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47 lines
1.4 KiB
47 lines
1.4 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2007 Tobias Schwinger
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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_ITERATOR_RANGE_AT_IMPL_HPP_INCLUDED)
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#define BOOST_FUSION_ITERATOR_RANGE_AT_IMPL_HPP_INCLUDED
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/iterator/advance.hpp>
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#include <boost/fusion/iterator/deref.hpp>
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namespace boost { namespace fusion
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{
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struct iterator_range_tag;
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namespace extension
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{
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template <typename Tag>
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struct at_impl;
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template <>
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struct at_impl<iterator_range_tag>
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{
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template <typename Seq, typename N>
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struct apply
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{
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typedef typename Seq::begin_type begin_type;
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typedef typename result_of::advance<begin_type,N>::type pos;
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typedef typename result_of::deref<pos>::type type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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static type
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call(Seq& s)
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{
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return * fusion::advance<N>(s.first);
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}
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};
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};
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}
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}}
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#endif
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