std::chrono::duration<Rep,Period>::zero - cppreference.com (original) (raw)

| 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 #include   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] |