/////////////////////////////////////////////////////////////////////////////// /// \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 #include 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 struct result; template struct result : result {}; template struct result : fusion::result_of::reverse {}; template typename fusion::result_of::reverse::type operator ()(Seq &seq) const { // Work around a const-correctness issue in Fusion typedef typename fusion::result_of::reverse::type result_type; return result_type(seq); } template typename fusion::result_of::reverse::type operator ()(Seq const &seq) const { return fusion::reverse(seq); } }; }}} #endif