bind_member_variable.hpp

Boost provides free peer-reviewed portable C++ source libraries. We emphasize libraries that work

/*=============================================================================
    Copyright (c) 2001-2007 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)
==============================================================================*/
#ifndef PHOENIX_BIND_BIND_MEMBER_VARIABLE_HPP
#define PHOENIX_BIND_BIND_MEMBER_VARIABLE_HPP

#include <boost/spirit/home/phoenix/core/actor.hpp>
#include <boost/spirit/home/phoenix/core/compose.hpp>
#include <boost/spirit/home/phoenix/core/reference.hpp>
#include <boost/spirit/home/phoenix/core/detail/function_eval.hpp>

namespace boost { namespace phoenix
{
    namespace detail
    {
        template <typename RT, typename MP>
        struct member_variable
        {
            template <typename Class>
            struct result
            {
                typedef RT& type;
            };

            member_variable(MP mp)
                : mp(mp) {}

            template <typename Class>
            RT& operator()(Class& obj) const
            {
                return obj.*mp;
            }

            template <typename Class>
            RT& operator()(Class* obj) const
            {
                return obj->*mp;
            }

            MP mp;
        };
    }

    template <typename RT, typename ClassT, typename ClassA>
    inline actor<
        typename as_composite<
            detail::function_eval<1>
          , detail::member_variable<RT, RT ClassT::*>
          , ClassA
        >::type>
    bind(RT ClassT::*mp, ClassA const& obj)
    {
        typedef detail::member_variable<RT, RT ClassT::*> mp_type;
        return compose<detail::function_eval<1> >(mp_type(mp), obj);
    }

    template <typename RT, typename ClassT>
    inline actor<
        typename as_composite<
            detail::function_eval<1>
          , detail::member_variable<RT, RT ClassT::*>
          , actor<reference<ClassT> >
        >::type>
    bind(RT ClassT::*mp, ClassT& obj)
    {
        typedef detail::member_variable<RT, RT ClassT::*> mp_type;
        return compose<detail::function_eval<1> >(
            mp_type(mp)
          , actor<reference<ClassT> >(reference<ClassT>(obj)));
    }
}}

#endif