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Showing content from http://en.cppreference.com/w/cpp/ranges/../../cpp/../cpp/symbol_index/../chrono/duration/abs.html below:

std::chrono::abs(std::chrono::duration) - cppreference.com

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.

Absolute value of d.

#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

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