std::chrono::steady_clock::now

 

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Date and time library

Time point time_point (C++11) clock_time_conversion (C++20)   clock_cast (C++20) Duration duration (C++11) Clocks system_clock (C++11) steady_clock (C++11) is_clock (C++20) utc_clock (C++20) tai_clock (C++20) high_resolution_clock (C++11) gps_clock (C++20) file_clock (C++20) local_t (C++20) Time of day is_amis_pm (C++20)(C++20) make12make24 (C++20)(C++20) hh_mm_ss (C++20)

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Time zone tzdb (C++20) tzdb_list (C++20) get_tzdbget_tzdb_listreload_tzdbremote_version (C++20)(C++20)(C++20)(C++20) sys_info (C++20) local_info (C++20) nonexistent_local_time (C++20) ambiguous_local_time (C++20) locate_zone (C++20) current_zone (C++20) time_zone (C++20) choose (C++20) zoned_traits (C++20) zoned_time (C++20) time_zone_link (C++20) leap_second (C++20) leap_second_info (C++20) get_leap_second_info (C++20) C-style date and time

 

std::chrono::steady_clock

Member functions

steady_clock::now

 

static std::chrono::time_point<std::chrono::steady_clock> now() noexcept;		(since C++11)

Returns a time point representing the current point in time.

Return value

A time point representing the current time.

Example

Run this code

#include <chrono>
#include <cstddef>
#include <iomanip>
#include <iostream>
#include <numeric>
#include <vector>

volatile int sink; // prevents optimization

void do_some_work(std::size_t size)
{
    std::vector<int> v(size, 42);
    sink = std::accumulate(v.begin(), v.end(), 0); // ensures side effect
}

int main()
{
    std::cout << std::fixed << std::setprecision(9) << std::left;
    for (auto size{1ull}; size < 1000'000'000ull; size *= 100)
    {
        const auto start = std::chrono::steady_clock::now();
        do_some_work(size);
        const auto end = std::chrono::steady_clock::now();
        const std::chrono::duration<double> diff = end - start;
        
        std::cout << "diff = " << diff << "; size = " << size << '\n';
    }
}

Possible output:

diff = 0.000005415s; size = 1
diff = 0.000001986s; size = 100
diff = 0.000051633s; size = 10000
diff = 0.006043920s; size = 1000000
diff = 0.636128648s; size = 100000000