1169691Skan// array allocator -*- C++ -*- 2169691Skan 3169691Skan// Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc. 4169691Skan// 5169691Skan// This file is part of the GNU ISO C++ Library. This library is free 6169691Skan// software; you can redistribute it and/or modify it under the 7169691Skan// terms of the GNU General Public License as published by the 8169691Skan// Free Software Foundation; either version 2, or (at your option) 9169691Skan// any later version. 10169691Skan 11169691Skan// This library is distributed in the hope that it will be useful, 12169691Skan// but WITHOUT ANY WARRANTY; without even the implied warranty of 13169691Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14169691Skan// GNU General Public License for more details. 15169691Skan 16169691Skan// You should have received a copy of the GNU General Public License along 17169691Skan// 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, 19169691Skan// USA. 20169691Skan 21169691Skan// As a special exception, you may use this file as part of a free software 22169691Skan// library without restriction. Specifically, if other files instantiate 23169691Skan// templates or use macros or inline functions from this file, or you compile 24169691Skan// this file and link it with other files to produce an executable, this 25169691Skan// file does not by itself cause the resulting executable to be covered by 26169691Skan// the GNU General Public License. This exception does not however 27169691Skan// invalidate any other reasons why the executable file might be covered by 28169691Skan// the GNU General Public License. 29169691Skan 30169691Skan/** @file ext/array_allocator.h 31169691Skan * This file is a GNU extension to the Standard C++ Library. 32169691Skan */ 33169691Skan 34169691Skan#ifndef _ARRAY_ALLOCATOR_H 35169691Skan#define _ARRAY_ALLOCATOR_H 1 36169691Skan 37169691Skan#include <cstddef> 38169691Skan#include <new> 39169691Skan#include <bits/functexcept.h> 40169691Skan#include <tr1/array> 41169691Skan 42169691Skan_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 43169691Skan 44169691Skan using std::size_t; 45169691Skan using std::ptrdiff_t; 46169691Skan 47169691Skan /// @brief Base class. 48169691Skan template<typename _Tp> 49169691Skan class array_allocator_base 50169691Skan { 51169691Skan public: 52169691Skan typedef size_t size_type; 53169691Skan typedef ptrdiff_t difference_type; 54169691Skan typedef _Tp* pointer; 55169691Skan typedef const _Tp* const_pointer; 56169691Skan typedef _Tp& reference; 57169691Skan typedef const _Tp& const_reference; 58169691Skan typedef _Tp value_type; 59169691Skan 60169691Skan pointer 61169691Skan address(reference __x) const { return &__x; } 62169691Skan 63169691Skan const_pointer 64169691Skan address(const_reference __x) const { return &__x; } 65169691Skan 66169691Skan void 67169691Skan deallocate(pointer, size_type) 68169691Skan { 69169691Skan // Does nothing. 70169691Skan } 71169691Skan 72169691Skan size_type 73169691Skan max_size() const throw() 74169691Skan { return size_t(-1) / sizeof(_Tp); } 75169691Skan 76169691Skan // _GLIBCXX_RESOLVE_LIB_DEFECTS 77169691Skan // 402. wrong new expression in [some_] allocator::construct 78169691Skan void 79169691Skan construct(pointer __p, const _Tp& __val) 80169691Skan { ::new(__p) value_type(__val); } 81169691Skan 82169691Skan void 83169691Skan destroy(pointer __p) { __p->~_Tp(); } 84169691Skan }; 85169691Skan 86169691Skan /** 87169691Skan * @brief An allocator that uses previously allocated memory. 88169691Skan * This memory can be externally, globally, or otherwise allocated. 89169691Skan */ 90169691Skan template<typename _Tp, typename _Array = std::tr1::array<_Tp, 1> > 91169691Skan class array_allocator : public array_allocator_base<_Tp> 92169691Skan { 93169691Skan public: 94169691Skan typedef size_t size_type; 95169691Skan typedef ptrdiff_t difference_type; 96169691Skan typedef _Tp* pointer; 97169691Skan typedef const _Tp* const_pointer; 98169691Skan typedef _Tp& reference; 99169691Skan typedef const _Tp& const_reference; 100169691Skan typedef _Tp value_type; 101169691Skan typedef _Array array_type; 102169691Skan 103169691Skan private: 104169691Skan array_type* _M_array; 105169691Skan size_type _M_used; 106169691Skan 107169691Skan public: 108169691Skan template<typename _Tp1, typename _Array1 = _Array> 109169691Skan struct rebind 110169691Skan { typedef array_allocator<_Tp1, _Array1> other; }; 111169691Skan 112169691Skan array_allocator(array_type* __array = NULL) throw() 113169691Skan : _M_array(__array), _M_used(size_type()) { } 114169691Skan 115169691Skan array_allocator(const array_allocator& __o) throw() 116169691Skan : _M_array(__o._M_array), _M_used(__o._M_used) { } 117169691Skan 118169691Skan template<typename _Tp1, typename _Array1> 119169691Skan array_allocator(const array_allocator<_Tp1, _Array1>&) throw() 120169691Skan : _M_array(NULL), _M_used(size_type()) { } 121169691Skan 122169691Skan ~array_allocator() throw() { } 123169691Skan 124169691Skan pointer 125169691Skan allocate(size_type __n, const void* = 0) 126169691Skan { 127169691Skan if (_M_array == 0 || _M_used + __n > _M_array->size()) 128169691Skan std::__throw_bad_alloc(); 129169691Skan pointer __ret = _M_array->begin() + _M_used; 130169691Skan _M_used += __n; 131169691Skan return __ret; 132169691Skan } 133169691Skan }; 134169691Skan 135169691Skan template<typename _Tp, typename _Array> 136169691Skan inline bool 137169691Skan operator==(const array_allocator<_Tp, _Array>&, 138169691Skan const array_allocator<_Tp, _Array>&) 139169691Skan { return true; } 140169691Skan 141169691Skan template<typename _Tp, typename _Array> 142169691Skan inline bool 143169691Skan operator!=(const array_allocator<_Tp, _Array>&, 144169691Skan const array_allocator<_Tp, _Array>&) 145169691Skan { return false; } 146169691Skan 147169691Skan_GLIBCXX_END_NAMESPACE 148169691Skan 149169691Skan#endif 150