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std::chrono...weekday::ok(3)  C++ Standard Libary std::chrono...weekday::ok(3)

NAME
       std::chrono::month_weekday::ok -	std::chrono::month_weekday::ok

Synopsis
	  constexpr bool ok() const noexcept;  (since C++20)

	  Checks if the	contained month	and weekday_indexed objects are	valid.

Return value
	  month().ok() && weekday_indexed().ok()

Example
       // Run this code

	#include <iostream>
	#include <chrono>

	int main()
	{
	    std::cout << std::boolalpha;

	    auto mwdi {std::chrono::March/std::chrono::Friday[1]};
	    std::cout << (mwdi.ok()) <<	' ';
	    mwdi = {std::chrono::month(17)/std::chrono::Friday[1]};
	    std::cout << (mwdi.ok()) <<	' ';
	    mwdi = {std::chrono::March/std::chrono::Friday[-4]};
	    std::cout << (mwdi.ok()) <<	'\n';
	}

Output:
	true false false

http://cppreference.com		  2022.07.31	  std::chrono...weekday::ok(3)

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