Stone Of Days

! 5/ 5/15 mam PDF 235 The code at the top of the page will compile, but calls to setSoundB won't, because std::plus<steady_clock::time_point>'s operator() declares two parameters of type steady_clock::time_point, yet we're passing a time_point and a duration. (The reason setSoundB compiles at all is that std::bind's operator() is a template, so the type mismatch isn't detected until a call is made that causes that template to be instantiated.) One fix is to write a function taking a time_point and a duration, then use that in place of std::plus: Time addTimeAndDuration(const Time& tp, const Duration& d) { return tp + d; } auto setSoundB = std::bind(setAlarm, std::bind(addTimeAndDuration, steady_clock::now(), hours(1)), _1, seconds(30)); Another fix is to essentially implement C++14's generic std::plus ourselves. Its templatized operator() function accepts arguments of any type: struct genericAdder { template<typename T1, typename T2> auto operator()(T1&& param1, T2&& param2) ->decltype(std::forward<T1>(param1) + std::forward<T2>(param2)) { return std::forward<T1>(param1) + std::forward<T2>(param2); } }; auto setSoundB = std::bind(setAlarm, std::bind(genericAdder(), steady_clock::now(), hours(1)), _1, seconds(30));