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///////////////////////////////////////////////////////////////////////////////
/// \file at.hpp
/// Proto callables Fusion at
//
// Copyright 2010 Eric Niebler. 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 BOOST_PROTO_FUNCTIONAL_FUSION_AT_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_AT_HPP_EAN_11_27_2010
#include <boost/type_traits/add_const.hpp>
#include <boost/type_traits/remove_const.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/fusion/include/at.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c fusion::at() accessor on its argument.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c fusion::at() accessor on its argument.
struct at
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Seq, typename N>
struct result<This(Seq, N)>
: fusion::result_of::at<
typename boost::remove_reference<Seq>::type
, typename boost::remove_const<typename boost::remove_reference<N>::type>::type
>
{};
template<typename Seq, typename N>
typename fusion::result_of::at<Seq, N>::type
operator ()(Seq &seq, N const & BOOST_PROTO_DISABLE_IF_IS_CONST(Seq)) const
{
return fusion::at<N>(seq);
}
template<typename Seq, typename N>
typename fusion::result_of::at<Seq const, N>::type
operator ()(Seq const &seq, N const &) const
{
return fusion::at<N>(seq);
}
};
}}}
#endif
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