allocator.h

来自「symbian上STL模板库的实现」· C头文件 代码 · 共 131 行

// Allocators -*- C++ -*-

// Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

/*
 * Copyright (c) 1996-1997
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 */

/** @file allocator.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _ALLOCATOR_H
#define _ALLOCATOR_H 1

// Define the base class to std::allocator.
#include <bits/c++allocator.h>

namespace std
{
    template<typename _Tp>
        class allocator;

    template<>
        class allocator<void>
        {
            public:
                typedef size_t      size_type;
                typedef ptrdiff_t   difference_type;
                typedef void*       pointer;
                typedef const void* const_pointer;
                typedef void        value_type;

                template<typename _Tp1>
                    struct rebind
                    { typedef allocator<_Tp1> other; };
        };

    /**
     *  @brief  The "standard" allocator, as per [20.4].
     *
     *  (See @link Allocators allocators info @endlink for more.)
     */
    template<typename _Tp>
        class allocator: public ___glibcxx_base_allocator<_Tp>
    {
        public:
            typedef size_t     size_type;
            typedef ptrdiff_t  difference_type;
            typedef _Tp*       pointer;
            typedef const _Tp* const_pointer;
            typedef _Tp&       reference;
            typedef const _Tp& const_reference;
            typedef _Tp        value_type;

            template<typename _Tp1>
                struct rebind
                { typedef allocator<_Tp1> other; };

            allocator() throw() { }

            allocator(const allocator& a) throw()
                : ___glibcxx_base_allocator<_Tp>(a) { }

            template<typename _Tp1>
                allocator(const allocator<_Tp1>&) throw() { }

            ~allocator() throw() { }

            // Inherit everything else.
    };

    template<typename _T1, typename _T2>
        inline bool
        operator==(const allocator<_T1>&, const allocator<_T2>&)
        { return true; }

    template<typename _T1, typename _T2>
        inline bool
        operator!=(const allocator<_T1>&, const allocator<_T2>&)
        { return false; }

    // Inhibit implicit instantiations for required instantiations,
    // which are defined via explicit instantiations elsewhere.
    // NB: This syntax is a GNU extension.
#if _GLIBCXX_EXTERN_TEMPLATE
    extern template class allocator<char>;
    extern template class allocator<wchar_t>;
#endif

    // Undefine.
#undef ___glibcxx_base_allocator
} // namespace std

#endif