std::chrono::duration<Rep,Period>::max

 

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Date and time library

Time point time_point (C++11) clock_time_conversion (C++20)   clock_cast (C++20) Duration duration (C++11) Clocks system_clock (C++11) steady_clock (C++11) is_clock (C++20) utc_clock (C++20) tai_clock (C++20) high_resolution_clock (C++11) gps_clock (C++20) file_clock (C++20) local_t (C++20) Time of day is_amis_pm (C++20)(C++20) make12make24 (C++20)(C++20) hh_mm_ss (C++20)

Calendar day (C++20) month (C++20) year (C++20) weekday (C++20) operator/ (C++20) year_month_day (C++20) year_month_day_last (C++20) year_month_weekday (C++20) year_month_weekday_last (C++20)   weekday_indexed (C++20) weekday_last (C++20) month_day (C++20) month_day_last (C++20) month_weekday (C++20) month_weekday_last (C++20) year_month (C++20) last_speclast (C++20)(C++20) chrono I/O parse (C++20)

Time zone tzdb (C++20) tzdb_list (C++20) get_tzdbget_tzdb_listreload_tzdbremote_version (C++20)(C++20)(C++20)(C++20) sys_info (C++20) local_info (C++20) nonexistent_local_time (C++20) ambiguous_local_time (C++20) locate_zone (C++20) current_zone (C++20) time_zone (C++20) choose (C++20) zoned_traits (C++20) zoned_time (C++20) time_zone_link (C++20) leap_second (C++20) leap_second_info (C++20) get_leap_second_info (C++20) C-style date and time

 

std::chrono::duration

Member functions
duration::duration duration::operator= duration::count duration::zero duration::min duration::max duration::operator+duration::operator-	duration::operator++duration::operator-- duration::operator+=duration::operator-=duration::operator*=duration::operator/=duration::operator%=
Non-member functions
operator+operator-operator*operator/operator% operator==operator!=operator<operator<=operator>operator>=operator<=> (until C++20)(C++20) operator<< (C++20)	duration_cast floor (C++17) ceil (C++17) round (C++17) abs (C++17) operator""h (C++14) operator""min (C++14) operator""s (C++14) operator""ms (C++14) operator""us (C++14) operator""ns (C++14) from_stream (C++20)
Helper classes
common_type treat_as_floating_point      duration_values	formatter<std::chrono::duration> (C++20) hash<std::chrono::duration> (C++26)

 

staticconstexpr duration max();		(until C++20)
staticconstexpr duration max()noexcept;		(since C++20)

Returns a duration with the largest possible value.

If the representation rep of the duration requires some other implementation to return a maximum-length duration, std::chrono::duration_values can be specialized to return the desired value.

Parameters

(none)

Return value

duration(std::chrono::duration_values<rep>::max())

Example

Run this code

#include <chrono>#include <cstdint>#include <iomanip>#include <iostream>   int main(){constexpr uint64_t chrono_years_max = std::chrono::years::max().count();constexpr uint64_t chrono_seconds_max = std::chrono::seconds::max().count();   constexpr uint64_t age_of_universe_in_years{13'787'000'000}; // Λ-CDM ≈ k₁/H₀ = k₂/42 constexpr uint64_t seconds_per_year{365'25*24*36};// 365¼ × 24 × 60 × 60constexpr uint64_t age_of_universe_in_seconds{age_of_universe_in_years * seconds_per_year};std::cout<<std::scientific<<std::setprecision(2)<<"The Age of the Universe is ≈ "<<static_cast<double>(age_of_universe_in_years)<<" years or "<<static_cast<double>(age_of_universe_in_seconds)<<" seconds.\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::seconds "<<(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 [static]	returns the special duration value zero (public static member function)
min [static]	returns the special duration value min (public static member function)