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Add boost::variant

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bunnei 2016-08-08 21:33:33 -04:00
parent 2dcb9d9796
commit ba070fe982
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boost/variant/detail/apply_visitor_unary.hpp Normal file
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//-----------------------------------------------------------------------------
// 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:
//
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);
}
} // namespace boost
#endif // BOOST_VARIANT_DETAIL_APPLY_VISITOR_UNARY_HPP