NAME¶

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

Synopsis¶

Defined in header <chrono>
template< class Rep, class Period >
constexpr std::chrono::duration<Rep, Period> abs( (since C++17)
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¶

d - duration

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¶

// Run this code

#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';
}

Output:¶

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

See also¶

operator+ implements unary + and unary -
operator- (public member function)
abs(int)
labs computes absolute value of an integral value (\(\small{|x|}\)|x|)
llabs (function)
(C++11)