tag_of.hpp

来自「Boost provides free peer-reviewed portab」· HPP 代码 · 共 64 行

/*=============================================================================
    Copyright (c) 2001-2006 Joel de Guzman

    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)
==============================================================================*/
#if !defined(BOOST_FUSION_TAG_OF_09262006_1900)
#define BOOST_FUSION_TAG_OF_09262006_1900

#include <boost/fusion/support/tag_of_fwd.hpp>

namespace boost { namespace tuples
{
    struct null_type;
    
    template <
        class T0, class T1, class T2, class T3, class T4, 
        class T5, class T6, class T7, class T8, class T9
    >
    class tuple;

    template <class Head, class Tail>
    struct cons;
}}
    
namespace boost { namespace fusion 
{
    struct boost_tuple_tag;

    namespace traits
    {
        template <
            class T0, class T1, class T2, class T3, class T4, 
            class T5, class T6, class T7, class T8, class T9
        >
#if defined(BOOST_NO_PARTIAL_SPECIALIZATION_IMPLICIT_DEFAULT_ARGS)
        struct tag_of<tuples::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9>, void >
#else
        struct tag_of<tuples::tuple<T0, T1, T2, T3, T4, T5, T6, T7, T8, T9> >
#endif
        {
            typedef boost_tuple_tag type;
        };

        template <class Head, class Tail>
#if defined(BOOST_NO_PARTIAL_SPECIALIZATION_IMPLICIT_DEFAULT_ARGS)
        struct tag_of<tuples::cons<Head, Tail>, void >
#else
        struct tag_of<tuples::cons<Head, Tail> >
#endif
        {
            typedef boost_tuple_tag type;
        };

        template <>
        struct tag_of<tuples::null_type>
        {
            typedef boost_tuple_tag type;
        };   
    }
}}

#endif