W3cubDocs

/C++

std::chrono::weekday::ok

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]. Otherwise false.

Example

#include <iostream>
#include <chrono>
 
int main()
{
    for (const unsigned u : {0, 1, 6, 7, 8, 9}) {
        const std::chrono::weekday wd{u};
        std::cout 
            << "u = " << u << ", wd = "
            << wd.c_encoding() // Monday is 1
            << (wd.ok() ? " is a valid weekday.\n"
                        : " is an invalid weekday!\n");
    }
}

Output:

u = 0, wd = 0 is a valid weekday.
u = 1, wd = 1 is a valid weekday.
u = 6, wd = 6 is a valid weekday.
u = 7, wd = 0 is a valid weekday.
u = 8, wd = 8 is an invalid weekday!
u = 9, wd = 9 is an invalid weekday!

std::chrono::weekday::ok

Return value

Example

See also