boost/range/difference_type.hpp
// 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