89 lines
2.0 KiB
C++
89 lines
2.0 KiB
C++
// Boost result_of library
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// Copyright Douglas Gregor 2004. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// For more information, see http://www.boost.org/libs/utility
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#ifndef BOOST_RESULT_OF_HPP
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#define BOOST_RESULT_OF_HPP
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#include <boost/config.hpp>
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#include <boost/type_traits/ice.hpp>
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#include <boost/type.hpp>
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#include <boost/preprocessor.hpp>
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#include <boost/detail/workaround.hpp>
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#include <boost/mpl/has_xxx.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/bool.hpp>
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#ifndef BOOST_RESULT_OF_NUM_ARGS
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# define BOOST_RESULT_OF_NUM_ARGS 10
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#endif
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namespace boost {
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template<typename F> struct result_of;
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#if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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namespace detail {
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BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
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template<typename F, typename FArgs, bool HasResultType> struct result_of_impl;
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template<typename F>
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struct result_of_void_impl
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{
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typedef void type;
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};
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template<typename R>
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struct result_of_void_impl<R (*)(void)>
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{
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typedef R type;
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};
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template<typename R>
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struct result_of_void_impl<R (&)(void)>
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{
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typedef R type;
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};
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template<typename F, typename FArgs>
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struct result_of_impl<F, FArgs, true>
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{
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typedef typename F::result_type type;
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};
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template<typename FArgs>
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struct is_function_with_no_args : mpl::false_ {};
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template<typename F>
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struct is_function_with_no_args<F(void)> : mpl::true_ {};
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template<typename F, typename FArgs>
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struct result_of_nested_result : F::template result<FArgs>
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{};
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template<typename F, typename FArgs>
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struct result_of_impl<F, FArgs, false>
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: mpl::if_<is_function_with_no_args<FArgs>,
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result_of_void_impl<F>,
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result_of_nested_result<F, FArgs> >::type
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{};
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} // end namespace detail
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#define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>))
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#include BOOST_PP_ITERATE()
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#else
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# define BOOST_NO_RESULT_OF 1
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#endif
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}
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#endif // BOOST_RESULT_OF_HPP
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