1 // Allocator that wraps "C" malloc -*- C++ -*- 2 3 // Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc. 4 // 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) 9 // any later version. 10 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. 15 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, 19 // USA. 20 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. 29 30 #ifndef _MALLOC_ALLOCATOR_H 31 #define _MALLOC_ALLOCATOR_H 1 32 33 #include <new> 34 35 namespace __gnu_cxx 36 { 37 /** 38 * @brief An allocator that uses malloc 39 * 40 * This is precisely the allocator defined in the C++ Standard. 41 * - all allocation calls malloc 42 * - all deallocation calls free 43 * 44 * (See @link Allocators allocators info @endlink for more.) 45 */ 46 template<typename _Tp> 47 class malloc_allocator 48 { 49 public: 50 typedef size_t size_type; 51 typedef ptrdiff_t difference_type; 52 typedef _Tp* pointer; 53 typedef const _Tp* const_pointer; 54 typedef _Tp& reference; 55 typedef const _Tp& const_reference; 56 typedef _Tp value_type; 57 58 template<typename _Tp1> 59 struct rebind 60 { typedef malloc_allocator<_Tp1> other; }; 61 throw()62 malloc_allocator() throw() { } 63 throw()64 malloc_allocator(const malloc_allocator&) throw() { } 65 66 template<typename _Tp1> malloc_allocator(const malloc_allocator<_Tp1> &)67 malloc_allocator(const malloc_allocator<_Tp1>&) throw() { } 68 throw()69 ~malloc_allocator() throw() { } 70 71 pointer address(reference __x)72 address(reference __x) const { return &__x; } 73 74 const_pointer address(const_reference __x)75 address(const_reference __x) const { return &__x; } 76 77 // NB: __n is permitted to be 0. The C++ standard says nothing 78 // about what the return value is when __n == 0. 79 pointer 80 allocate(size_type __n, const void* = 0) 81 { 82 pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp))); 83 if (!__ret) 84 throw std::bad_alloc(); 85 return __ret; 86 } 87 88 // __p is not permitted to be a null pointer. 89 void deallocate(pointer __p,size_type)90 deallocate(pointer __p, size_type) 91 { free(static_cast<void*>(__p)); } 92 93 size_type max_size()94 max_size() const throw() 95 { return size_t(-1) / sizeof(_Tp); } 96 97 // _GLIBCXX_RESOLVE_LIB_DEFECTS 98 // 402. wrong new expression in [some_] allocator::construct 99 void construct(pointer __p,const _Tp & __val)100 construct(pointer __p, const _Tp& __val) 101 { ::new(__p) value_type(__val); } 102 103 void destroy(pointer __p)104 destroy(pointer __p) { __p->~_Tp(); } 105 }; 106 107 template<typename _Tp> 108 inline bool 109 operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) 110 { return true; } 111 112 template<typename _Tp> 113 inline bool 114 operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) 115 { return false; } 116 } // namespace __gnu_cxx 117 118 #endif 119