1//-----------------------------------------------------------------------------
2// boost variant/detail/substitute_fwd.hpp header file
3// See http://www.boost.org for updates, documentation, and revision history.
4//-----------------------------------------------------------------------------
5//
6// Copyright (c) 2003
7// Eric Friedman
8//
9// Distributed under the Boost Software License, Version 1.0. (See
10// accompanying file LICENSE_1_0.txt or copy at
11// http://www.boost.org/LICENSE_1_0.txt)
12
13#ifndef BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP
14#define BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP
15
16#include <boost/mpl/aux_/lambda_arity_param.hpp>
17#include <boost/mpl/aux_/template_arity.hpp>
18#include <boost/mpl/int_fwd.hpp>
19
20
21///////////////////////////////////////////////////////////////////////////////
22// BOOST_VARIANT_DETAIL_NO_SUBSTITUTE
23//
24// Defined if 'substitute' is not implementable on the current compiler.
25//
26
27#include <boost/mpl/aux_/config/ctps.hpp>
28#include <boost/mpl/aux_/config/ttp.hpp>
29
30#if defined(BOOST_NO_TEMPLATE_TEMPLATE_PARAMETERS) \
31 && !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
32# define BOOST_VARIANT_DETAIL_NO_SUBSTITUTE
33#endif
34
35namespace boost {
36namespace detail { namespace variant {
37
38#if !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
39
40///////////////////////////////////////////////////////////////////////////////
41// metafunction substitute
42//
43// Substitutes one type for another in the given type expression.
44//
45template <
46 typename T, typename Dest, typename Source
47 BOOST_MPL_AUX_LAMBDA_ARITY_PARAM(
48 typename Arity = mpl::int_< mpl::aux::template_arity<T>::value >
49 )
50 >
51struct substitute;
52
53#endif // !defined(BOOST_VARIANT_DETAIL_NO_SUBSTITUTE)
54
55}} // namespace detail::variant
56} // namespace boost
57
58#endif // BOOST_VARIANT_DETAIL_SUBSTITUTE_FWD_HPP
59