { }
73 template<typename _Tp1>
74 malloc_allocator(const malloc_allocator<_Tp1>&) throw() { }
76 ~malloc_allocator() throw() { }
79 address(reference __x) const { return &__x; }
82 address(const_reference __x) const { return &__x; }
84 // NB: __n is permitted to be 0. The C++ standard says nothing
85 // about what the return value is when __n == 0.
87 allocate(size_type __n, const void* = 0)
89 if (__builtin_expect(__n > this->max_size(), false))
90 std::__throw_bad_alloc();
92 pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp)));
94 std::__throw_bad_alloc();
98 // __p is not permitted to be a null pointer.
100 deallocate(pointer __p, size_type)
101 { free(static_cast<void*>(__p)); }
104 max_size() const throw()
105 { return size_t(-1) / sizeof(_Tp); }
107 // _GLIBCXX_RESOLVE_LIB_DEFECTS
108 // 402. wrong new expression in [some_] allocator::construct
110 construct(pointer __p, const _Tp& __val)
111 { ::new(__p) value_type(__val); }
114 destroy(pointer __p) { __p->~_Tp(); }
117 template<typename _Tp>
119 operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&)
122 template<typename _Tp>
124 operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&)
127 _GLIBCXX_END_NAMESPACE