| 1 | /*============================================================================= |
|---|---|
| 2 | Copyright (c) 2011 Eric Niebler |
| 3 | |
| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| 6 | ==============================================================================*/ |
| 7 | |
| 8 | #if !defined(BOOST_FUSION_SINGLE_VIEW_ITERATOR_JUL_07_2011_1348PM) |
| 9 | #define BOOST_FUSION_SINGLE_VIEW_ITERATOR_JUL_07_2011_1348PM |
| 10 | |
| 11 | #include <boost/fusion/support/config.hpp> |
| 12 | #include <boost/mpl/assert.hpp> |
| 13 | #include <boost/mpl/equal_to.hpp> |
| 14 | #include <boost/type_traits/is_same.hpp> |
| 15 | #include <boost/type_traits/add_const.hpp> |
| 16 | |
| 17 | namespace boost { namespace fusion |
| 18 | { |
| 19 | struct single_view_iterator_tag; |
| 20 | |
| 21 | namespace extension |
| 22 | { |
| 23 | template<typename Tag> |
| 24 | struct equal_to_impl; |
| 25 | |
| 26 | template<> |
| 27 | struct equal_to_impl<single_view_iterator_tag> |
| 28 | { |
| 29 | template<typename It1, typename It2> |
| 30 | struct apply |
| 31 | : mpl::equal_to<typename It1::position, typename It2::position> |
| 32 | { |
| 33 | BOOST_MPL_ASSERT((is_same<typename add_const<typename It1::single_view_type>::type, |
| 34 | typename add_const<typename It2::single_view_type>::type>)); |
| 35 | }; |
| 36 | }; |
| 37 | } |
| 38 | }} |
| 39 | |
| 40 | #endif |
| 41 |