Actual millis in a C++

Question

Is it possible to get the actual millis since I-don't-know in a C++-programm like System.currentTimeMillis() in Java? I know time(), but I think it's not exactly enough to measure short times, is it?

Answer 1

It's part of the language standard these days (some years now):

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#include <chrono>
#include <iostream>

int main()
{
    using namespace std::chrono;

    auto epoch = high_resolution_clock::from_time_t(0);
    // ...
    auto now   = high_resolution_clock::now();

    auto mseconds = duration_cast<milliseconds>(now - epoch).count();

    std::cout << "millis: " << mseconds;
}

Answer 2

In C++ you also have clock()

#include <time.h>

...

clock_t start = clock();
... some processing ...
clock_t stop = clock();

double elapsed = double(stop - start) / CLOCKS_PER_SEC;

There are also other more accurate ways of measure timings, but they are more dependent on which king of system you're running your programs on.