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/*=============================================================================
Copyright (c) 2005-2008 Hartmut Kaiser
Copyright (c) 2005-2007 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)
==============================================================================*/
#ifndef PHOENIX_SEQUENCE_AT_HPP
#define PHOENIX_SEQUENCE_AT_HPP
#include <boost/fusion/include/at.hpp>
#include <boost/spirit/home/phoenix/core/actor.hpp>
#include <boost/spirit/home/phoenix/core/compose.hpp>
#include <boost/type_traits/remove_reference.hpp>
namespace boost { namespace phoenix
{
template <int N>
struct at_eval
{
template <typename Env, typename Tuple>
struct result
{
typedef typename Tuple::template result<Env>::type tuple;
typedef typename
fusion::result_of::at_c<
typename remove_reference<tuple>::type, N
>::type
type;
};
template <typename RT, typename Env, typename Tuple>
static RT
eval(Env const& env, Tuple const& t)
{
return fusion::at_c<N>(t.eval(env));
}
};
template <int N, typename Tuple>
inline actor<typename as_composite<at_eval<N>, Tuple>::type>
at_c(Tuple const& tup)
{
return compose<at_eval<N> >(tup);
}
}}
#endif
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