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- // 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)
- # pragma once
- #endif
- #include <boost/mpl/and.hpp>
- #include <boost/range/config.hpp>
- #include <boost/range/iterator.hpp>
- #include <boost/range/has_range_iterator.hpp>
- #include <boost/iterator/iterator_traits.hpp>
- #include <boost/type_traits/remove_reference.hpp>
- namespace boost
- {
- namespace range_detail
- {
- template< class T, bool B = has_type<range_iterator<T> >::value >
- struct range_difference
- { };
- template< class T >
- struct range_difference<T, true>
- : iterator_difference<
- BOOST_DEDUCED_TYPENAME range_iterator<T>::type
- >
- { };
- }
- template< class T >
- struct range_difference
- : range_detail::range_difference<BOOST_DEDUCED_TYPENAME remove_reference<T>::type>
- { };
- }
- #endif
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