set/aux_/at_impl.hpp

Go to the documentation of this file.

 
#ifndef BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
#define BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED
 
// Copyright Aleksey Gurtovoy 2003-2004
//
// 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)
//
// See http://www.boost.org/libs/mpl for documentation.
 
// $Id: at_impl.hpp 13472 2017-08-22 07:53:44Z richean $
// $Date: 2017-08-22 09:53:44 +0200 (Di, 22 Aug 2017) $
// $Revision: 13472 $
 
#include <boost/mpl/at_fwd.hpp>
#include <boost/mpl/set/aux_/has_key_impl.hpp>
#include <boost/mpl/set/aux_/tag.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/void.hpp>
 
namespace boost { namespace mpl {
 
template<>
struct at_impl< aux::set_tag >
{
    template< typename Set, typename T > struct apply
    {
        typedef typename if_< 
              has_key_impl<aux::set_tag>::apply<Set,T>
            , T
            , void_
            >::type type;            
    };
};
 
}}
 
#endif // BOOST_MPL_SET_AUX_AT_IMPL_HPP_INCLUDED