single_view_iterator.hpp

来自「CGAL is a collaborative effort of severa」· HPP 代码 · 共 49 行

/*=============================================================================
    Copyright (c) 2003 Joel de Guzman

    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_ITERATOR_SINGLE_VIEW_ITERATOR_HPP)
#define FUSION_ITERATOR_SINGLE_VIEW_ITERATOR_HPP

#include <boost/spirit/fusion/detail/access.hpp>
#include <boost/spirit/fusion/sequence/detail/as_tuple_element.hpp>
#include <boost/spirit/fusion/iterator/detail/iterator_base.hpp>
#include <boost/spirit/fusion/iterator/detail/single_view_iterator/deref_traits.hpp>
#include <boost/spirit/fusion/iterator/detail/single_view_iterator/next_traits.hpp>
#include <boost/spirit/fusion/iterator/detail/single_view_iterator/value_traits.hpp>

namespace boost { namespace fusion
{
    struct single_view_iterator_tag;

    template <typename T>
    struct single_view_iterator_end
        : iterator_base<single_view_iterator_end<T> >
    {
        typedef single_view_iterator_tag tag;
    };

    template <typename T>
    struct single_view_iterator
        : iterator_base<single_view_iterator<T> >
    {
        typedef single_view_iterator_tag tag;
        typedef typename detail::as_tuple_element<T>::type value_type;

        single_view_iterator()
            : val() {}

        explicit single_view_iterator(typename detail::call_param<T>::type val)
            : val(val) {}

        value_type val;
    };
}}

#endif