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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2006 Dan Marsden
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(FUSION_VALUE_AT_KEY_05052005_0229)
#define FUSION_VALUE_AT_KEY_05052005_0229
#include <boost/mpl/int.hpp>
#include <boost/fusion/sequence/intrinsic_fwd.hpp>
#include <boost/fusion/iterator/value_of_data.hpp>
#include <boost/fusion/algorithm/query/find.hpp>
#include <boost/fusion/support/tag_of.hpp>
namespace boost { namespace fusion
{
// Special tags:
struct sequence_facade_tag;
struct boost_array_tag; // boost::array tag
struct mpl_sequence_tag; // mpl sequence tag
struct std_pair_tag; // std::pair tag
namespace extension
{
template <typename Tag>
struct value_at_key_impl
{
template <typename Seq, typename Key>
struct apply
: result_of::value_of_data<
typename result_of::find<Seq, Key>::type
>
{};
};
template <>
struct value_at_key_impl<sequence_facade_tag>
{
template <typename Sequence, typename Key>
struct apply : Sequence::template value_at_key<Sequence, Key> {};
};
template <>
struct value_at_key_impl<boost_array_tag>;
template <>
struct value_at_key_impl<mpl_sequence_tag>;
template <>
struct value_at_key_impl<std_pair_tag>;
}
namespace result_of
{
template <typename Sequence, typename N>
struct value_at_key
: extension::value_at_key_impl<typename detail::tag_of<Sequence>::type>::
template apply<Sequence, N>
{};
}
}}
#endif
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