

#ifndef BOOST_MPL_SET_AUX_ERASE_KEY_IMPL_HPP_INCLUDED

#define BOOST_MPL_SET_AUX_ERASE_KEY_IMPL_HPP_INCLUDED



// Copyright Aleksey Gurtovoy 2003-2007

// Copyright David Abrahams 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.



// $Source$

// $Date: 2007-11-25 13:07:19 -0500 (Sun, 25 Nov 2007) $

// $Revision: 41369 $



#include <boost/mpl/erase_key_fwd.hpp>

#include <boost/mpl/set/aux_/has_key_impl.hpp>

#include <boost/mpl/set/aux_/item.hpp>

#include <boost/mpl/set/aux_/tag.hpp>

#include <boost/mpl/identity.hpp>

#include <boost/mpl/base.hpp>

#include <boost/mpl/eval_if.hpp>



#include <boost/type_traits/is_same.hpp>



namespace boost { namespace mpl {



template<>

struct erase_key_impl< aux::set_tag >

{

    template< 

          typename Set

        , typename T

        > 

    struct apply

        : eval_if< 

              has_key_impl<aux::set_tag>::apply<Set,T>

            , eval_if< 

                  is_same< T,typename Set::item_type_ > 

                , base<Set>

                , identity< s_mask<T,typename Set::item_> >

                >

            , identity<Set>

            >

    {

    };

};



}}



#endif // BOOST_MPL_SET_AUX_ERASE_KEY_IMPL_HPP_INCLUDED

