std::chrono::year::ok
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std::chrono::year
Member functions
year::ok
Nonmember functions
Helper classes
(C++26)
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 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(); } /*...*/ };
[edit] 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