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Diffstat (limited to 'boost/fusion/adapted/std_tuple/detail/at_impl.hpp')
| -rw-r--r-- | boost/fusion/adapted/std_tuple/detail/at_impl.hpp | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/boost/fusion/adapted/std_tuple/detail/at_impl.hpp b/boost/fusion/adapted/std_tuple/detail/at_impl.hpp new file mode 100644 index 0000000000..2f09719ca7 --- /dev/null +++ b/boost/fusion/adapted/std_tuple/detail/at_impl.hpp @@ -0,0 +1,52 @@ +/*============================================================================= + 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_09242011_1744) +#define BOOST_FUSION_AT_IMPL_09242011_1744 + +#include <tuple> +#include <utility> +#include <boost/mpl/eval_if.hpp> +#include <boost/fusion/support/detail/access.hpp> +#include <boost/type_traits/remove_const.hpp> + +namespace boost { namespace fusion +{ + struct std_tuple_tag; + + namespace extension + { + template<typename T> + struct at_impl; + + template <> + struct at_impl<std_tuple_tag> + { + template <typename Sequence, typename N> + struct apply + { + typedef typename remove_const<Sequence>::type seq_type; + typedef std::tuple_element<N::value, seq_type> element; + + typedef typename + mpl::eval_if< + is_const<Sequence> + , fusion::detail::cref_result<element> + , fusion::detail::ref_result<element> + >::type + type; + + static type + call(Sequence& seq) + { + return std::get<N::value>(seq); + } + }; + }; + } +}} + +#endif |