// Pointer casting classes -*- C++ -*-

// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
// 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// 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.

//////////////////////////////////////////////////////////////////////////////
//
// This version of cast_to<> is based on an original version used
// in Boost.interprocess, and is
// (C) Copyright Ion Gaztañaga 2005-2007. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////

#ifndef PTR_TRAITS_
#define PTR_TRAITS_

_GLIBCXX_BEGIN_NAMESPACE(std)

// Provides a class for casting between pointer types.
// T must be a pointer type.
// examples:
//
//  const T* cp;
//  T* p = cast_to<T*>::using_const_cast(cp);
//
//	relative_ptr<const T> cp;
//  relative_ptr<T> p = cast_to< relative_ptr<const T> >::using const_cast(cp);

template<class T>
class cast_to
{
public:
   template<class S>
   static T 
   using_static_cast(S s)
   	{ return static_cast<T>(s); }

   template<class S>
   static T
   using_reinterpret_cast(S s)
   	{ return reinterpret_cast<T>(s); }

   template<class S>
   static T
   using_const_cast(S s)
   	{ return const_cast<T>(s); }

   template<class S>
   static T
   using_dynamic_cast(S s)
   	{ return dynamic_cast<T>(s); }
};

_GLIBCXX_END_NAMESPACE

#endif /*PTR_TRAITS_*/