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std::chrono::month_day::ok

From cppreference.com
< cpp‎ | chrono‎ | month day
 
 
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constexpr bool ok() const noexcept;
(since C++20)

Determines whether this month_day stores a valid month-day combination.

The combination is valid if month() represents a valid month (month().ok() == true), unsigned{day()} >= 1, and unsigned{day()} <= D, where D is the number of days in the month represented by month(). The number of days in February is considered to be 29.

[edit] Return value

true if the month and day combination is valid, otherwise false.

[edit] Example

#include <iostream>
#include <chrono>
 
int main()
{
    std::cout << std::boolalpha;
 
    constexpr auto md1 {std::chrono::July/15};
    std::cout << (md1.ok()) << ' ';
    constexpr std::chrono::month_day md2 {std::chrono::month(14), std::chrono::day(42)};
    std::cout << (md2.ok()) << ' ';
    constexpr auto md3 {std::chrono::February/29};
    std::cout << (md3.ok()) << '\n';
}

Output:

true false true