// Boost.Range library

//

//  Copyright Thorsten Ottosen 2003-2004. Use, modification and

//  distribution is subject to 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)

//

// For more information, see http://www.boost.org/libs/range/

//

#ifndef BOOST_RANGE_DIFFERENCE_TYPE_HPP

#define BOOST_RANGE_DIFFERENCE_TYPE_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)

# pragma once

#endif

#include <boost/range/config.hpp>

#include <boost/range/const_iterator.hpp>

#include <boost/iterator/iterator_traits.hpp>

namespace boost

{

        template< class T >

        struct range_difference

        {

                typedef BOOST_DEDUCED_TYPENAME iterator_difference<

                        BOOST_DEDUCED_TYPENAME range_const_iterator<T>::type >::type

                                type;

        };

}

//#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

//#include <boost/range/detail/difference_type.hpp>

//#else

/*

#include <cstddef>

#include <utility>

namespace boost

{

    //////////////////////////////////////////////////////////////////////////

    // default

    //////////////////////////////////////////////////////////////////////////

    template< typename C >

    struct range_difference

    {

        typedef BOOST_DEDUCED_TYPENAME C::difference_type type;

    };

    //////////////////////////////////////////////////////////////////////////

    // pair

    //////////////////////////////////////////////////////////////////////////

    template< typename Iterator >

    struct range_difference< std::pair<Iterator,Iterator> >

    {

        typedef BOOST_DEDUCED_TYPENAME

            iterator_difference<Iterator>::type type;

    };

    template< typename Iterator >

    struct range_difference< const std::pair<Iterator,Iterator> >

    {

        typedef BOOST_DEDUCED_TYPENAME

            iterator_difference<Iterator>::type type;

    };

    //////////////////////////////////////////////////////////////////////////

    // array

    //////////////////////////////////////////////////////////////////////////

    template< typename T, std::size_t sz >

    struct range_difference< T[sz] >

    {

        typedef std::ptrdiff_t type;

    };

    template< typename T, std::size_t sz >

    struct range_difference< const T[sz] >

    {

        typedef std::ptrdiff_t type;

    };

    //////////////////////////////////////////////////////////////////////////

    // string

    //////////////////////////////////////////////////////////////////////////

    template<>

    struct range_difference< char* >

    {

        typedef std::ptrdiff_t type;

    };

    template<>

    struct range_difference< wchar_t* >

    {

        typedef std::ptrdiff_t type;

    };

    template<>

    struct range_difference< const char* >

    {

        typedef std::ptrdiff_t type;

    };

    template<>

    struct range_difference< const wchar_t* >

    {

        typedef std::ptrdiff_t type;

    };

    template<>

    struct range_difference< char* const >

    {

        typedef std::ptrdiff_t type;

    };

    template<>

    struct range_difference< wchar_t* const >

    {

        typedef std::ptrdiff_t type;

    };

    template<>

    struct range_difference< const char* const >

    {

        typedef std::ptrdiff_t type;

    };

    template<>

    struct range_difference< const wchar_t* const >

    {

        typedef std::ptrdiff_t type;

    };

} // namespace boost

#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

*/

#endif