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///////////////////////////////////////////////////////////////////////////////
/// \file pop_front.hpp
/// Proto callables Fusion pop_front
//
// 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_POP_FRONT_HPP_EAN_11_27_2010
#define BOOST_PROTO_FUNCTIONAL_FUSION_POP_FRONT_HPP_EAN_11_27_2010
#include <boost/fusion/include/begin.hpp>
#include <boost/fusion/include/end.hpp>
#include <boost/fusion/include/next.hpp>
#include <boost/fusion/include/pop_front.hpp>
#include <boost/proto/proto_fwd.hpp>
namespace boost { namespace proto { namespace functional
{
/// \brief A PolymorphicFunctionObject type that invokes the
/// \c fusion::pop_front() algorithm on its argument.
///
/// A PolymorphicFunctionObject type that invokes the
/// \c fusion::pop_front() algorithm on its argument. This is
/// useful for defining a CallableTransform like \c pop_front(_)
/// which removes the first child from a Proto expression node.
/// Such a transform might be used as the first argument to the
/// \c proto::fold\<\> transform; that is, fold all but
/// the first child.
struct pop_front
{
BOOST_PROTO_CALLABLE()
template<typename Sig>
struct result;
template<typename This, typename Seq>
struct result<This(Seq)>
: result<This(Seq const &)>
{};
template<typename This, typename Seq>
struct result<This(Seq &)>
: fusion::result_of::pop_front<Seq>
{};
template<typename Seq>
typename fusion::result_of::pop_front<Seq>::type
operator ()(Seq &seq) const
{
// Work around a const-correctness issue in Fusion
typedef typename fusion::result_of::pop_front<Seq>::type result_type;
return result_type(fusion::next(fusion::begin(seq)), fusion::end(seq));
}
template<typename Seq>
typename fusion::result_of::pop_front<Seq const>::type
operator ()(Seq const &seq) const
{
return fusion::pop_front(seq);
}
};
}}}
#endif
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