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Diffstat (limited to 'boost/fusion/adapted/boost_tuple/detail/at_impl.hpp')
| -rw-r--r-- | boost/fusion/adapted/boost_tuple/detail/at_impl.hpp | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/boost/fusion/adapted/boost_tuple/detail/at_impl.hpp b/boost/fusion/adapted/boost_tuple/detail/at_impl.hpp new file mode 100644 index 0000000000..8e2312500b --- /dev/null +++ b/boost/fusion/adapted/boost_tuple/detail/at_impl.hpp @@ -0,0 +1,50 @@ +/*============================================================================= + Copyright (c) 2001-2011 Joel de Guzman + + Distributed under the Boost Software License, Version 1.0. (See accompanying + file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) +==============================================================================*/ +#if !defined(BOOST_FUSION_AT_IMPL_09262006_1920) +#define BOOST_FUSION_AT_IMPL_09262006_1920 + +#include <boost/tuple/tuple.hpp> +#include <boost/mpl/if.hpp> + +namespace boost { namespace fusion +{ + struct boost_tuple_tag; + + namespace extension + { + template<typename T> + struct at_impl; + + template <> + struct at_impl<boost_tuple_tag> + { + template <typename Sequence, typename N> + struct apply + { + typedef typename + tuples::element<N::value, Sequence>::type + element; + + typedef typename + mpl::if_< + is_const<Sequence> + , typename tuples::access_traits<element>::const_type + , typename tuples::access_traits<element>::non_const_type + >::type + type; + + static type + call(Sequence& seq) + { + return tuples::get<N::value>(seq); + } + }; + }; + } +}} + +#endif |