W3cubDocs

/C++

std::chrono::month::ok

constexpr bool ok() const noexcept;

(since C++20)

Checks if the month value stored in *this is in the valid range, i.e., [1, 12].

Return value

true if the month value stored in *this is in the range [1, 12]. Otherwise false.

Example

#include <iostream>
#include <chrono>
 
int main()
{
    for (const unsigned mm : {6u, 0u, 16U}) {
        std::cout << mm << ": ";
        const std::chrono::month m{mm};
        m.ok() ? std::cout << "month is valid\n"
               : std::cout << "month is invalid\n";
    }
}

Output:

6: month is valid
0: month is invalid
16: month is invalid

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/chrono/month/ok