Computes difference between two calendar times as std::time_t objects (time_end - time_beg) in seconds. If time_end refers to time point before time_beg then the result is negative.
[edit] Parameters time_beg, time_end - times to compare [edit] Return valueDifference between two times in seconds.
[edit] NotesOn POSIX systems, std::time_t is measured in seconds, and difftime is equivalent to arithmetic subtraction, but C and C++ allow fractional units for time_t.
#include <ctime>
#include <iostream>
int main()
{
std::time_t start = std::time(nullptr);
volatile double d = 1.0;
// some time-consuming operation
for (int p = 0; p < 10000; ++p)
for (int q = 0; q < 100000; ++q)
d = d + p * d * q + d;
std::cout << "Wall time passed: "
<< std::difftime(std::time(nullptr), start) << " s.\n";
}
Possible output:
[edit] See alsoRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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