Namespace
Varianti

std::unitbuf, std::nounitbuf

Da cppreference.com.
< cpp‎ | io‎ | manip

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File 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(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
Ingresso / uscita manipolatori
Virgola mobile formattazione
Original:
Floating-point formatting
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Formattazione Integer
Original:
Integer formatting
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Formattazione Boolean
Original:
Boolean formatting
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boolalpha
noboolalpha
Larghezza del campo e il controllo di riempimento
Original:
Field width and fill control
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Di formattazione
Original:
Other formatting
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Elaborazione degli spazi vuoti
Original:
Whitespace processing
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Uscita di lavaggio
Original:
Output flushing
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unitbuf
nounitbuf
Flag di stato manipolazione
Original:
Status flags manipulation
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Tempo e denaro 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)
Attiva o disattiva lavaggio automatico del flusso di output dopo ogni operazione di uscita. Non ha alcun effetto su ingresso.
Original:
Enables or disables automatic flushing of the output stream after any output operation. Has no effect on input.
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1)
consente la bandiera unitbuf nel str flusso come se chiamando 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)
disabilita la bandiera unitbuf nel str flusso come se chiamando 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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Si tratta di un manipolatore di I / O, può essere chiamato con espressioni quali out << std::unitbuf per qualsiasi out di std::basic_ostream tipo o con un'espressione come in >> std::unitbuf per qualsiasi in di std::basic_istream tipo.
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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Indice

[modifica] Note

Flushing viene eseguita nel distruttore dell'oggetto std::basic_ostream::sentry, che chiama se str.rdbuf()->pubsync() 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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Gli oggetti di uscita standard e std::cerr std::wcerr hanno la loro parte unitbuf impostato di default.
Original:
The standard output objects std::cerr and std::wcerr have their unitbuf bit set by default.
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[modifica] Parametri

str -
riferimento al flusso di I / O
Original:
reference to I/O stream
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[modifica] Valore di ritorno

str (riferimento al flusso dopo la manipolazione)
Original:
str (reference to the stream after manipulation)
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[modifica] Esempio

Senza std :: unitbuf o un altro filo esplicito, l'uscita è lo stesso, ma non appare in tempo reale .
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)..

[modifica] Vedi anche

svuota il flusso di output
Original:
flushes the output stream
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(funzione di modello) [edit]
uscite '\n' e colori nel flusso di output
Original:
outputs '\n' and flushes the output stream
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(funzione di modello) [edit]