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/Src/Dependencies/Boost/boost/proto/functional/fusion/reverse.hpp

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C++ Header | 60 lines | 35 code | 9 blank | 16 comment | 0 complexity | ac20ea980d55532aefb51ec75b57017b MD5 | raw file
 1///////////////////////////////////////////////////////////////////////////////
 2/// \file reverse.hpp
 3/// Proto callables Fusion reverse
 4//
 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)
 8
 9#ifndef BOOST_PROTO_FUNCTIONAL_FUSION_REVERSE_HPP_EAN_11_27_2010
10#define BOOST_PROTO_FUNCTIONAL_FUSION_REVERSE_HPP_EAN_11_27_2010
11
12#include <boost/fusion/include/reverse.hpp>
13#include <boost/proto/proto_fwd.hpp>
14
15namespace boost { namespace proto { namespace functional
16{
17    /// \brief A PolymorphicFunctionObject type that invokes the
18    /// \c fusion::reverse() algorithm on its argument.
19    ///
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
24    /// expression node.
25    struct reverse
26    {
27        BOOST_PROTO_CALLABLE()
28
29        template<typename Sig>
30        struct result;
31
32        template<typename This, typename Seq>
33        struct result<This(Seq)>
34          : result<This(Seq const &)>
35        {};
36
37        template<typename This, typename Seq>
38        struct result<This(Seq &)>
39          : fusion::result_of::reverse<Seq>
40        {};
41
42        template<typename Seq>
43        typename fusion::result_of::reverse<Seq>::type
44        operator ()(Seq &seq) const
45        {
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);
49        }
50
51        template<typename Seq>
52        typename fusion::result_of::reverse<Seq const>::type
53        operator ()(Seq const &seq) const
54        {
55            return fusion::reverse(seq);
56        }
57    };
58}}}
59
60#endif