NAME¶

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

Synopsis¶

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

Checks if the year value stored in *this is in the valid range, i.e.,
[-32767, 32767].

Return value¶

true if the year value stored in *this is in the range [-32767, 32767]. Otherwise
false.

Possible implementation¶

See the implementations in libstdc++, libc++, and Howard Hinnant's date.h.

class Year
{
short year_; // exposition-only

public:

bool ok() const noexcept { return year_ != std::numeric_limits<short>::min(); }

/*...*/
};

Example¶

// Run this code

#include <chrono>
#include <iomanip>
#include <iostream>

int main()
{
std::cout << "input year │ internal value │ ok()\n" << std::boolalpha;

for (const int i : {2020, 0x8000, 0x8001, 0xFFFF, 0x18000})
{
const std::chrono::year y{i};
std::cout << std::setw(10) << i << " │ "
<< std::setw(14) << static_cast<int>(y) << " │ "
<< y.ok() << '\n';
}
}

Possible output:¶

input year │ internal value │ ok()
2020 │ 2020 │ true
32768 │ -32768 │ false
32769 │ -32767 │ true
65535 │ -1 │ true
98304 │ -32768 │ false