forked from boostorg/fusion
6ab68a29d8
Now available for GCC(libstdc++v3) < 4.5 and MSVC 12.0. It means, there is no ambiguous about calling next/prior/... via ADL.
129 lines
3.5 KiB
C++
129 lines
3.5 KiB
C++
/*=============================================================================
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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_MPL_ITERATOR_05052005_0731)
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#define FUSION_MPL_ITERATOR_05052005_0731
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/detail/mpl_iterator_category.hpp>
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#include <boost/fusion/iterator/iterator_facade.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/mpl/deref.hpp>
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#include <boost/mpl/next.hpp>
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#include <boost/mpl/prior.hpp>
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#include <boost/mpl/advance.hpp>
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#include <boost/mpl/distance.hpp>
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namespace boost { namespace fusion
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{
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template <typename Iterator_>
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struct mpl_iterator
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: iterator_facade<
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mpl_iterator<Iterator_>
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, typename detail::mpl_iterator_category<typename Iterator_::category>::type
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>
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{
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typedef typename remove_const<Iterator_>::type iterator_type;
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template <typename Iterator>
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struct value_of : mpl::deref<typename Iterator::iterator_type> {};
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template <typename Iterator>
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struct deref
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{
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typedef typename mpl::deref<
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typename Iterator::iterator_type>::type
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator)
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{
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return type();
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}
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};
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template <typename Iterator>
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struct next
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{
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typedef mpl_iterator<
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typename mpl::next<typename Iterator::iterator_type>::type>
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator)
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{
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return type();
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}
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};
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template <typename Iterator>
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struct prior
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{
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typedef mpl_iterator<
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typename mpl::prior<typename Iterator::iterator_type>::type>
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator)
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{
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return type();
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}
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};
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template <typename Iterator, typename N>
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struct advance
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{
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typedef mpl_iterator<
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typename mpl::advance<typename Iterator::iterator_type, N>::type>
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Iterator const& /*i*/)
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{
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return type();
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}
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};
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template <typename I1, typename I2>
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struct distance :
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mpl::distance<
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typename I1::iterator_type
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, typename I2::iterator_type>
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{
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typedef typename
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mpl::distance<
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typename I1::iterator_type
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, typename I2::iterator_type
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>::type
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type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(I1 const&, I2 const&)
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{
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return type();
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}
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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 Iterator>
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struct iterator_traits< ::boost::fusion::mpl_iterator<Iterator> >
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{ };
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}
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#endif
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#endif
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