std::flush
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<tbody> </tbody>| definiert in Header <ostream>
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template< class CharT, class Traits > std::basic_ostream<charT,traits>& flush( std::basic_ostream<CharT, Traits>& os ); |
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Spült die Ausgangsfolge
os, als ob durch den Aufruf os.flush() . Original:
Flushes the output sequence
os as if by calling os.flush(). The text has been machine-translated via Google Translate.
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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.The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
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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(). The text has been machine-translated via Google Translate.
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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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Parameter
| os | - | Verweis auf Ausgabe-Stream
Original: reference to output stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Rückgabewert
os (Verweis auf den Stream nach Manipulation)Original:
os (reference to the stream after manipulation)The text has been machine-translated via Google Translate.
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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.
The text has been machine-translated via Google Translate.
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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)..
Siehe auch
Kontrollen, ob die Ausgabe nach jeder Operation wird gespült Original: controls whether output is flushed after each operation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) | |
Ausgänge '\n' und spült den Ausgabe-StreamOriginal: outputs '\n' and flushes the output streamThe text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template) | |
synchronisiert mit dem zugrunde liegenden Speicher Original: synchronizes with the underlying storage device The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of std::basic_ostream)
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