1 // Boost result_of library
3 // Copyright Douglas Gregor 2004. Use, modification and
4 // distribution is subject to the Boost Software License, Version
5 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
8 // For more information, see http://www.boost.org/libs/utility
9 #ifndef BOOST_RESULT_OF_HPP
10 #define BOOST_RESULT_OF_HPP
12 #include <boost/config.hpp>
13 #include <boost/preprocessor/iteration/iterate.hpp>
14 #include <boost/preprocessor/punctuation/comma_if.hpp>
15 #include <boost/preprocessor/repetition/enum_params.hpp>
16 #include <boost/preprocessor/repetition/enum_shifted_params.hpp>
17 #include <boost/detail/workaround.hpp>
18 #include <boost/mpl/has_xxx.hpp>
19 #include <boost/mpl/if.hpp>
20 #include <boost/mpl/bool.hpp>
21 #include <boost/mpl/or.hpp>
22 #include <boost/type_traits/is_pointer.hpp>
23 #include <boost/type_traits/is_member_function_pointer.hpp>
24 #include <boost/type_traits/remove_cv.hpp>
26 #ifndef BOOST_RESULT_OF_NUM_ARGS
27 # define BOOST_RESULT_OF_NUM_ARGS 10
32 template<typename F> struct result_of;
33 template<typename F> struct tr1_result_of; // a TR1-style implementation of result_of
35 #if !defined(BOOST_NO_SFINAE) && !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
38 BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
40 template<typename F, typename FArgs, bool HasResultType> struct tr1_result_of_impl;
41 template<typename F> struct cpp0x_result_of_impl;
44 struct result_of_void_impl
50 struct result_of_void_impl<R (*)(void)>
56 struct result_of_void_impl<R (&)(void)>
61 // Determine the return type of a function pointer or pointer to member.
62 template<typename F, typename FArgs>
63 struct result_of_pointer
64 : tr1_result_of_impl<typename remove_cv<F>::type, FArgs, false> { };
66 template<typename F, typename FArgs>
67 struct tr1_result_of_impl<F, FArgs, true>
69 typedef typename F::result_type type;
72 template<typename FArgs>
73 struct is_function_with_no_args : mpl::false_ {};
76 struct is_function_with_no_args<F(void)> : mpl::true_ {};
78 template<typename F, typename FArgs>
79 struct result_of_nested_result : F::template result<FArgs>
82 template<typename F, typename FArgs>
83 struct tr1_result_of_impl<F, FArgs, false>
84 : mpl::if_<is_function_with_no_args<FArgs>,
85 result_of_void_impl<F>,
86 result_of_nested_result<F, FArgs> >::type
89 } // end namespace detail
91 #define BOOST_PP_ITERATION_PARAMS_1 (3,(0,BOOST_RESULT_OF_NUM_ARGS,<boost/utility/detail/result_of_iterate.hpp>))
92 #include BOOST_PP_ITERATE()
95 # define BOOST_NO_RESULT_OF 1
100 #endif // BOOST_RESULT_OF_HPP