/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2005-2006 Dan Marsden
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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(BOOST_FUSION_ARRAY_ITERATOR_26122005_2250)
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#define BOOST_FUSION_ARRAY_ITERATOR_26122005_2250
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#include <boost/fusion/support/config.hpp>
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#include <cstddef>
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#include <boost/config.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/minus.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/fusion/iterator/iterator_facade.hpp>
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namespace boost { namespace fusion
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{
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struct random_access_traversal_tag;
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template <typename Array, int Pos>
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struct array_iterator
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: iterator_facade<array_iterator<Array, Pos>, random_access_traversal_tag>
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{
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BOOST_MPL_ASSERT_RELATION(Pos, >=, 0);
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BOOST_MPL_ASSERT_RELATION(Pos, <=, static_cast<int>(Array::static_size));
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typedef mpl::int_<Pos> index;
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typedef Array array_type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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array_iterator(Array& a)
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: array(a) {}
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Array& array;
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template <typename Iterator>
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struct value_of
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{
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typedef typename Iterator::array_type array_type;
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typedef typename array_type::value_type type;
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};
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template <typename Iterator>
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struct deref
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{
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typedef typename Iterator::array_type array_type;
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typedef typename
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mpl::if_<
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is_const<array_type>
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, typename array_type::const_reference
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, typename array_type::reference
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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(Iterator const & it)
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{
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return it.array[Iterator::index::value];
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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 typename Iterator::index index;
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typedef typename Iterator::array_type array_type;
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typedef array_iterator<array_type, index::value + N::value> 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(i.array);
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}
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};
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template <typename Iterator>
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struct next : advance<Iterator, mpl::int_<1> > {};
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template <typename Iterator>
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struct prior : advance<Iterator, mpl::int_<-1> > {};
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template <typename I1, typename I2>
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struct distance : mpl::minus<typename I2::index, typename I1::index>
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{
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typedef typename
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mpl::minus<
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typename I2::index, typename I1::index
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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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BOOST_DELETED_FUNCTION(array_iterator& operator=(array_iterator const&))
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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 Array, int Pos>
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struct iterator_traits< ::boost::fusion::array_iterator<Array, Pos> >
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{ };
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}
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#endif
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#endif
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