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

std::chrono::duration<Rep,Period>::zero - cppreference.com

static constexpr duration zero();

(until C++20)

static constexpr duration zero() noexcept;

(since C++20)

Returns a zero-length duration.

If the representation rep of the duration requires some other implementation to return a zero-length duration, std::chrono::duration_values can be specialized to return the desired value.

[edit] Parameters

(none)

[edit] Return value

Returns duration(std::chrono::duration_values<rep>::zero()).

[edit] Example

#include <chrono>
#include <ratio>
 
template<typename X, typename Y>
using dura = std::chrono::duration<X, Y>;
 
static_assert
(
    (std::chrono::hours::zero() == std::chrono::nanoseconds::zero()) &&
    (dura<short, std::nano>::zero() == dura<int, std::deci>::zero()) &&
    (dura<short, std::deca>::zero() == dura<long, std::exa>::zero()) &&
    (dura<long, std::atto>::zero().count() == dura<float, std::exa>::zero().count())
);
 
int main() {}

[edit] See also returns the special duration value min
(public static member function) [edit] returns the special duration value max
(public static member function) [edit]

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