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std::chrono::duration

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std::chrono::duration
Member-Funktionen
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Member functions
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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-Funktionen
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Non-member functions
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common_type
operator+
operator-
operator*
operator/
operator%
operator==
operator!=
operator<
operator<=
operator>
operator>=
duration_cast
Helper-Klassen
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Helper classes
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treat_as_floating_point
duration_values
 
Defined in header <chrono>
template<

    class Rep,
    class Period = std::ratio<1>

> class duration;
(seit C++11)

Class template std::chrono::duration represents a time interval.

It consists of a count of ticks of type Rep and a tick period, where the tick period is a compile-time rational constant representing the number of seconds from one tick to the next.

The only data stored in a duration is a tick count of type Rep. If Rep is floating point, then the duration can represent fractions of ticks. Period is included as part of the duration's type, and is only used when converting between different durations.

Inhaltsverzeichnis

[Bearbeiten] Mitglied Typen

Mitglied Typ
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Member type
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Definition
rep Rep, an arithmetic type representing the number of ticks
period Period, a std::ratio representing the tick period (i.e. the number of seconds per tick)

[Bearbeiten] Member-Funktionen

baut neue Dauer
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constructs new duration
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(öffentliche Elementfunktion) [edit]
ordnet die Inhalte
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assigns the contents
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(öffentliche Elementfunktion) [edit]
gibt die Anzahl der Zecken
Original:
returns the count of ticks
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(öffentliche Elementfunktion) [edit]
[statisch]
returns the special duration value zero
(public static Elementfunktion) [edit]
[statisch]
gibt den besonderen Wert für die Dauer min
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returns the special duration value min
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(public static Elementfunktion) [edit]
[statisch]
gibt den besonderen Wert für die Dauer max
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returns the special duration value max
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(public static Elementfunktion) [edit]
implementiert unäre + und unäre -.
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implements unary + and unary -
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(öffentliche Elementfunktion) [edit]
erhöht oder verringert die Anzahl der Ticks
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increments or decrements the tick count
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(öffentliche Elementfunktion) [edit]
implementiert Verbindung Zuordnung zwischen zwei Laufzeiten
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implements compound assignment between two durations
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(öffentliche Elementfunktion) [edit]

[Bearbeiten] Non-member types

Type
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Type
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Definition
std::chrono::nanoseconds duration type with Period std::nano
std::chrono::microseconds duration type with Period std::micro
std::chrono::milliseconds duration type with Period std::milli
std::chrono::seconds duration type with Period std::ratio<1>
std::chrono::minutes duration type with Period std::ratio<60>
std::chrono::hours duration type with Period std::ratio<3600>

[Bearbeiten] Non-Member-Funktionen

spezialisiert die std::common_type Merkmal
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specializes the std::common_type trait
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(class Template-Spezialisierung) [edit]
implementiert arithmetische Operationen mit Laufzeiten als Argumente
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implements arithmetic operations with durations as arguments
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(Funktions-Template) [edit]
vergleicht zwei Laufzeiten
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compares two durations
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(Funktions-Template) [edit]
wandelt eine Dauer zu einer anderen, mit einem anderen Tickintervall
Original:
converts a duration to another, with a different tick interval
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(Funktions-Template) [edit]

[Bearbeiten] Helper-Klassen

indicates that a duration is convertible to duration with different tick period
(Klassen-Template)
constructs zero, min, and max values of a tick count of given type
(Klassen-Template)

[Bearbeiten] Beispiel

This example shows how to define several custom duration types and convert between types:

#include <iostream>
#include <chrono>
 
int main()
{
    typedef std::chrono::duration<int, std::ratio<1, 100000000>> shakes;
    typedef std::chrono::duration<int, std::centi> jiffies;
    typedef std::chrono::duration<float, std::ratio<12096,10000>> microfortnights;
    typedef std::chrono::duration<float, std::ratio<3155,1000>> nanocenturies;
 
    std::chrono::seconds sec(1);
 
    std::cout << "1 second is:\n";
 
    std::cout << std::chrono::duration_cast<shakes>(sec).count()
              << " shakes\n";
    std::cout << std::chrono::duration_cast<jiffies>(sec).count()
              << " jiffies\n";
    std::cout << std::chrono::duration_cast<microfortnights>(sec).count()
              << " microfortnights\n";
    std::cout << std::chrono::duration_cast<nanocenturies>(sec).count()
              << " nanocenturies\n";
}

Output:

1 second is:
100000000 shakes
100 jiffies
0.82672 microfortnights
0.316957 nanocenturies