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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
Copyright (c) 2005-2006 Dan Marsden
Copyright (c) 2018 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)
==============================================================================*/
#if !defined(BOOST_FUSION_VALUE_AT_IMPL_20061101_0745)
#define BOOST_FUSION_VALUE_AT_IMPL_20061101_0745
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/sequence/intrinsic/value_at.hpp>
#include <boost/utility/result_of.hpp>
namespace boost { namespace fusion {
struct transform_view_tag;
struct transform_view2_tag;
namespace extension
{
template<typename Tag>
struct value_at_impl;
template<>
struct value_at_impl<transform_view_tag>
{
template<typename Seq, typename N>
struct apply
{
typedef typename Seq::transform_type F;
typedef typename result_of::value_at<typename Seq::sequence_type, N>::type value_type;
typedef typename boost::result_of<F(value_type)>::type type;
};
};
template<>
struct value_at_impl<transform_view2_tag>
{
template<typename Seq, typename N>
struct apply
{
typedef typename Seq::transform_type F;
typedef typename result_of::value_at<typename Seq::sequence1_type, N>::type value1_type;
typedef typename result_of::value_at<typename Seq::sequence2_type, N>::type value2_type;
typedef typename boost::result_of<F(value1_type, value2_type)>::type type;
};
};
}
}}
#endif