std::unitbuf, std::nounitbuf

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Ingresso / libreria di output

I / O manipolatori

C-style I / O

Buffer Original: Buffers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_streambuf

basic_filebuf

basic_stringbuf

strstreambuf (deprecato)

Streams Original: Streams The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Astrazioni Original: Abstractions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

ios_base

basic_ios

basic_istream

basic_ostream

basic_iostream

File I / O Original: File I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_ifstream

basic_ofstream

basic_fstream

String I / O Original: String I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

basic_istringstream

basic_ostringstream

basic_stringstream

Array I / O Original: Array I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

istrstream (deprecato)

ostrstream (deprecato)

strstream (deprecato)

Tipi Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

streamoff

streamsize

fpos

Errore categoria interfaccia Original: Error category interface The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

iostream_category (C++11)

io_errc (C++11)

 

Ingresso / uscita manipolatori

Virgola mobile formattazione Original: Floating-point formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
showpoint noshowpoint setprecision	fixed scientific hexfloat defaultfloat (C++11) (C++11)
Formattazione Integer Original: Integer formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setbase showbase noshowbase	dec hex oct
Formattazione Boolean Original: Boolean formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
boolalpha noboolalpha
Larghezza del campo e il controllo di riempimento Original: Field width and fill control The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
setfill setw	internal left right
Di formattazione Original: Other formatting The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
showpos noshowpos	uppercase nouppercase
Elaborazione degli spazi vuoti Original: Whitespace processing The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
ws ends	skipws noskipws
Uscita di lavaggio Original: Output flushing The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
flush endl	unitbuf nounitbuf
Flag di stato manipolazione Original: Status flags manipulation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
resetiosflags	setiosflags
Tempo e denaro I / O Original: Time and money I/O The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
get_money (C++11) get_time (C++11)	put_money (C++11) put_time (C++11)

 

Elemento definito nell'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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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::cerrstd::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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Parametri

str

-

riferimento al flusso di I / O Original: reference to I/O stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

str (riferimento al flusso dopo la manipolazione)

Original:

str (reference to the stream after manipulation)

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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(){volatileint 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 workauto 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)..

Vedi anche

flush	svuota il flusso di output Original: 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. (funzione di modello)
endl	uscite '\n' e colori nel flusso di output 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. (funzione di modello)