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std::flush

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< cpp‎ | io‎ | manip

 
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
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Streams
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Abstraktionen
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-I / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
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Array I/O
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istrstream(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
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Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
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Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Eingang / Ausgang Manipulatoren
Gleitkomma-Formatierung
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Floating-point formatting
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Integer-Formatierung
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Integer formatting
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Boolean Formatierung
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Boolean formatting
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boolalpha
noboolalpha
Feldbreite und fill Kontrolle
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Field width and fill control
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Andere Formatierungen
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Other formatting
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Whitespace-Verarbeitung
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Whitespace processing
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Output Spülung
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Output flushing
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flush
endl
Statusflags Manipulation
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Status flags manipulation
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Zeit und Geld 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 );
Spült die Ausgangsfolge os, als ob durch den Aufruf os.flush() .
Original:
Flushes the output sequence os as if by calling os.flush().
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Dies ist ein Nur-Ausgabe-I / O-Manipulators, kann es mit einem Expressionsvektor wie out << std::flush für jede out vom Typ std::basic_ostream aufgerufen werden .
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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Inhaltsverzeichnis

[Bearbeiten] Notes

Dieser Manipulator kann verwendet werden, um eine unvollständige Zeile der Ausgabe sofort produzieren werden, zB bei der Anzeige Ausgang eines lang andauernden Prozesses, Logging-Aktivität von mehreren Threads oder Protokollierung Aktivität eines Programms, das unerwartet abstürzen kann. Eine explizite Flush von std::cout ist auch vor einem Aufruf von std::system erforderlich, wenn die erzeugten Prozess führt alle Bildschirm-I / O (Ein gängiges Beispiel ist std::system("pause") unter Windows). In den meisten anderen üblichen interaktiven I / O Szenarien ist std::endl überflüssig, wenn mit std::cout verwendet, da jeder Eingang von std::cin, Ausgabe auf std::cerr oder Beendigung des Programms zwingt einen Anruf an 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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Wenn eine komplette Zeile der Ausgabe gespült werden muss, kann die std::endl Manipulators verwendet werden .
Original:
When a complete line of output needs to be flushed, the std::endl manipulator may be used.
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Wenn jede Ausgabe-Operation gespült werden muss, kann die std::unitbuf Manipulators verwendet werden .
Original:
When every output operation needs to be flushed, the std::unitbuf manipulator may be used.
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[Bearbeiten] Parameter

os -
Verweis auf Ausgabe-Stream
Original:
reference to output stream
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[Bearbeiten] Rückgabewert

os (Verweis auf den Stream nach Manipulation)
Original:
os (reference to the stream after manipulation)
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[Bearbeiten] Beispiel

Ohne std :: flush, würde die Ausgabe identisch sein, kann aber nicht in Echtzeit angezeigt .
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';
}

Output:

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

[Bearbeiten] Siehe auch

Kontrollen, ob die Ausgabe nach jeder Operation wird gespült
Original:
controls whether output is flushed after each operation
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(Funktion) [edit]
Ausgänge '\n' und spült den Ausgabe-Stream
Original:
outputs '\n' and flushes the output stream
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(Funktions-Template) [edit]
synchronisiert mit dem zugrunde liegenden Speicher
Original:
synchronizes with the underlying storage device
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(öffentliche Elementfunktion of std::basic_ostream) [edit]