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std::chrono::month::ok

From cppreference.com
< cpp‎ | chrono‎ | month
 
 
Utilities library
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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].

[edit] Return value

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

[edit] 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