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

NAME
       std::chrono::year_month_weekday_last::ok				     -
       std::chrono::year_month_weekday_last::ok

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

	  Checks  if  this  object  represents	 a   valid   date.   Since   a
       year_month_weekday_last
	  represents  the  last	 weekday of a particular month,	it is valid as
       long as the year,
	  month	and weekday are	valid.

Return value
	  year().ok() && month().ok() && weekday().ok()

Example
       // Run this code

	#include <cassert>
	#include <chrono>
	using namespace	std::chrono;

	int main()
	{
	    auto ymwdl{Tuesday[last]/11/2020};
	    assert(ymwdl.ok());
	    ymwdl = Tuesday[last]/-2/2021;
	    assert(!ymwdl.ok());
	    ymwdl += months(0);	// Normalize month
	    assert(ymwdl.ok());
	}

http://cppreference.com		  2024.06.10	  std::chrono...ay_last::ok(3)

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