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std::unitbuf, std::nounitbuf

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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
Original:
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
Original:
Other formatting
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Whitespace-Verarbeitung
Original:
Whitespace processing
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Output Spülung
Original:
Output flushing
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unitbuf
nounitbuf
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 <ios>
std::ios_base& unitbuf( std::ios_base& str );
(1)
std::ios_base& nounitbuf( std::ios_base& str );
(2)
Aktiviert oder deaktiviert die automatische Spülung der Ausgabe-Stream nach jedem Ausgabe-Operation. Hat keine Auswirkung auf Eingang .
Original:
Enables or disables automatic flushing of the output stream after any output operation. Has no effect on input.
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1)
ermöglicht die unitbuf Flagge in den Strom str, als ob durch den Aufruf str.setf(std::ios_base::unitbuf)
Original:
enables the unitbuf flag in the stream str as if by calling str.setf(std::ios_base::unitbuf)
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2)
deaktiviert die unitbuf Flagge in den Strom str, als ob durch den Aufruf str.unsetf(std::ios_base::unitbuf)
Original:
disables the unitbuf flag in the stream str as if by calling str.unsetf(std::ios_base::unitbuf)
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Dies ist ein I / O-Manipulators, kann es mit einem Expressionsvektor wie out << std::unitbuf für jede out vom Typ std::basic_ostream oder mit einem Expressionsvektor wie in >> std::unitbuf für jede in vom Typ std::basic_istream aufgerufen werden .
Original:
This is an I/O manipulator, it may be called with an expression such as out << std::unitbuf for any out of type std::basic_ostream or with an expression such as in >> std::unitbuf for any in of type std::basic_istream.
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Inhaltsverzeichnis

[Bearbeiten] Notes

Flushing in der Destruktor der std::basic_ostream::sentry Objekt durchgeführt wird, nennt die str.rdbuf()->pubsync() wenn str.flags() & std::ios_base::unitbuf == true .
Original:
Flushing is performed in the destructor of the std::basic_ostream::sentry object, which calls str.rdbuf()->pubsync() if str.flags() & std::ios_base::unitbuf == true.
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Die Standard-Output-Objekte std::cerr und std::wcerr haben ihre unitbuf Bit standardmäßig eingestellt .
Original:
The standard output objects std::cerr and std::wcerr have their unitbuf bit set by default.
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[Bearbeiten] Parameter

str -
Verweisen auf I / O-Strom
Original:
reference to I/O stream
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[Bearbeiten] Rückgabewert

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

Ohne std :: unitbuf oder anderen expliziten bündig, ist der Ausgang gleich, aber nicht in Echtzeit angezeigt .
Original:
Without std::unitbuf or another explicit flush, the output is the same, but does 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)..";
}
int main()
{
    volatile int sink=0;
    std::cout << std::unitbuf; // enable automatic flushing
 
    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)....(902 ms)....(1352 ms)....(1802 ms)....(2252 ms)..

[Bearbeiten] Siehe auch

spült die Ausgabe-Stream
Original:
flushes the output stream
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(Funktions-Template) [edit]
Ausgänge '\n' und spült den Ausgabe-Stream
Original:
outputs '\n' and flushes the output stream
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(Funktions-Template) [edit]