std::chrono::year::ok
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
#include <iostream>
#include <iomanip>
#include <chrono>
int main()
{
for (const int i : {2020, 0x8000, 0x8001, 0xFFFF, 0x18000}) {
const std::chrono::year y{i};
std::cout << std::boolalpha
<< "input year: " << std::setw(6) << i
<< " │ internal value: " << std::setw(7) << static_cast<int>(y)
<< " │ ok(): " << y.ok() << '\n';
}
}
Possible output:
input year: 2020 │ internal value: 2020 │ ok(): true input year: 32768 │ internal value: -32768 │ ok(): false input year: 32769 │ internal value: -32767 │ ok(): true input year: 65535 │ internal value: -1 │ ok(): true input year: 98304 │ internal value: -32768 │ ok(): false
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