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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 00030 #ifndef _MALLOC_ALLOCATOR_H 00031 #define _MALLOC_ALLOCATOR_H 1 00032 00033 #include <new> 00034 00035 namespace __gnu_cxx 00036 { 00046 template<typename _Tp> 00047 class malloc_allocator 00048 { 00049 public: 00050 typedef size_t size_type; 00051 typedef ptrdiff_t difference_type; 00052 typedef _Tp* pointer; 00053 typedef const _Tp* const_pointer; 00054 typedef _Tp& reference; 00055 typedef const _Tp& const_reference; 00056 typedef _Tp value_type; 00057 00058 template<typename _Tp1> 00059 struct rebind 00060 { typedef malloc_allocator<_Tp1> other; }; 00061 00062 malloc_allocator() throw() { } 00063 00064 malloc_allocator(const malloc_allocator&) throw() { } 00065 00066 template<typename _Tp1> 00067 malloc_allocator(const malloc_allocator<_Tp1>&) throw() { } 00068 00069 ~malloc_allocator() throw() { } 00070 00071 pointer 00072 address(reference __x) const { return &__x; } 00073 00074 const_pointer 00075 address(const_reference __x) const { return &__x; } 00076 00077 // NB: __n is permitted to be 0. The C++ standard says nothing 00078 // about what the return value is when __n == 0. 00079 pointer 00080 allocate(size_type __n, const void* = 0) 00081 { 00082 pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp))); 00083 if (!__ret) 00084 throw std::bad_alloc(); 00085 return __ret; 00086 } 00087 00088 // __p is not permitted to be a null pointer. 00089 void 00090 deallocate(pointer __p, size_type) 00091 { free(static_cast<void*>(__p)); } 00092 00093 size_type 00094 max_size() const throw() 00095 { return size_t(-1) / sizeof(_Tp); } 00096 00097 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00098 // 402. wrong new expression in [some_] allocator::construct 00099 void 00100 construct(pointer __p, const _Tp& __val) 00101 { ::new(__p) value_type(__val); } 00102 00103 void 00104 destroy(pointer __p) { __p->~_Tp(); } 00105 }; 00106 00107 template<typename _Tp> 00108 inline bool 00109 operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) 00110 { return true; } 00111 00112 template<typename _Tp> 00113 inline bool 00114 operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) 00115 { return false; } 00116 } // namespace __gnu_cxx 00117 00118 #endif