154 lines
4.7 KiB
C++
154 lines
4.7 KiB
C++
// Allocators -*- C++ -*-
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// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
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// Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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/*
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* Copyright (c) 1996-1997
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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/** @file allocator.h
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* This is an internal header file, included by other library headers.
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* You should not attempt to use it directly.
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*/
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#ifndef _ALLOCATOR_H
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#define _ALLOCATOR_H 1
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// Define the base class to std::allocator.
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#include <bits/c++allocator.h>
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#include <bits/cpp_type_traits.h> // for __is_empty
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_GLIBCXX_BEGIN_NAMESPACE(std)
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template<typename _Tp>
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class allocator;
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/// allocator<void> specialization.
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template<>
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class allocator<void>
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{
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public:
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef void* pointer;
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typedef const void* const_pointer;
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typedef void value_type;
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template<typename _Tp1>
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struct rebind
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{ typedef allocator<_Tp1> other; };
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};
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/**
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* @brief The "standard" allocator, as per [20.4].
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*
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* Further details:
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* http://gcc.gnu.org/onlinedocs/libstdc++/20_util/allocator.html
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*/
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template<typename _Tp>
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class allocator: public __glibcxx_base_allocator<_Tp>
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{
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public:
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef _Tp* pointer;
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typedef const _Tp* const_pointer;
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typedef _Tp& reference;
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typedef const _Tp& const_reference;
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typedef _Tp value_type;
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template<typename _Tp1>
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struct rebind
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{ typedef allocator<_Tp1> other; };
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allocator() throw() { }
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allocator(const allocator& __a) throw()
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: __glibcxx_base_allocator<_Tp>(__a) { }
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template<typename _Tp1>
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allocator(const allocator<_Tp1>&) throw() { }
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~allocator() throw() { }
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// Inherit everything else.
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};
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template<typename _T1, typename _T2>
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inline bool
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operator==(const allocator<_T1>&, const allocator<_T2>&)
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{ return true; }
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template<typename _T1, typename _T2>
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inline bool
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operator!=(const allocator<_T1>&, const allocator<_T2>&)
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{ return false; }
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// Inhibit implicit instantiations for required instantiations,
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// which are defined via explicit instantiations elsewhere.
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// NB: This syntax is a GNU extension.
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#if _GLIBCXX_EXTERN_TEMPLATE
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extern template class allocator<char>;
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extern template class allocator<wchar_t>;
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#endif
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// Undefine.
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#undef __glibcxx_base_allocator
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// To implement Option 3 of DR 431.
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template<typename _Alloc, bool = std::__is_empty<_Alloc>::__value>
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struct __alloc_swap
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{ static void _S_do_it(_Alloc&, _Alloc&) { } };
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template<typename _Alloc>
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struct __alloc_swap<_Alloc, false>
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{
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static void
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_S_do_it(_Alloc& __one, _Alloc& __two)
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{
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// Precondition: swappable allocators.
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if (__one != __two)
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swap(__one, __two);
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}
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};
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_GLIBCXX_END_NAMESPACE
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#endif
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