//----------------------------------------------------------------------------- | |
// boost variant/detail/apply_visitor_unary.hpp header file | |
// See http://www.boost.org for updates, documentation, and revision history. | |
//----------------------------------------------------------------------------- | |
// | |
// Copyright (c) 2002-2003 | |
// 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_APPLY_VISITOR_UNARY_HPP | |
#define BOOST_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP | |
#include "boost/config.hpp" | |
#include "boost/detail/workaround.hpp" | |
#include "boost/variant/detail/generic_result_type.hpp" | |
#if BOOST_WORKAROUND(__EDG__, BOOST_TESTED_AT(302)) | |
#include "boost/utility/enable_if.hpp" | |
#include "boost/mpl/not.hpp" | |
#include "boost/type_traits/is_const.hpp" | |
#endif | |
namespace boost { | |
////////////////////////////////////////////////////////////////////////// | |
// function template apply_visitor(visitor, visitable) | |
// | |
// Visits visitable with visitor. | |
// | |
// | |
// nonconst-visitor version: | |
// | |
#if !BOOST_WORKAROUND(__EDG__, BOOST_TESTED_AT(302)) | |
# define BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(V) \ | |
BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename V::result_type) \ | |
/**/ | |
#else // EDG-based compilers | |
# define BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(V) \ | |
typename enable_if< \ | |
mpl::not_< is_const< V > > \ | |
, BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename V::result_type) \ | |
>::type \ | |
/**/ | |
#endif // EDG-based compilers workaround | |
template <typename Visitor, typename Visitable> | |
inline | |
BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE(Visitor) | |
apply_visitor(Visitor& visitor, Visitable& visitable) | |
{ | |
return visitable.apply_visitor(visitor); | |
} | |
#undef BOOST_VARIANT_AUX_APPLY_VISITOR_NON_CONST_RESULT_TYPE | |
// | |
// const-visitor version: | |
// | |
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) | |
template <typename Visitor, typename Visitable> | |
inline | |
BOOST_VARIANT_AUX_GENERIC_RESULT_TYPE(typename Visitor::result_type) | |
apply_visitor(const Visitor& visitor, Visitable& visitable) | |
{ | |
return visitable.apply_visitor(visitor); | |
} | |
#endif // MSVC7 and below exclusion | |
} // namespace boost | |
#endif // BOOST_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP |