std::chrono::duration
Da cppreference.com
 |
This page has been machine-translated from the English version of the wiki using Google Translate.
The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here. |
| Definido no cabeçalho <chrono>
|
||
| template< class Rep, |
(desde 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.
Índice |
[editar] Tipos de membro
| Tipo de membro
Original: Member type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
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)
|
[editar] Funções de membro
| constrói nova duração Original: constructs new duration The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
| atribui o conteúdo Original: assigns the contents The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
| retorna a contagem de carrapatos Original: returns the count of ticks The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
| [estática] |
returns the special duration value zero (função public static membro) |
| [estática] |
retorna o valor especial min de duração Original: returns the special duration value min The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função public static membro) |
| [estática] |
retorna o valor máximo especial duração Original: returns the special duration value max The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função public static membro) |
| implementa + unário e - unário Original: implements unary + and unary - The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
| aumenta ou diminui a contagem em escala Original: increments or decrements the tick count The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
| implementa atribuição composto entre duas durações Original: implements compound assignment between two durations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (função pública membro) | |
[editar] Non-member types
| Tipo
Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
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> |
[editar] Não-membros funções
| especializa o traço std::common_type Original: specializes the std::common_type trait The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (especialização modelo. classe) | |
| implementa operações aritméticas com durações como argumentos Original: implements arithmetic operations with durations as arguments The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) | |
| compara duas durações Original: compares two durations The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) | |
| converte a duração para o outro, com um intervalo de carraça diferentes Original: converts a duration to another, with a different tick interval The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (modelo de função) | |
[editar] Classes auxiliares
| indicates that a duration is convertible to duration with different tick period (modelo de classe) | |
| constructs zero, min, and max values of a tick count of given type (modelo de classe) | |
[editar] Exemplo
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"; }
Saída:
1 second is: 100000000 shakes 100 jiffies 0.82672 microfortnights 0.316957 nanocenturies
