53 lines
1.6 KiB
Plaintext
53 lines
1.6 KiB
Plaintext
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/*=============================================================================
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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(BOOST_FUSION_AT_IMPL_09262006_1920)
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#define BOOST_FUSION_AT_IMPL_09262006_1920
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#include <boost/fusion/support/config.hpp>
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#include <boost/tuple/tuple.hpp>
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#include <boost/mpl/if.hpp>
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namespace boost { namespace fusion
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{
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struct boost_tuple_tag;
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namespace extension
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{
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template<typename T>
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struct at_impl;
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template <>
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struct at_impl<boost_tuple_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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typedef typename
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tuples::element<N::value, Sequence>::type
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element;
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typedef typename
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mpl::if_<
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is_const<Sequence>
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, typename tuples::access_traits<element>::const_type
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, typename tuples::access_traits<element>::non_const_type
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>::type
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type;
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BOOST_FUSION_GPU_ENABLED
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static type
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call(Sequence& seq)
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{
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return tuples::get<N::value>(seq);
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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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