constexpr bool is_leap() const noexcept; | (since C++20) |
Determines if *this represents a leap year in the proleptic Gregorian calendar.
*this represents a leap year if the stored year value.
true if *this represents a leap year, otherwise false.
#include <iostream>
#include <chrono>
int main()
{
using namespace std::chrono_literals;
for (const std::chrono::year y : {2020y, 2021y, 2000y, 3000y}) {
if (const int iy{ static_cast<int>(y) }; y.is_leap()) {
std::cout << iy << " is a leap year because it is divisible by "
<< (iy % 400 == 0 ? "400\n" : "4 and not divisible by 100\n");
} else {
std::cout << iy << " is not a leap year\n";
}
}
}Output:
2020 is a leap year because it is divisible by 4 and not divisible by 100 2021 is not a leap year 2000 is a leap year because it is divisible by 400 3000 is not a leap year
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