std::chrono::duration

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Defined in header `<chrono>`
Defined in namespace `std::chrono`

template <class Rep, class Period = std::ratio<1> > class duration;		(C++11 feature)

Class template std::duration represents a time interval. It is represented by a count of ticks and a tick period, where the tick period is the number of seconds from one tick to the next, represented as a compile-time rational constant.


Type	Definition

`nanoseconds`	duration type with Period std::nano

`microseconds`	duration type with Period std::micro

`milliseconds`	duration type with Period std::milli

`seconds`	duration type with Period std::ratio<1>

`minutes`	duration type with Period std::ratio<60>

`hours`	duration type with Period std::ratio<3600>

[edit] Non-member functions

std::common_type<std::chrono::duration>

specializes the std::common_type trait
(class template specialization)

operator+ operator- operator* operator/ operator%

implements arithmetic operations between two durations
(public member function)

operator== operator!= operator< operator<= operator> operator>=

compares two durations
(public member function)

duration_cast

converts a duration to another, with a different tick interval
(public member function)

[edit] Helper classes

treat_as_floating_point

indicates that a duration is convertible to duration with different tick period
(class template)

duration_values

constructs zero, min, and max values of a tick count of given type
(class template)

[edit] Example

This example measures the execution time of a function

#include <iostream>
#include <chrono>
#include <thread>
void f()
{
    std::this_thread::sleep_for(std::chrono::seconds(1));
}
int main()
{
    auto t1 = std::chrono::high_resolution_clock::now();
    f();
    auto t2 = std::chrono::high_resolution_clock::now();
    std::cout << "f() took "
              << std::chrono::duration_cast<std::chrono::milliseconds>(t2-t1).count()
              << " milliseconds\n";
}

Output:

f() took 1000 milliseconds


Member type	Definition

`rep`	`Rep`, an arithmetic type representing the number of ticks

`period`	`Period`, an std::ratio type representing the tick period

std::chrono::duration

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Contents

[edit] Member types

[edit] Member functions

[edit] Non-member types

[edit] Non-member functions

[edit] Helper classes

[edit] Example