std::chrono::year::ok - cppreference.com (original) (raw)

| 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].

[edit] Return value

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

[edit] Possible implementation

See the implementations inlibstdc++,libc++, and Howard Hinnant'sdate.h.

class Year { short year_; // exposition-only   public:   bool ok() const noexcept { return year_ != std::numeric_limits::min(); }   /.../ };

[edit] Example

#include #include #include   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(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