Date and time utilities

 

C++

Idioma

Conceptos

Utilidades de la biblioteca

Strings biblioteca

Contenedores biblioteca

Algoritmos biblioteca

Los iteradores biblioteca

Numéricos biblioteca

Entrada / salida de la biblioteca

Localizaciones biblioteca

Expresiones biblioteca Regular (C++11)

Operaciones de biblioteca Atómica (C++11)

Tema Biblioteca de ayuda (C++11)

 

Utilidades de la biblioteca

Escriba apoyo (basic types, RTTI, type traits)

Gestión de memoria dinámica

Gestión de errores

Programa de servicios públicos

Funciones variadic

Fecha y hora

Objetos Function

initializer_list (C++11)

bitset

hash (C++11)

Operadores relacionales Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Pares y tuplas Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Cambiar, hacia adelante y mover Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

Fecha y hora de los servicios públicos

time_point (C++11)

duration (C++11)

system_clock (C++11)

steady_clock (C++11)

high_resolution_clock (C++11)

C-estilo de fecha y hora

 

C + + incluye soporte para dos tipos de manipulación del tiempo:

Original:

C++ includes support for two types of time manipulation:

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• La biblioteca chrono, una colección flexible de tipos que rastrean tiempo con diferentes grados de precisión (por ejemplo std::chrono::time_point) .

  Original:

  The chrono library, a flexible collection of types that track time with varying degrees of precision (e.g. std::chrono::time_point).

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• C-estilo biblioteca de fecha y hora (por ejemplo std::time)

  Original:

  C-style date and time library (e.g. std::time)

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NJ biblioteca

La biblioteca chrono define tres tipos principales (duraciones, relojes, y los puntos de tiempo), así como funciones de utilidad y typedefs comunes .

Original:

The chrono library defines three main types (durations, clocks, and time points) as well as utility functions and common typedefs.

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Duración

Una duración consta de un lapso de tiempo, que se define como un número de garrapatas de alguna otra unidad de tiempo. Por ejemplo, "42 segundos" puede ser representado por una duración que consiste de 42 garrapatas de una unidad de tiempo 1-segundos .

Original:

A duration consists of a span of time, defined as some number of ticks of some time unit. For example, "42 seconds" could be represented by a duration consisting of 42 ticks of a 1-second time unit.

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Defined in header <chrono>
Defined in namespace std::chrono
duration (C++11)	un intervalo de tiempo Original: a time interval The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (clase de plantilla)

Relojes

Un reloj consta de un punto de partida (o época) y una tasa de garrapata. Por ejemplo, un reloj puede tener una época del 1 de enero de 1970 y marque cada segundo. C + + define tres tipos de reloj:

Original:

A clock consists of a starting point (or epoch) and a tick rate. For example, a clock may have an epoch of January 1, 1970 and tick every second. C++ defines three clock types:

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Defined in header <chrono>
Defined in namespace std::chrono
system_clock (C++11)	pared tiempo reloj desde el reloj en tiempo real de todo el sistema Original: wall clock time from the system-wide realtime clock The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (clase)
steady_clock (C++11)	reloj monotónico que nunca va a ser ajustado Original: monotonic clock that will never be adjusted The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (clase)
high_resolution_clock (C++11)	el reloj con el período más corto garrapata disponible Original: the clock with the shortest tick period available The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (clase)

Hora punto

Un punto de tiempo es un periodo de tiempo que ha pasado desde la época de reloj específico .

Original:

A time point is a duration of time that has passed since the epoch of specific clock.

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Defined in header <chrono>
Defined in namespace std::chrono
time_point (C++11)	a point in time (clase de plantilla)

C-estilo de la fecha y la biblioteca de tiempo

También se proporcionan las funciones de lenguaje C de fecha y hora, como std::time_t, std::difftime y CLOCKS_PER_SEC .

Original:

Also provided are the C-style date and time functions, such as std::time_t, std::difftime, and CLOCKS_PER_SEC.

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Ejemplo

En este ejemplo se muestra información sobre el tiempo de ejecución de una llamada a la función:

Original:

This example displays information about the execution time of a function call:

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#include <iostream>
#include <chrono>
#include <ctime>
 
int fibonacci(int n)
{
    if (n < 3) return 1;
    return fibonacci(n-1) + fibonacci(n-2);
}
 
int main()
{
    std::chrono::time_point<std::chrono::system_clock> start, end;
    start = std::chrono::system_clock::now();
    int result = fibonacci(42);
    end = std::chrono::system_clock::now();
 
    int elapsed_seconds = std::chrono::duration_cast<std::chrono::seconds>
                             (end-start).count();
    std::time_t end_time = std::chrono::system_clock::to_time_t(end);
 
    std::cout << "finished computation at " << std::ctime(&end_time)
              << "elapsed time: " << elapsed_seconds << "s\n";
}

Possible output:

finished computation at Sat Jun 16 20:42:57 2012
elapsed time: 3s