1132720Skan// Allocator that wraps "C" malloc -*- C++ -*- 2132720Skan 3169691Skan// Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. 4132720Skan// 5132720Skan// This file is part of the GNU ISO C++ Library. This library is free 6132720Skan// software; you can redistribute it and/or modify it under the 7132720Skan// terms of the GNU General Public License as published by the 8132720Skan// Free Software Foundation; either version 2, or (at your option) 9132720Skan// any later version. 10132720Skan 11132720Skan// This library is distributed in the hope that it will be useful, 12132720Skan// but WITHOUT ANY WARRANTY; without even the implied warranty of 13132720Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14132720Skan// GNU General Public License for more details. 15132720Skan 16132720Skan// You should have received a copy of the GNU General Public License along 17132720Skan// with this library; see the file COPYING. If not, write to the Free 18169691Skan// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19132720Skan// USA. 20132720Skan 21132720Skan// As a special exception, you may use this file as part of a free software 22132720Skan// library without restriction. Specifically, if other files instantiate 23132720Skan// templates or use macros or inline functions from this file, or you compile 24132720Skan// this file and link it with other files to produce an executable, this 25132720Skan// file does not by itself cause the resulting executable to be covered by 26132720Skan// the GNU General Public License. This exception does not however 27132720Skan// invalidate any other reasons why the executable file might be covered by 28132720Skan// the GNU General Public License. 29132720Skan 30169691Skan/** @file ext/malloc_allocator.h 31169691Skan * This file is a GNU extension to the Standard C++ Library. 32169691Skan */ 33169691Skan 34132720Skan#ifndef _MALLOC_ALLOCATOR_H 35132720Skan#define _MALLOC_ALLOCATOR_H 1 36132720Skan 37169691Skan#include <cstdlib> 38132720Skan#include <new> 39169691Skan#include <bits/functexcept.h> 40132720Skan 41169691Skan_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 42169691Skan 43169691Skan using std::size_t; 44169691Skan using std::ptrdiff_t; 45169691Skan 46132720Skan /** 47169691Skan * @brief An allocator that uses malloc. 48132720Skan * 49132720Skan * This is precisely the allocator defined in the C++ Standard. 50132720Skan * - all allocation calls malloc 51132720Skan * - all deallocation calls free 52132720Skan */ 53132720Skan template<typename _Tp> 54132720Skan class malloc_allocator 55132720Skan { 56132720Skan public: 57132720Skan typedef size_t size_type; 58132720Skan typedef ptrdiff_t difference_type; 59132720Skan typedef _Tp* pointer; 60132720Skan typedef const _Tp* const_pointer; 61132720Skan typedef _Tp& reference; 62132720Skan typedef const _Tp& const_reference; 63132720Skan typedef _Tp value_type; 64132720Skan 65132720Skan template<typename _Tp1> 66132720Skan struct rebind 67132720Skan { typedef malloc_allocator<_Tp1> other; }; 68132720Skan 69132720Skan malloc_allocator() throw() { } 70132720Skan 71132720Skan malloc_allocator(const malloc_allocator&) throw() { } 72132720Skan 73132720Skan template<typename _Tp1> 74132720Skan malloc_allocator(const malloc_allocator<_Tp1>&) throw() { } 75132720Skan 76132720Skan ~malloc_allocator() throw() { } 77132720Skan 78132720Skan pointer 79132720Skan address(reference __x) const { return &__x; } 80132720Skan 81132720Skan const_pointer 82132720Skan address(const_reference __x) const { return &__x; } 83132720Skan 84132720Skan // NB: __n is permitted to be 0. The C++ standard says nothing 85132720Skan // about what the return value is when __n == 0. 86132720Skan pointer 87132720Skan allocate(size_type __n, const void* = 0) 88132720Skan { 89169691Skan if (__builtin_expect(__n > this->max_size(), false)) 90169691Skan std::__throw_bad_alloc(); 91169691Skan 92132720Skan pointer __ret = static_cast<_Tp*>(malloc(__n * sizeof(_Tp))); 93132720Skan if (!__ret) 94169691Skan std::__throw_bad_alloc(); 95132720Skan return __ret; 96132720Skan } 97132720Skan 98132720Skan // __p is not permitted to be a null pointer. 99132720Skan void 100132720Skan deallocate(pointer __p, size_type) 101132720Skan { free(static_cast<void*>(__p)); } 102132720Skan 103132720Skan size_type 104132720Skan max_size() const throw() 105132720Skan { return size_t(-1) / sizeof(_Tp); } 106132720Skan 107132720Skan // _GLIBCXX_RESOLVE_LIB_DEFECTS 108132720Skan // 402. wrong new expression in [some_] allocator::construct 109132720Skan void 110132720Skan construct(pointer __p, const _Tp& __val) 111132720Skan { ::new(__p) value_type(__val); } 112132720Skan 113132720Skan void 114132720Skan destroy(pointer __p) { __p->~_Tp(); } 115132720Skan }; 116132720Skan 117132720Skan template<typename _Tp> 118132720Skan inline bool 119132720Skan operator==(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) 120132720Skan { return true; } 121132720Skan 122132720Skan template<typename _Tp> 123132720Skan inline bool 124132720Skan operator!=(const malloc_allocator<_Tp>&, const malloc_allocator<_Tp>&) 125132720Skan { return false; } 126132720Skan 127169691Skan_GLIBCXX_END_NAMESPACE 128169691Skan 129132720Skan#endif 130