| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2001-2011 Joel de Guzman |
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| 3 | |
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| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 6 | ==============================================================================*/ |
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| 7 | #if !defined(FUSION_ITERATOR_FACADE_09252006_1011) |
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| 8 | #define FUSION_ITERATOR_FACADE_09252006_1011 |
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| 9 | |
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| 10 | #include <boost/fusion/support/config.hpp> |
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| 11 | #include <boost/fusion/support/iterator_base.hpp> |
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| 12 | #include <boost/fusion/iterator/detail/advance.hpp> |
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| 13 | #include <boost/fusion/iterator/detail/distance.hpp> |
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| 14 | #include <boost/fusion/support/category_of.hpp> |
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| 15 | #include <boost/type_traits/is_same.hpp> |
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| 16 | #include <boost/mpl/assert.hpp> |
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| 17 | #include <boost/mpl/if.hpp> |
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| 18 | |
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| 19 | namespace boost { namespace fusion |
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| 20 | { |
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| 21 | struct iterator_facade_tag; |
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| 22 | |
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| 23 | template <typename Derived, typename Category> |
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| 24 | struct iterator_facade : iterator_base<Derived> |
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| 25 | { |
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| 26 | typedef iterator_facade_tag fusion_tag; |
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| 27 | typedef Derived derived_type; |
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| 28 | typedef Category category; |
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| 29 | |
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| 30 | // default implementation |
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| 31 | template <typename I1, typename I2> |
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| 32 | struct equal_to // default implementation |
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| 33 | : is_same< |
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| 34 | typename I1::derived_type |
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| 35 | , typename I2::derived_type |
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| 36 | > |
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| 37 | {}; |
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| 38 | |
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| 39 | // default implementation |
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| 40 | template <typename Iterator, typename N> |
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| 41 | struct advance : |
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| 42 | mpl::if_c< |
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| 43 | (N::value > 0) |
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| 44 | , advance_detail::forward<Iterator, N::value> |
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| 45 | , advance_detail::backward<Iterator, N::value> |
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| 46 | >::type |
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| 47 | { |
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| 48 | BOOST_MPL_ASSERT_NOT((traits::is_random_access<Iterator>)); |
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| 49 | }; |
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| 50 | |
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| 51 | // default implementation |
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| 52 | template <typename First, typename Last> |
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| 53 | struct distance : |
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| 54 | distance_detail::linear_distance<First, Last> |
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| 55 | {}; |
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| 56 | }; |
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| 57 | }} |
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| 58 | |
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| 59 | #ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408 |
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| 60 | namespace std |
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| 61 | { |
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| 62 | template <typename Derived, typename Category> |
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| 63 | struct iterator_traits< ::boost::fusion::iterator_facade<Derived, Category> > |
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| 64 | { }; |
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| 65 | } |
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| 66 | #endif |
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| 67 | |
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| 68 | #endif |
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| 69 | |
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