1 ///////////////////////////////////////////////////////////////////////////////
3 /// Proto callables Fusion reverse
5 // Copyright 2010 Eric Niebler. Distributed under the Boost
6 // Software License, Version 1.0. (See accompanying file
7 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
9 #ifndef BOOST_PROTO_FUNCTIONAL_FUSION_REVERSE_HPP_EAN_11_27_2010
10 #define BOOST_PROTO_FUNCTIONAL_FUSION_REVERSE_HPP_EAN_11_27_2010
12 #include <boost/fusion/include/reverse.hpp>
13 #include <boost/proto/proto_fwd.hpp>
15 namespace boost { namespace proto { namespace functional
17 /// \brief A PolymorphicFunctionObject type that invokes the
18 /// \c fusion::reverse() algorithm on its argument.
20 /// A PolymorphicFunctionObject type that invokes the
21 /// \c fusion::reverse() algorithm on its argument. This is
22 /// useful for defining a CallableTransform like \c reverse(_)
23 /// which reverses the order of the children of a Proto
27 BOOST_PROTO_CALLABLE()
29 template<typename Sig>
32 template<typename This, typename Seq>
33 struct result<This(Seq)>
34 : result<This(Seq const &)>
37 template<typename This, typename Seq>
38 struct result<This(Seq &)>
39 : fusion::result_of::reverse<Seq>
42 template<typename Seq>
43 typename fusion::result_of::reverse<Seq>::type
44 operator ()(Seq &seq) const
46 // Work around a const-correctness issue in Fusion
47 typedef typename fusion::result_of::reverse<Seq>::type result_type;
48 return result_type(seq);
51 template<typename Seq>
52 typename fusion::result_of::reverse<Seq const>::type
53 operator ()(Seq const &seq) const
55 return fusion::reverse(seq);