std::flush
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| 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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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[Bearbeiten] 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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[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 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-Stream Original: outputs '\n' and flushes the output stream The 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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