push_back.hpp

来自「Boost provides free peer-reviewed portab」· HPP 代码 · 共 40 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(FUSION_PUSH_BACK_07162005_0235)
#define FUSION_PUSH_BACK_07162005_0235

#include <boost/fusion/support/detail/as_fusion_element.hpp>
#include <boost/fusion/view/joint_view/joint_view.hpp>
#include <boost/fusion/view/single_view/single_view.hpp>

namespace boost { namespace fusion
{
    namespace result_of
    {
        template <typename Sequence, typename T>
        struct push_back
        {
            typedef fusion::single_view<typename detail::as_fusion_element<T>::type> single_view;
            typedef joint_view<Sequence, single_view const> type;
        };
    }

    template <typename Sequence, typename T>
    inline typename result_of::push_back<Sequence const, T>::type
    push_back(Sequence const& seq, T const& x)
    {
        typedef typename result_of::push_back<Sequence const, T> push_back;
        typedef typename push_back::single_view single_view; 
        typedef typename push_back::type result; 
        single_view x_(x);
        return result(seq, x_);
    }
}}

#endif