/*=============================================================================
Copyright (c) 1999-2003 Jaakko Järvi
Copyright (c) 2001-2003 Joel de Guzman
Use, modification and distribution is subject to 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)
==============================================================================*/
#if !defined(FUSION_SEQUENCE_TIE_HPP)
#define FUSION_SEQUENCE_TIE_HPP
#include <boost/ref.hpp>
#include <boost/preprocessor/repetition/enum.hpp>
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/preprocessor/repetition/repeat_from_to.hpp>
#include <boost/spirit/fusion/sequence/tuple.hpp>
namespace boost { namespace fusion
{
// Swallows any assignment (by Doug Gregor)
namespace detail
{
struct swallow_assign
{
template<typename T>
swallow_assign const&
operator=(const T&) const
{
return *this;
}
};
}
// "ignore" allows tuple positions to be ignored when using "tie".
detail::swallow_assign const ignore = detail::swallow_assign();
#define FUSION_REFERENCE_TYPE(z, n, data) \
BOOST_PP_CAT(T, n)&
#define FUSION_TIE(z, n, _) \
\
template <BOOST_PP_ENUM_PARAMS(n, typename T)> \
inline tuple<BOOST_PP_ENUM(n, FUSION_REFERENCE_TYPE, _)> \
tie(BOOST_PP_ENUM_BINARY_PARAMS(n, T, & _)) \
{ \
return tuple<BOOST_PP_ENUM(n, FUSION_REFERENCE_TYPE, _)>( \
BOOST_PP_ENUM_PARAMS(n, _)); \
}
BOOST_PP_REPEAT_FROM_TO(1, FUSION_MAX_TUPLE_SIZE, FUSION_TIE, _)
#undef FUSION_REFERENCE_TYPE
#undef FUSION_TIE
}}
#endif