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std::endl

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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
Original:
Streams
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Abstraktionen
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
Original:
Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Eingang / Ausgang Manipulatoren
Gleitkomma-Formatierung
Original:
Floating-point formatting
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Integer-Formatierung
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Integer formatting
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Boolean Formatierung
Original:
Boolean formatting
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boolalpha
noboolalpha
Feldbreite und fill Kontrolle
Original:
Field width and fill control
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Andere Formatierungen
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Other formatting
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Whitespace-Verarbeitung
Original:
Whitespace processing
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Output Spülung
Original:
Output flushing
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flush
endl
Statusflags Manipulation
Original:
Status flags manipulation
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Zeit und Geld I / O
Original:
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>& endl( std::basic_ostream<CharT, Traits>& os );
Fügt eine endline Zeichen in der Ausgangsfolge os und spült es, als ob durch den Aufruf os.put(os.widen('\n')) durch os.flush() gefolgt .
Original:
Inserts a endline character into the output sequence os and flushes it as if by calling os.put(os.widen('\n')) followed by os.flush().
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Dies ist ein Nur-Ausgabe-I / O-Manipulators, kann es mit einem Expressionsvektor wie out << std::endl 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::endl for any out of type std::basic_ostream.
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Inhaltsverzeichnis

[Bearbeiten] Notes

Dieser Manipulator verwendet werden, um eine Linie von Ausgang sofort 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(). Verwendung std::endl statt '\n', von einigen Quellen gefördert werden, erheblich verschlechtern Ausgangsleistung .
Original:
This manipulator may be used to produce a 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(). Use of std::endl in place of '\n', encouraged by some sources, may significantly degrade output performance.
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In vielen Implementierungen ist die Standardausgabe line-gepuffert und schriftlich '\n' verursacht einen Flush sowieso, es sei denn, std::cout.sync_with_stdio(false) ausgeführt wurde. In solchen Situationen unnötige endl nur verschlechtert die Leistung der Datei-Ausgabe, nicht Standard-Ausgabe .
Original:
In many implementations, standard output is line-buffered, and writing '\n' causes a flush anyway, unless std::cout.sync_with_stdio(false) was executed. In those situations, unnecessary endl only degrades the performance of file output, not standard output.
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Die Codebeispiele in diesem Wiki follow Bjarne Stroustrup in Spülen der Standard-Ausgabe nur wo nötig .
Original:
The code samples on this wiki follow Bjarne Stroustrup in flushing the standard output only where necessary.
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Wenn eine unvollständige Zeile der Ausgabe gespült werden muss, kann die std::flush Manipulators verwendet werden .
Original:
When an incomplete line of output needs to be flushed, the std::flush manipulator may be used.
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Wenn jedes Zeichen des Ausgangs gespült werden muss, kann die std::unitbuf Manipulators verwendet werden .
Original:
When every character of output 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

Mit \ n statt endl, würde die Ausgabe identisch sein, kann aber nicht in Echtzeit angezeigt .
Original:
With \n instead of endl, 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 passed" << std::endl;
}
int main()
{
    std::cout.sync_with_stdio(false); // on some platforms, stdout flushes on \n
    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);
    }
}

Output:

487 ms passed
974 ms passed
1470 ms passed
1965 ms passed
2455 ms passed

[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]
spült die Ausgabe-Stream
Original:
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]