I've got a small problem caused by insufficient documentation of C++11.
I'd like to obtain a time since epoch in milliseconds, or nanoseconds or seconds and then I will have to "cast" this value to another resolution. I can do it using gettimeofday() but it will be to easy, so I tried to achieve it using std::chrono.
I tried:
std::chrono::time_point<std::chrono::system_clock> now = std::chrono::system_clock::now();
But I have no idea what is a resolution of obtained in this way time_point, and I don't know how to get this time as a simple unsigned long long, and I haven't any conception how to cast it to another resolution.
Chrono in C++ chrono is the name of a header and also of a sub-namespace: All the elements in this header (except for the common_type specializations) are not defined directly under the std namespace (like most of the standard library) but under the std::chrono namespace.
time_point::time_since_epochReturns a duration representing the amount of time between *this and the clock 's epoch.
You can do now.time_since_epoch()
to get a duration representing the time since the epoch, with the clock's resolution. To convert to milliseconds use duration_cast
:
auto duration = now.time_since_epoch(); auto millis = std::chrono::duration_cast<std::chrono::milliseconds>(duration).count();
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