00001 // Allocator that wraps "C" malloc -*- C++ -*- 00002 00003 // Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 2, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // You should have received a copy of the GNU General Public License along 00017 // with this library; see the file COPYING. If not, write to the Free 00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 00019 // USA. 00020 00021 // As a special exception, you may use this file as part of a free software 00022 // library without restriction. Specifically, if other files instantiate 00023 // templates or use macros or inline functions from this file, or you compile 00024 // this file and link it with other files to produce an executable, this 00025 // file does not by itself cause the resulting executable to be covered by 00026 // the GNU General Public License. This exception does not however 00027 // invalidate any other reasons why the executable file might be covered by 00028 // the GNU General Public License. 00029 00034 #ifndef _MALLOC_ALLOCATOR_H 00035 #define _MALLOC_ALLOCATOR_H 1 00036 00037 #include <cstdlib> 00038 #include <new> 00039 #include <bits/functexcept.h> 00040 00041 namespace __gnu_cxx 00042 { 00050 template<typename _Tp> 00051 class malloc_allocator 00052 { 00053 public: 00054 typedef size_t size_type; 00055 typedef ptrdiff_t difference_type; 00056 typedef _Tp* pointer; 00057 typedef const _Tp* const_pointer; 00058 typedef _Tp& reference; 00059 typedef const _Tp& const_reference; 00060 typedef _Tp value_type; 00061 00062 template<typename _Tp1> 00063 struct rebind 00064 { typedef malloc_allocator<_Tp1> other; }; 00065 00066 malloc_allocator() throw() { } 00067 00068 malloc_allocator(const malloc_allocator&) throw() { } 00069 00070 template<typename _Tp1> 00071 malloc_allocator(const malloc_allocator<_Tp1>&) throw() { } 00072 00073 ~malloc_allocator() throw() { } 00074 00075 pointer 00076 address(reference __x) const { return &__x; } 00077 00078 const_pointer 00079 address(const_reference __x) const { return &__x; } 00080 00081 // NB: __n is permitted to be 0. The C++ standard says nothing 00082 // about what the return value is when __n == 0. 00083 pointer 00084 allocate(size_type __n, const void* = 0) 00085 { 00086 if (__builtin_expect(__n > this->max_size(), false)) 00087 std::__throw_bad_alloc(); 00088 00089 pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp))); 00090 if (!__ret) 00091 std::__throw_bad_alloc(); 00092 return __ret; 00093 } 00094 00095 // __p is not permitted to be a null pointer. 00096 void 00097 deallocate(pointer __p, size_type) 00098 { free(static_cast<void*>(__p)); } 00099 00100 size_type 00101 max_size() const throw() 00102 { return size_t(-1) / sizeof(_Tp); } 00103 00104 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00105 // 402. wrong new expression in [some_] allocator::construct 00106 void 00107 construct(pointer __p, const _Tp& __val) 00108 { ::new(__p) value_type(__val); } 00109 00110 void 00111 destroy(pointer __p) { __p->~_Tp(); } 00112 }; 00113 00114 template<typename _Tp> 00115 inline bool 00116 operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) 00117 { return true; } 00118 00119 template<typename _Tp> 00120 inline bool 00121 operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) 00122 { return false; } 00123 } // namespace __gnu_cxx 00124 00125 #endif