Kevin Wang

std::result_of and std::result_of_t are deprecated in C++17. They are superseded by std::invoke_result and std::invoke_result_t

2

(1) (since C++14) template< class T > using result_of_t = typename result_of::type; //(deprecated in C++17) (2) (since C++17) template< class F, class... ArgTypes> using invoke_result_t = typename invoke_result::type;

Dear author I found unable to pass parameters when using your code. my code: ``` void test(){ int ret = 4; fsm::state s(STATE_ERROR); fsm.set(s(ret)); } fsm.on(STATE_ERROR, 'init') = [&](const fsm::args...