chrono

I've created a time point, but I have been struggling to print it to the terminal. #include <iostream> #include <chrono> int main(){ //set time_point to current time std::chrono::time_point<std::chrono::system_clock,std::chrono::nanoseconds> time_point; time_point = std::chrono::system_clock::now(); //print the time //... return 0; } The only documentation I can find that prints a time_point is found here: http://en.cppreference.com/w/cpp/chrono/time_point however, I'm not even able to create a time_t based on my time_point(like the example). std::time_t now_c = std::chrono::system_clock::to

I want to have the number of milliseconds since epoch. A popular solution looks like follows (one of the solutions of this question asked here Get time since epoch in milliseconds, preferably using C++11 chrono ) #include <iostream> #include <chrono> int main() { auto millitime = std::chrono::duration_cast<std::chrono::milliseconds> (std::chrono::system_clock::now().time_since_epoch()).count(); std::cout << millitime << std::endl; return 0; } compiling this with a call to g++ like g++ -std=c++11 main.cpp -o timetest results in the output 1372686001 which is equal to the number of seconds since

I tried to build a function template that can measure the execution time of functions of arbitrary type. Here is what I've tried so far: #include <chrono> #include <iostream> #include <type_traits> #include <utility> // Executes fn with arguments args and returns the time needed // and the result of f if it is not void template <class Fn, class... Args> auto timer(Fn fn, Args... args) -> std::pair<double, decltype(fn(args...))> { static_assert(!std::is_void<decltype(fn(args...))>::value, "Call timer_void if return type is void!"); auto start = std::chrono::high_resolution_clock::now(); auto

I have a stupid problem. I try to switch to the c++11 headers and one of those is chrono. But my problem is that I cant cout the result of time operations. For example: auto t=std::chrono::high_resolution_clock::now(); cout<<t.time_since_epoch(); gives: initializing argument 1 of ‘std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&) [with _CharT = char, _Traits = std::char_traits<char>, _Tp = std::chrono::duration<long int, std::ratio<1l, 1000000l> >]’ ... /usr/include/c++/4.6/ostream cout<<(uint64_t)t.time_since_epoch(); gives invalid cast

I'm definitely a bit lost with the new C++ chrono library. Here I have an update loop. It runs two operations: engine.Update() engine.Render() These are long operations, and it's hard to tell how long they are. Thus, we measure how long they took, then do some calculations and figure the best way to gradually call update before we call render. To do this, i'm using C++11's Chrono functionality. I chose it because it sounded like a good deal: More accurate, More platform dependent. I'm finding i'm hitting more problems than now now though. Following is my code, as well as my primary problem.

All I want is to get the time since epoch in milliseconds and store it in an unsigned long. I found this related question . But honestly, this can't be the easiest way to perform such a simple task, is it? I am hoping for something much simpler, but can't find anything in the std::chrono reference . Any advice is most welcome. I don't necessarily have to use std::chrono , but I want it to be platform independent. Mike Seymour unsigned long milliseconds_since_epoch = std::chrono::system_clock::now().time_since_epoch() / std::chrono::milliseconds(1); although, especially since you want platform

How can I extract the year, month, day, hour, minute, second and millisecond from an std::chrono::time_point object? I only saw examples on how to extract the total amount of e.g. seconds from a duration . You can only extract this information from a system_clock::time_point . This is the only system-supplied clock that has a relationship with the civil calendar. Here is how to get the current time_point using this clock: system_clock::time_point now = system_clock::now(); You can then convert this to a time_t with: time_t tt = system_clock::to_time_t(now); Using the C library you can then

I need to convert std::chrono::time_point to and from a long type (integer 64 bits). I´m starting working with std::chrono ... Here is my code: int main () { std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now(); auto epoch = now.time_since_epoch(); auto value = std::chrono::duration_cast<std::chrono::milliseconds>(epoch); long duration = value.count(); std::chrono::duration<long> dur(duration); std::chrono::time_point<std::chrono::system_clock> dt(dur); if (dt != now) std::cout << "Failure." << std::endl; else std::cout << "Success." << std::endl; } This