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69 lines
2.1 KiB
69 lines
2.1 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_ITERATOR_FACADE_09252006_1011)
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#define FUSION_ITERATOR_FACADE_09252006_1011
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/iterator_base.hpp>
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#include <boost/fusion/iterator/detail/advance.hpp>
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#include <boost/fusion/iterator/detail/distance.hpp>
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#include <boost/fusion/support/category_of.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/if.hpp>
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namespace boost { namespace fusion
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{
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struct iterator_facade_tag;
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template <typename Derived, typename Category>
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struct iterator_facade : iterator_base<Derived>
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{
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typedef iterator_facade_tag fusion_tag;
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typedef Derived derived_type;
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typedef Category category;
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// default implementation
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template <typename I1, typename I2>
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struct equal_to // default implementation
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: is_same<
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typename I1::derived_type
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, typename I2::derived_type
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>
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{};
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// default implementation
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template <typename Iterator, typename N>
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struct advance :
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mpl::if_c<
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(N::value > 0)
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, advance_detail::forward<Iterator, N::value>
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, advance_detail::backward<Iterator, N::value>
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>::type
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{
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BOOST_MPL_ASSERT_NOT((traits::is_random_access<Iterator>));
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};
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// default implementation
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template <typename First, typename Last>
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struct distance :
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distance_detail::linear_distance<First, Last>
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{};
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};
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}}
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#ifdef BOOST_FUSION_WORKAROUND_FOR_LWG_2408
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namespace std
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{
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template <typename Derived, typename Category>
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struct iterator_traits< ::boost::fusion::iterator_facade<Derived, Category> >
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{ };
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}
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#endif
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#endif
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