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/*=============================================================================
Copyright (c) 2014 Kohei Takahashi
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)
==============================================================================*/
#ifndef FUSION_VALUE_AT_IMPL_16122014_1641
#define FUSION_VALUE_AT_IMPL_16122014_1641
#include <boost/config.hpp>
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/container/vector/detail/config.hpp>
///////////////////////////////////////////////////////////////////////////////
// Without variadics, we will use the PP version
///////////////////////////////////////////////////////////////////////////////
#if !defined(BOOST_FUSION_HAS_VARIADIC_VECTOR)
# include <boost/fusion/container/vector/detail/cpp03/value_at_impl.hpp>
#else
///////////////////////////////////////////////////////////////////////////////
// C++11 interface
///////////////////////////////////////////////////////////////////////////////
#include <boost/fusion/container/vector/vector_fwd.hpp>
#include <boost/type_traits/declval.hpp>
#include <boost/type_traits/remove_cv.hpp>
namespace boost { namespace fusion
{
struct vector_tag;
namespace vector_detail
{
template <typename I, typename ...T>
struct vector_data;
}
namespace extension
{
template <typename Tag>
struct value_at_impl;
template <>
struct value_at_impl<vector_tag>
{
template <typename Sequence, typename N>
struct apply
{
typedef typename boost::remove_cv<Sequence>::type seq;
typedef typename mpl::identity<decltype(seq::template value_at_impl<N::value>(boost::declval<seq*>()))>::type::type type;
};
};
}
}}
#endif
#endif
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