NAME

std::chrono::day::ok - std::chrono::day::ok

Synopsis

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

Checks if the day value stored in *this is in the valid range, i.e., [1, 31].

Return value

true if the day value stored in *this is in the range [1, 31]. Otherwise false.

Example

// Run this code

#include <iostream>
#include <chrono>

int main()
{
std::chrono::day d1{15};
std::cout << static_cast<unsigned>(d1);
if (d1.ok()) {
std::cout << " is a valid day.\n";
} else {
std::cout << " is an invalid day!\n";
}

std::chrono::day d2{35};
std::cout << static_cast<unsigned>(d2)
<< (d2.ok() ? " is a valid day.\n"
: " is an invalid day!\n");
}

Output:

15 is a valid day.
35 is an invalid day!

See also

operator unsigned retrieves the stored day value
(public member function)