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std::chrono::year::ok(3) C++ Standard Libary std::chrono::year::ok(3) 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_lim- its<short>::min(); } /*...*/ }; Example // Run this code #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) << sta- tic_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 http://cppreference.com 2022.07.31 std::chrono::year::ok(3)
NAME | Synopsis | Return value | Possible implementation | Example | Possible output:
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