std::chrono::high_resolution_clock::now (3) Linux Manual Page
std::chrono::high_resolution_clock::now – std::chrono::high_resolution_clock::now
Synopsis
static std::chrono::time_point<std::chrono::high_resolution_clock> now() noexcept; (since C++11)Returns a time point representing the current point in time.
Parameters
(none)
Return value
A time point representing the current time.
Example
// Run this code
#include <iostream>
#include <vector>
#include <numeric>
#include <chrono>
volatile int sink;
int main()
{
for (auto size = 1ull; size < 1000000000ull; size *= 100) {
// record start time
auto start = std::chrono::high_resolution_clock::now();
// do some work
std::vector<int> v(size, 42);
sink = std::accumulate(v.begin(), v.end(), 0u); // make sure it's a side effect
// record end time
auto end = std::chrono::high_resolution_clock::now();
std::chrono::duration<double> diff = end - start;
std::cout << "Time to fill and iterate a vector of "
<< size << " ints : " << diff.count() << " s\n";
}
}
Possible output: