/////////////////////////////////////////////////////////////////////////////// | |
/// \file reverse.hpp | |
/// Proto callables Fusion reverse | |
// | |
// 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_REVERSE_HPP_EAN_11_27_2010 | |
#define BOOST_PROTO_FUNCTIONAL_FUSION_REVERSE_HPP_EAN_11_27_2010 | |
#include <boost/fusion/include/reverse.hpp> | |
#include <boost/proto/proto_fwd.hpp> | |
namespace boost { namespace proto { namespace functional | |
{ | |
/// \brief A PolymorphicFunctionObject type that invokes the | |
/// \c fusion::reverse() algorithm on its argument. | |
/// | |
/// A PolymorphicFunctionObject type that invokes the | |
/// \c fusion::reverse() algorithm on its argument. This is | |
/// useful for defining a CallableTransform like \c reverse(_) | |
/// which reverses the order of the children of a Proto | |
/// expression node. | |
struct reverse | |
{ | |
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::reverse<Seq> | |
{}; | |
template<typename Seq> | |
typename fusion::result_of::reverse<Seq>::type | |
operator ()(Seq &seq) const | |
{ | |
// Work around a const-correctness issue in Fusion | |
typedef typename fusion::result_of::reverse<Seq>::type result_type; | |
return result_type(seq); | |
} | |
template<typename Seq> | |
typename fusion::result_of::reverse<Seq const>::type | |
operator ()(Seq const &seq) const | |
{ | |
return fusion::reverse(seq); | |
} | |
}; | |
}}} | |
#endif |