//-----------------------------------------------------------------------------

// boost variant/detail/substitute_fwd.hpp header file

// See http://www.boost.org for updates, documentation, and revision history.

//-----------------------------------------------------------------------------

//

// Copyright (c) 2003

// Eric Friedman

//

// 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 BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP

#define BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP

#include "boost/mpl/aux_/lambda_arity_param.hpp"

#include "boost/mpl/aux_/template_arity.hpp"

#include "boost/mpl/int_fwd.hpp"

///////////////////////////////////////////////////////////////////////////////

// BOOST_VARIANT_DETAIL_NO_SUBSTITUTE

//

// Defined if 'substitute' is not implementable on the current compiler.

//

#include "boost/mpl/aux_/config/ctps.hpp"

#include "boost/mpl/aux_/config/ttp.hpp"

#if defined(BOOST_NO_TEMPLATE_TEMPLATE_PARAMETERS) \

 || defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \

 && !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)

#   define BOOST_VARIANT_DETAIL_NO_SUBSTITUTE

#endif

namespace boost {

namespace detail { namespace variant {

#if !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)

///////////////////////////////////////////////////////////////////////////////

// metafunction substitute

//

// Substitutes one type for another in the given type expression.

//

template <

      typename T, typename Dest, typename Source

      BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(

          typename Arity = mpl::int_< mpl::aux::template_arity<T>::value >

        )

    >

struct substitute;

#endif // !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)

}} // namespace detail::variant

} // namespace boost

#endif // BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP