variant/detail/substitute_fwd.hpp

0001 //-----------------------------------------------------------------------------
0002 // boost variant/detail/substitute_fwd.hpp header file
0003 // See http://www.boost.org for updates, documentation, and revision history.
0004 //-----------------------------------------------------------------------------
0005 //
0006 // Copyright (c) 2003
0007 // Eric Friedman
0008 //
0009 // Distributed under the Boost Software License, Version 1.0. (See
0010 // accompanying file LICENSE_1_0.txt or copy at
0011 // http://www.boost.org/LICENSE_1_0.txt)
0012
0013 #ifndef BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP
0014 #define BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP
0015
0016 #include <boost/mpl/aux_/lambda_arity_param.hpp>
0017 #include <boost/mpl/aux_/template_arity.hpp>
0018 #include <boost/mpl/int_fwd.hpp>
0019
0020
0021 #include <boost/mpl/aux_/config/ctps.hpp>
0022 #include <boost/mpl/aux_/config/ttp.hpp>
0023
0024 namespace boost {
0025 namespace detail { namespace variant {
0026
0027 ///////////////////////////////////////////////////////////////////////////////
0028 // metafunction substitute
0029 //
0030 // Substitutes one type for another in the given type expression.
0031 //
0032 template <
0033       typename T, typename Dest, typename Source
0034       BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(
0035           typename Arity = mpl::int_< mpl::aux::template_arity<T>::value >
0036         )
0037     >
0038 struct substitute;
0039
0040 }} // namespace detail::variant
0041 } // namespace boost
0042
0043 #endif // BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP