139     using Fnc = decltype(f);  in TEST()  typedef
141 …static_assert(!sdbus::is_async_method_v<Fnc>, "Free function incorrectly detected as async method"…  in TEST()
142 …static_assert(std::is_same<sdbus::function_arguments_t<Fnc>, std::tuple<>>::value, "Incorrectly de…  in TEST()
143 …static_assert(std::is_same<sdbus::tuple_of_function_input_arg_types_t<Fnc>, std::tuple<>>::value, …  in TEST()
144 …static_assert(std::is_same<sdbus::tuple_of_function_output_arg_types_t<Fnc>, void>::value, "Incorr…  in TEST()
145 …static_assert(sdbus::function_argument_count_v<Fnc> == 0, "Incorrectly detected free function para…  in TEST()
146 …static_assert(std::is_void<sdbus::function_result_t<Fnc>>::value, "Incorrectly detected free funct…  in TEST()
152     using Fnc = decltype(f);  in TEST()  typedef
154 …static_assert(!sdbus::is_async_method_v<Fnc>, "Free function incorrectly detected as async method"…  in TEST()
155 …static_assert(std::is_same<sdbus::function_arguments_t<Fnc>, std::tuple<double&, const char*, int>…  in TEST()
156 …static_assert(std::is_same<sdbus::tuple_of_function_input_arg_types_t<Fnc>, std::tuple<double, con…  in TEST()
157 …static_assert(std::is_same<sdbus::tuple_of_function_output_arg_types_t<Fnc>, std::tuple<char, int>…  in TEST()
158 …static_assert(sdbus::function_argument_count_v<Fnc> == 3, "Incorrectly detected free function para…  in TEST()
159 …static_assert(std::is_same<sdbus::function_result_t<Fnc>, std::tuple<char, int>>::value, "Incorrec…  in TEST()
165     using Fnc = decltype(f);  in TEST()  typedef
167 …static_assert(sdbus::is_async_method_v<Fnc>, "Free async function incorrectly detected as sync met…  in TEST()
168 …static_assert(std::is_same<sdbus::function_arguments_t<Fnc>, std::tuple<double&, const char*, int>…  in TEST()
169 …static_assert(std::is_same<sdbus::tuple_of_function_input_arg_types_t<Fnc>, std::tuple<double, con…  in TEST()
170 …static_assert(std::is_same<sdbus::tuple_of_function_output_arg_types_t<Fnc>, std::tuple<char, int>…  in TEST()
171 …static_assert(sdbus::function_argument_count_v<Fnc> == 3, "Incorrectly detected free function para…  in TEST()
172 …static_assert(std::is_same<sdbus::function_result_t<Fnc>, std::tuple<char, int>>::value, "Incorrec…  in TEST()