// Boost result_of library

//  Copyright Douglas Gregor 2004. 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)

// For more information, see http://www.boost.org/libs/utility

#ifndef BOOST_RESULT_OF_HPP

#define BOOST_RESULT_OF_HPP

#include <boost/config.hpp>

#include <boost/type_traits/ice.hpp>

#include <boost/type.hpp>

#include <boost/preprocessor.hpp>

#include <boost/detail/workaround.hpp>

#include <boost/mpl/has_xxx.hpp>

#include <boost/mpl/if.hpp>

#include <boost/mpl/bool.hpp>

#ifndef BOOST_RESULT_OF_NUM_ARGS

#  define BOOST_RESULT_OF_NUM_ARGS 10

#endif

namespace boost {

template<typename F> struct result_of;

#if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)

namespace detail {

BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)

template<typename F, typename FArgs, bool HasResultType> struct result_of_impl;

template<typename F>

struct result_of_void_impl

{

  typedef void type;

};

template<typename R>

struct result_of_void_impl<R (*)(void)>

{

  typedef R type;

};

template<typename R>

struct result_of_void_impl<R (&)(void)>

{

  typedef R type;

};

template<typename F, typename FArgs>

struct result_of_impl<F, FArgs, true>

{

  typedef typename F::result_type type;

};

template<typename FArgs>

struct is_function_with_no_args : mpl::false_ {};

template<typename F>

struct is_function_with_no_args<F(void)> : mpl::true_ {};

template<typename F, typename FArgs>

struct result_of_nested_result : F::template result<FArgs>

{};

template<typename F, typename FArgs>

struct result_of_impl<F, FArgs, false>

  : mpl::if_<is_function_with_no_args<FArgs>,

	     result_of_void_impl<F>,

	     result_of_nested_result<F, FArgs> >::type

{};

} // end namespace detail

#define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>))

#include BOOST_PP_ITERATE()

#else

#  define BOOST_NO_RESULT_OF 1

#endif

}

#endif // BOOST_RESULT_OF_HPP