![]() ![]() The operator"" mysuffix() operator overload/user-defined-literal/suffix function (as of C++11) is how the strange auto time_ms = 1ms thing works above. integer scale conversion with no precision loss: no castĪDDENDUM More on "User-defined literals" (since C++11): So you can declare a variable of 1 second and change it to microseconds with no cast like this: // Create a time object of type `std::chrono::seconds` & initialize it to 1 sec Reference this cppreference community wiki page. Here are a few cases of some C++ weirdness and uses of std::chrono. Don't worry, I'll get better.) Q: Why std::chrono?Ī: Because C++ programmers like to go crazy with things, so they made it handle units for you. * (Sorry, I've been more of an embedded developer than a standard computer programmer so all this high-level, abstracted static-member-within-class-within-namespace-within-namespace-within-namespace stuff confuses me. Uint64_t ns = std::chrono::duration_cast( Uint64_t us = std::chrono::duration_cast( Std::chrono::high_resolution_clock::now().time_since_epoch()) Uint64_t ms = std::chrono::duration_cast( Your machine won't run for 200 years anyway. But.that's ok.this "bug" is designed into the C++11 specification, so HAVE *SIGNED OVERFLOW*, WHICH IS UNDEFINED BEHAVIOR (IE: A BUG) FOR C/C++. EVENTUALLY OVERFLOW (AFTER 200+ YEARS OR SO), AFTER WHICH POINT THEY WILL NB: ALL OF THESE 3 FUNCTIONS BELOW USE SIGNED VALUES INTERNALLY AND WILL high_resolution_clock (C++11) - the clock with the shortest tick period available.steady_clock (C++11) - monotonic clock that will never be adjusted.Their definitions from here ( ) are as follows: NB: In the code below, you might consider using std::chrono::steady_clock instead of std::chrono::high_resolution_clock. So, if you'd like to simplify it down and make it more "C-like", including removing all of the type-safe class stuff it does, here are 3 simple and very easy-to-use functions to get timestamps in milliseconds, microseconds, and nanoseconds.that only took me about 12 hrs to write*: The new C++11 std::chrono library is one of the most complicated piles of mess C++ I have ever seen or tried to figure out how to use, but at least it is cross-platform! ![]() Here is how to get simple C-like millisecond, microsecond, and nanosecond timestamps in C++: ![]()
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