public static member function
<chrono>
std::chrono::duration::zero
static constexpr duration zero();
Zero value
Returns a duration value of zero.
The function calls duration_value::zero to obtain the zero value for its internal count object:
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static constexpr duration zero() {
return duration_values<rep>::zero();
}
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Return value
A duration object with a value of zero.
Example
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// duration::zero
#include <iostream>
#include <chrono>
int main ()
{
using std::chrono::steady_clock;
steady_clock::time_point t1 = steady_clock::now();
std::cout << "Printing out something...\n";
steady_clock::time_point t2 = steady_clock::now();
steady_clock::duration d = t2 - t1;
if ( d == steady_clock::duration::zero() )
std::cout << "The internal clock did not tick.\n";
else
std::cout << "The internal clock advanced " << d.count() << " periods.\n";
return 0;
}
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Possible output:
Printing out something...
The internal clock did not tick.
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