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std::chrono::duration::max(3) C++ Standard Libarystd::chrono::duration::max(3) NAME std::chrono::duration::max - std::chrono::duration::max Synopsis static constexpr duration max(); (until C++20) static constexpr duration max() noexcept; (since C++20) Returns a duration with the largest possible value. If the representation rep of the duration requires some other imple- mentation to return a maximum-length duration, std::chrono::duration_values can be specialized to return the desired value. Parameters (none) Return value returns duration(std::chrono::duration_values<rep>::max()) Example // Run this code #include <chrono> #include <iostream> #include <iomanip> #include <cstdint> int main() { constexpr uint64_t chrono_years_max = std::chrono::years::max().count(); constexpr uint64_t chrono_seconds_max = std::chrono::sec- onds::max().count(); constexpr uint64_t age_of_universe_in_years{13'787'000'000}; //: CDM k/H = k/42. constexpr uint64_t seconds_per_year{365'25 * 24 * 36}; // 365 24 60 60 constexpr uint64_t age_of_universe_in_seconds{age_of_uni- verse_in_years * seconds_per_year}; std::cout << "The Age of the Universe is " << std::scientific << std::setprecision(2) << static_cast<double>(age_of_universe_in_years) << " years or " << static_cast<double>(age_of_universe_in_seconds) << " sec- onds.\n\n" << "chrono::years::max() = " << chrono_years_max << ", sizeof(chrono::years) = " << sizeof(std::chrono::years) << " bytes.\n" "chrono::years " << (age_of_universe_in_years <= chrono_years_max ? "CAN" : "CANNOT") << " keep the Age of the Universe in YEARS.\n\n" << "chrono::seconds::max() = " << chrono_seconds_max << ", sizeof(chrono::seconds) = " << sizeof(std::chrono::seconds) << " bytes.\n" "chrono::sec- onds " << (age_of_universe_in_seconds <= chrono_seconds_max ? "CAN" : "CANNOT") << " keep the Age of the Universe in SECONDS.\n"; } Possible output: The Age of the Universe is 1.38e+10 years or 4.35e+17 seconds. chrono::years::max() = 2147483647, sizeof(chrono::years) = 4 bytes. chrono::years CANNOT keep the Age of the Universe in YEARS. chrono::seconds::max() = 9223372036854775807, sizeof(chrono::seconds) = 8 bytes. chrono::seconds CAN keep the Age of the Universe in SECONDS. See also zero returns the special duration value zero [static] (public static member function) min returns the special duration value min [static] (public static member function) http://cppreference.com 2022.07.31 std::chrono::duration::max(3)
NAME | Synopsis | Parameters | Return value | Example | Possible output: | See also
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