00001 // Allocator that wraps operator new -*- 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 _NEW_ALLOCATOR_H 00035 #define _NEW_ALLOCATOR_H 1 00036 00037 #include <new> 00038 #include <bits/functexcept.h> 00039 00040 namespace __gnu_cxx 00041 { 00049 template<typename _Tp> 00050 class new_allocator 00051 { 00052 public: 00053 typedef size_t size_type; 00054 typedef ptrdiff_t difference_type; 00055 typedef _Tp* pointer; 00056 typedef const _Tp* const_pointer; 00057 typedef _Tp& reference; 00058 typedef const _Tp& const_reference; 00059 typedef _Tp value_type; 00060 00061 template<typename _Tp1> 00062 struct rebind 00063 { typedef new_allocator<_Tp1> other; }; 00064 00065 new_allocator() throw() { } 00066 00067 new_allocator(const new_allocator&) throw() { } 00068 00069 template<typename _Tp1> 00070 new_allocator(const new_allocator<_Tp1>&) throw() { } 00071 00072 ~new_allocator() throw() { } 00073 00074 pointer 00075 address(reference __x) const { return &__x; } 00076 00077 const_pointer 00078 address(const_reference __x) const { return &__x; } 00079 00080 // NB: __n is permitted to be 0. The C++ standard says nothing 00081 // about what the return value is when __n == 0. 00082 pointer 00083 allocate(size_type __n, const void* = 0) 00084 { 00085 if (__builtin_expect(__n > this->max_size(), false)) 00086 std::__throw_bad_alloc(); 00087 00088 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp))); 00089 } 00090 00091 // __p is not permitted to be a null pointer. 00092 void 00093 deallocate(pointer __p, size_type) 00094 { ::operator delete(__p); } 00095 00096 size_type 00097 max_size() const throw() 00098 { return size_t(-1) / sizeof(_Tp); } 00099 00100 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00101 // 402. wrong new expression in [some_] allocator::construct 00102 void 00103 construct(pointer __p, const _Tp& __val) 00104 { ::new(__p) _Tp(__val); } 00105 00106 void 00107 destroy(pointer __p) { __p->~_Tp(); } 00108 }; 00109 00110 template<typename _Tp> 00111 inline bool 00112 operator==(const new_allocator<_Tp>&, const new_allocator<_Tp>&) 00113 { return true; } 00114 00115 template<typename _Tp> 00116 inline bool 00117 operator!=(const new_allocator<_Tp>&, const new_allocator<_Tp>&) 00118 { return false; } 00119 } // namespace __gnu_cxx 00120 00121 #endif