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

NAME
     std::chrono::weekday::ok - std::chrono::weekday::ok

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

	Checks if the weekday value stored in *this is in the valid range, i.e.,
     [0, 6].

Return value
	true if the weekday value stored in *this is in the range [0, 6]. Other-
     wise false.

Example
     // Run this code

      #include <chrono>
      #include <iomanip>
      #include <iostream>
      #include <locale>
      #include <string>

      struct weekday_ok : std::numpunct<char>
      {
	  std::string  do_truename()   const override { return " (is valid week-
     day)"; }
	  std::string do_falsename() const override { return  "  (is  not  valid
     weekday)"; }
      };

      int main()
      {
	  std::cout.imbue(std::locale(std::cout.getloc(), new weekday_ok));
	  std::cout << std::boolalpha;

	  for  (const unsigned u : {0 /* Sun */, 1 /* Mon */, 6, 7 /* Sun */, 8,
     9})
	  {
	      const std::chrono::weekday wd{u};
	      std::cout << "u: " << u << "; wd: " << wd.c_encoding() <<  wd.ok()
     << '\n';
	  }
      }

Output:
      u: 0; wd: 0 (is valid weekday)
      u: 1; wd: 1 (is valid weekday)
      u: 6; wd: 6 (is valid weekday)
      u: 7; wd: 0 (is valid weekday)
      u: 8; wd: 8 (is not valid weekday)
      u: 9; wd: 9 (is not valid weekday)

See also
	c_encoding   retrieves the stored weekday value
	iso_encoding retrieves ISO 8601 weekday value
		     (public member function)

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