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 <chrono> #include <iomanip> #include <iostream> int main() { std::cout << "input year a internal value a 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 << " a " << std::setw(14) << static_cast<int>(y) << " a " << y.ok() << '\n'; } } Possible output: input year a internal value a ok() 2020 a 2020 a true 32768 a -32768 a false 32769 a -32767 a true 65535 a -1 a true 98304 a -32768 a false http://cppreference.com 2024.06.10 std::chrono::year::ok(3)
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