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// Copyright David Abrahams 2005.
// 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_PARAMETER_AUX_RESULT_OF0_DWA2005511_HPP
#define BOOST_PARAMETER_AUX_RESULT_OF0_DWA2005511_HPP
#include <boost/parameter/aux_/use_default_tag.hpp>
#include <boost/parameter/config.hpp>
#include <boost/utility/result_of.hpp>
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
#include <boost/mp11/utility.hpp>
#include <type_traits>
#else
#include <boost/mpl/if.hpp>
#include <boost/type_traits/is_void.hpp>
#endif
namespace boost { namespace parameter { namespace aux {
// A metafunction returning the result of invoking
// a nullary function object of the given type.
template <typename F>
class result_of0
{
#if defined(BOOST_NO_RESULT_OF)
typedef typename F::result_type result_of_F;
#else
typedef typename ::boost::result_of<F()>::type result_of_F;
#endif
public:
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
using type = ::boost::mp11::mp_if<
::std::is_void<result_of_F>
#else
typedef typename ::boost::mpl::if_<
::boost::is_void<result_of_F>
#endif
, ::boost::parameter::aux::use_default_tag
, result_of_F
#if defined(BOOST_PARAMETER_CAN_USE_MP11)
>;
#else
>::type type;
#endif
};
}}} // namespace boost::parameter::aux
#endif // include guard