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46 lines
1.4 KiB
C++
46 lines
1.4 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_FRONT_09162005_0343)
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#define FUSION_FRONT_09162005_0343
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/sequence/intrinsic_fwd.hpp>
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
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#include <boost/fusion/iterator/deref.hpp>
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#include <boost/mpl/bool.hpp>
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namespace boost { namespace fusion
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{
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struct fusion_sequence_tag;
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namespace result_of
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{
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template <typename Sequence>
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struct front
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: result_of::deref<typename result_of::begin<Sequence>::type>
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{};
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}
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template <typename Sequence>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::front<Sequence>::type
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front(Sequence& seq)
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{
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return *fusion::begin(seq);
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}
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template <typename Sequence>
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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inline typename result_of::front<Sequence const>::type
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front(Sequence const& seq)
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{
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return *fusion::begin(seq);
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}
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}}
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#endif
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