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std::chrono::steady_clock::now

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< cpp‎ | chrono‎ | steady clock
Revision as of 16:00, 2 November 2012 by P12bot (Talk | contribs)

(since C++11)

Returns a time point representing with the current point in time.

Contents

Parameters

(none)

Return value

A time point representing the current time.

Exceptions

noexcept specification:  
noexcept
  

Example

#include <iostream>
#include <vector>
#include <chrono>
 
int main()
{
    for (unsigned long long size = 1; size < 10000000; size *= 10) {
 
        auto start = std::chrono::steady_clock::now();   // a "timepoint" representing now
 
        std::vector<int> v(size, 42);               // something that takes some time to do
 
        auto end = std::chrono::steady_clock::now();     // the new current "timepoint"
 
        auto elapsed = end - start;                 // difference is a "duration"
 
        std::cout << size << ": " << elapsed.count() << '\n';  // clock ticks (seconds)
    }
}

Possible output:

1: 1
10: 2
100: 3
1000: 6
10000: 47
100000: 507
1000000: 4822