std::chrono::year::is_leap
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Date and time library
(C++11)
(C++20)
(C++20)
(C++11)
(C++11)
(C++11)
(C++20)
(C++20)
(C++20)
(C++11)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
std::chrono::year
Member functions
year::is_leap
Nonmember functions
Helper classes
(C++26)
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
- is divisible by 4 and not divisible by 100; or
- is divisible by 400.
[edit] Return value
true if *this represents a leap year, otherwise false.
[edit] Example
Run this code
#include <chrono> #include <iostream> 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