adapt_deref_traits.hpp

C++的一个好库。。。现在很流行

/*=============================================================================
    Copyright (c) 2003 Joel de Guzman
    Copyright (c) 2004 Peder Holt

    Use, modification and distribution is subject to 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(FUSION_ADAPT_DEREF_TRAITS_HPP)
#define FUSION_ADAPT_DEREF_TRAITS_HPP

#include <boost/spirit/fusion/iterator/deref.hpp>

namespace boost { namespace fusion { namespace detail
{
    namespace adapt_deref_detail {
        template<typename Iterator>
        struct deref_traits_impl
        {
            typedef typename
                meta::deref<typename Iterator::first_type>::type
            type;

            static type
            call(Iterator const& i);
        };        

        template<typename Iterator>
        typename deref_traits_impl<Iterator>::type
        deref_traits_impl<Iterator>::call(Iterator const& i)
        {
            return *i.first;
        }
    }
    struct adapt_deref_traits {
        template<typename Iterator>
        struct apply : adapt_deref_detail::deref_traits_impl<Iterator>
        {};
    };

}}}

#endif