std::chrono::abs(std::chrono::duration)

template< class Rep, class Period >
constexpr std::chrono::duration<Rep, Period> abs( std::chrono::duration<Rep, Period> d );

Returns the absolute value of the duration d. Specifically, if d >= d.zero(), return d, otherwise return -d.

The function does not participate in the overload resolution unless std::numeric_limits<Rep>::is_signed is true.

Parameters

Return value

Absolute value of d.

Possible implementation

template<class Rep, class Period,
    class = std::enable_if_t<std::numeric_limits<Rep>::is_signed>>
constexpr std::chrono::duration<Rep, Period> abs(std::chrono::duration<Rep, Period> d)
{
    return d >= d.zero() ? +d : -d;
}

Example

#include <chrono>
#include <iostream>
 
int main()
{
    using namespace std::chrono;
 
    static_assert(abs(-42s) == std::chrono::abs(42s));
 
    std::cout << "abs(+3min) = " << abs(3min).count() << '\n'
              << "abs(-3min) = " << abs(-3min).count() << '\n';
}

abs(+3min) = 3
abs(-3min) = 3

See also