NAME¶

std::chrono::year::year - std::chrono::year::year

Synopsis¶

year() = default; (1) (since C++20)
constexpr explicit year( int y ) noexcept; (2) (since C++20)

Constructs a year object.

1) Default constructor leaves the year value uninitialized.
2) If y is in the range [-32767, 32767], constructs a year object holding the year
value y. Otherwise the value held is unspecified.

Example¶

// Run this code

#include <chrono>
#include <iostream>

int main()
{
using namespace std::chrono;

constexpr int leap_years = []
{
int count{};
for (int i{year::min()}; i <= int{year::max()}; ++i)
if (year{i}.is_leap()) // uses constructor (2)
++count;
return count;
} ();

static_assert(15891 == leap_years);

std::cout << "There are " << leap_years << " leap years in the range ["
<< int(year::min()) << ", " << int(year::max()) << "].\n";
}

Output:¶

There are 15891 leap years in the range [-32767, 32767].