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/*=============================================================================
Copyright (c) 2001-2013 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_MAP_DETAIL_AT_KEY_IMPL_02042013_0821)
#define BOOST_FUSION_MAP_DETAIL_AT_KEY_IMPL_02042013_0821
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/support/detail/access.hpp>
#include <boost/type_traits/is_const.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/utility/declval.hpp>
namespace boost { namespace fusion
{
struct map_tag;
namespace extension
{
template <typename Tag>
struct at_key_impl;
template <>
struct at_key_impl<map_tag>
{
template <typename Sequence, typename Key>
struct apply
{
typedef
decltype(boost::declval<Sequence>().get(mpl::identity<Key>()))
type;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type
call(Sequence& m)
{
return m.get(mpl::identity<Key>());
}
};
template <typename Sequence, typename Key>
struct apply<Sequence const, Key>
{
typedef
decltype(boost::declval<Sequence const>().get(mpl::identity<Key>()))
type;
BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
static type
call(Sequence const& m)
{
return m.get(mpl::identity<Key>());
}
};
};
}
}}
#endif
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