| 1 | // Boost.Range library |
|---|---|
| 2 | // |
| 3 | // Copyright Thorsten Ottosen 2003-2004. Use, modification and |
| 4 | // distribution is subject to the Boost Software License, Version |
| 5 | // 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
| 6 | // http://www.boost.org/LICENSE_1_0.txt) |
| 7 | // |
| 8 | // For more information, see http://www.boost.org/libs/range/ |
| 9 | // |
| 10 | |
| 11 | #ifndef BOOST_RANGE_DIFFERENCE_TYPE_HPP |
| 12 | #define BOOST_RANGE_DIFFERENCE_TYPE_HPP |
| 13 | |
| 14 | #if defined(_MSC_VER) |
| 15 | # pragma once |
| 16 | #endif |
| 17 | |
| 18 | #include <boost/mpl/and.hpp> |
| 19 | #include <boost/range/config.hpp> |
| 20 | #include <boost/range/iterator.hpp> |
| 21 | #include <boost/range/has_range_iterator.hpp> |
| 22 | #include <boost/iterator/iterator_traits.hpp> |
| 23 | #include <boost/type_traits/remove_reference.hpp> |
| 24 | |
| 25 | namespace boost |
| 26 | { |
| 27 | namespace range_detail |
| 28 | { |
| 29 | template< class T, bool B = has_type<range_iterator<T> >::value > |
| 30 | struct range_difference |
| 31 | { }; |
| 32 | |
| 33 | template< class T > |
| 34 | struct range_difference<T, true> |
| 35 | : iterator_difference< |
| 36 | BOOST_DEDUCED_TYPENAME range_iterator<T>::type |
| 37 | > |
| 38 | { }; |
| 39 | } |
| 40 | |
| 41 | template< class T > |
| 42 | struct range_difference |
| 43 | : range_detail::range_difference<BOOST_DEDUCED_TYPENAME remove_reference<T>::type> |
| 44 | { }; |
| 45 | } |
| 46 | |
| 47 | #endif |
| 48 |