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std::flush

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< cpp‎ | io‎ | manip

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
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Streams
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Abstractions
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
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Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
Original:
Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
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Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
D'entrée / sortie manipulateurs
À virgule flottante en forme
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Floating-point formatting
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Formatage entier
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Integer formatting
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Formatage booléen
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Boolean formatting
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boolalpha
noboolalpha
Largeur de champ et de contrôle de remplissage
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Field width and fill control
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Autre mise en forme
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Other formatting
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Traitement des espaces blancs
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Whitespace processing
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Sortie de rinçage
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Output flushing
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flush
endl
Indicateurs d'état manipulation
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Status flags manipulation
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Temps et d'argent I / O
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Time and money I/O
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get_money (C++11)
get_time (C++11)
put_money (C++11)
put_time (C++11)
 
Defined in header <ostream>
template< class CharT, class Traits >
std::basic_ostream<charT,traits>& flush( std::basic_ostream<CharT, Traits>& os );
Vide la séquence de sortie os comme si en appelant os.flush() .
Original:
Flushes the output sequence os as if by calling os.flush().
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Il s'agit d'un manipulateur de sortie uniquement d'E / S, il peut être appelé avec une expression telle que pour tout out << std::flush out de std::basic_ostream type .
Original:
This is an output-only I/O manipulator, it may be called with an expression such as out << std::flush for any out of type std::basic_ostream.
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Sommaire

[modifier] Notes

Ce manipulateur peut être utilisé pour produire une ligne incomplète de sortie immédiatement, par exemple lors de l'affichage de sortie d'un processus de longue durée, l'activité forestière de plusieurs threads ou journalisation de l'activité d'un programme qui peut se bloquer de façon inattendue. Un rinçage explicite de std::cout est également nécessaire avant un appel à std::system, si le processus a engendré exécute n'importe quel écran I / O (un exemple courant est std::system("pause") sous Windows). Dans la plupart des autres habituels entrée / sortie interactive scénarios, std::endl est redondante lorsqu'il est utilisé avec std::cout car toute entrée de std::cin, sortie à std::cerr, ou la fin du programme oblige un appel à std::cout.flush() .
Original:
This manipulator may be used to produce an incomplete line of output immediately, e.g. when displaying output from a long-running process, logging activity of multiple threads or logging activity of a program that may crash unexpectedly. An explicit flush of std::cout is also necessary before a call to std::system, if the spawned process performs any screen I/O (a common example is std::system("pause") on Windows). In most other usual interactive I/O scenarios, std::endl is redundant when used with std::cout because any input from std::cin, output to std::cerr, or program termination forces a call to std::cout.flush().
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Quand une ligne complète de production doit être rincé, le manipulateur std::endl peut être utilisé .
Original:
When a complete line of output needs to be flushed, the std::endl manipulator may be used.
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Lorsque chaque opération de sortie doit être balayé, le manipulateur peut être utilisé std::unitbuf .
Original:
When every output operation needs to be flushed, the std::unitbuf manipulator may be used.
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[modifier] Paramètres

os -
référence aux flux de sortie
Original:
reference to output stream
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[modifier] Retourne la valeur

os (référence au flux après la manipulation)
Original:
os (reference to the stream after manipulation)
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[modifier] Exemple

Sans std :: flush, la sortie serait le même, mais peut ne pas apparaître en temps réel .
Original:
Without std::flush, the output would be the same, but may not appear in real time.
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#include <iostream>
#include <chrono>
template<typename Diff>
void log_progress(Diff d)
{
    std::cout << "..("
              << std::chrono::duration_cast<std::chrono::milliseconds>(d).count()
              << " ms).." << std::flush;
}
int main()
{
    volatile int sink=0;
 
    auto t1 = std::chrono::high_resolution_clock::now();
    for(int j=0; j<5; ++j)
    {
        for(int n=0; n<10000; ++n)
            for(int m=0; m<20000; ++m)
                sink += m*n; // do some work
        auto now = std::chrono::high_resolution_clock::now();
        log_progress(now - t1);
    }
    std::cout << '\n';
}

Résultat :

..(450 ms)....(901 ms)....(1350 ms)....(1800 ms)....(2250 ms)..

[modifier] Voir aussi

contrôle si la sortie est vidé après chaque opération
Original:
controls whether output is flushed after each operation
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(fonction) [edit]
sorties '\n' et vide le flux de sortie
Original:
outputs '\n' and flushes the output stream
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(fonction générique) [edit]
synchronise avec le dispositif de stockage sous-jacent
Original:
synchronizes with the underlying storage device
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(fonction membre publique de std::basic_ostream) [edit]