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41 lines
1.2 KiB
41 lines
1.2 KiB
/*=============================================================================
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Copyright (c) 2011 Eric Niebler
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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_SINGLE_VIEW_VALUE_AT_IMPL_JUL_07_2011_1348PM)
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#define BOOST_FUSION_SINGLE_VIEW_VALUE_AT_IMPL_JUL_07_2011_1348PM
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#include <boost/fusion/support/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/equal_to.hpp>
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#include <boost/fusion/sequence/intrinsic/value_at.hpp>
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namespace boost { namespace fusion
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{
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struct single_view_tag;
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namespace extension
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{
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template<typename Tag>
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struct value_at_impl;
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template<>
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struct value_at_impl<single_view_tag>
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{
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template<typename Sequence, typename N>
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struct apply
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{
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BOOST_MPL_ASSERT((mpl::equal_to<N, mpl::int_<0> >));
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typedef typename Sequence::value_type type;
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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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