Defined in header <ctime> | ||
|---|---|---|
struct timespec; | (since C++17) |
Structure holding an interval broken down into seconds and nanoseconds.
std::time_t tv_sec | whole seconds – >= 0 |
long tv_nsec | nanoseconds – [0, 999999999] |
The declaration order of tv_sec and tv_nsec is unspecified. Implementation may add other data members to timespec.
The type of tv_nsec is long long on some platforms, which is currently non-conforming in C++, but is conforming since C23.
#include <ctime>
#include <iostream>
int main()
{
std::timespec ts;
std::timespec_get(&ts, TIME_UTC);
char buff[0x80];
std::strftime(buff, sizeof buff, "%D %T", std::gmtime(&ts.tv_sec));
// auto [sec, nsec] = ts; // UB: structured bindings should not be used because the
// declaration order and data member list are unspecified
std::cout << "Current time: " << buff << " (UTC)\n"
<< "Raw timespec.time_t: " << ts.tv_sec << '\n'
<< "Raw timespec.tv_nsec: " << ts.tv_nsec << '\n';
}Possible output:
Current time: 04/06/23 12:03:31 (UTC) Raw timespec.time_t: 1680782611 Raw timespec.tv_nsec: 678437213
|
(C++17) | returns the calendar time in seconds and nanoseconds based on a given time base (function) |
| calendar time type (class) |
|
C documentation for timespec |
|
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