Namespace
Varianti

std::difftime

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< cpp‎ | chrono‎ | c

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C++
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
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Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
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Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
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Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Data e ora utilità
 
C-stile di data e ora utilità
Funzioni
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Functions
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Tempo di manipolazione
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Time manipulation
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difftime
time
clock
Formato conversioni
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Format conversions
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asctime
ctime
strftime
wcsftime
gmtime
localtime
mktime
Costanti
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Constants
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CLOCKS_PER_SEC
Tipi
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Types
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tm
time_t
clock_t
 
Elemento definito nell'header <ctime>
double difftime( time_t time2, time_t time1 );
Calcola differenza tra due orari di calendario come oggetti time_t (time2 - time1) in pochi secondi.
Original:
Computes difference between two calendar times as time_t objects (time2 - time1) in seconds.
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Indice

[modifica] Parametri

time1, time2 -
volte da confrontare
Original:
times to compare
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[modifica] Valore di ritorno

Differenza tra due volte in pochi secondi
Original:
Difference between two times in seconds
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[modifica] Esempio

#include <iostream>
#include <ctime>
int main()
{
    std::time_t start = std::time(NULL);
    volatile double d;
    for(int n=0; n<10000; ++n)
       for(int m=0; m<100000; ++m)
           d += d*n*m; // some time-consuming operation
    std::cout << "Wall time passed: "
              << std::difftime(std::time(NULL), start) << " s.\n";
}

Output: 

Wall time passed: 7 s.

[modifica] Vedi anche

(C++11)
un intervallo di tempo
Original:
a time interval
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(classe template) [modifica]
C documentation for difftime
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/chrono/c/difftime&oldid=25050"