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std::unitbuf, std::nounitbuf

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< cpp‎ | io‎ | manip

 
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
Original:
Streams
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Abstractions
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
Original:
Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
Original:
Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
Original:
Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
D'entrée / sortie manipulateurs
À virgule flottante en forme
Original:
Floating-point formatting
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Formatage entier
Original:
Integer formatting
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Formatage booléen
Original:
Boolean formatting
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boolalpha
noboolalpha
Largeur de champ et de contrôle de remplissage
Original:
Field width and fill control
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Autre mise en forme
Original:
Other formatting
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Traitement des espaces blancs
Original:
Whitespace processing
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Sortie de rinçage
Original:
Output flushing
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unitbuf
nounitbuf
Indicateurs d'état manipulation
Original:
Status flags manipulation
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Temps et d'argent 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)
Active ou désactive rinçage automatique du courant de sortie après une opération de sortie. N'a aucun effet sur entrée .
Original:
Enables or disables automatic flushing of the output stream after any output operation. Has no effect on input.
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1)
permet le drapeau unitbuf dans le flux str comme si en appelant 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)
désactive le drapeau unitbuf dans le flux str comme si en appelant 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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Il s'agit d'un manipulateur d'E / S, il peut être appelé avec une expression telle que pour tout out << std::unitbuf out de std::basic_ostream type ou d'une expression telle que pour tout in >> std::unitbuf in de std::basic_istream type .
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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Sommaire

[modifier] Notes

Le rinçage est effectué dans le destructeur de l'objet std::basic_ostream::sentry, qui appelle str.rdbuf()->pubsync() si 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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Les objets de sortie standard std::cerr et std::wcerr ont leur bit unitbuf fixé par défaut .
Original:
The standard output objects std::cerr and std::wcerr have their unitbuf bit set by default.
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[modifier] Paramètres

str -
référence aux flux d'entrée / sortie
Original:
reference to I/O stream
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[modifier] Retourne la valeur

str (référence au flux après la manipulation)
Original:
str (reference to the stream after manipulation)
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[modifier] Exemple

Sans std :: unitbuf ou d'une autre couleur explicite, le résultat est le même, mais ne semble pas en temps réel .
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';
}

Résultat :

..(450 ms)....(902 ms)....(1352 ms)....(1802 ms)....(2252 ms)..

[modifier] Voir aussi

vide le flux de sortie
Original:
flushes the output stream
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(fonction générique) [edit]
sorties '\n' et vide le flux de sortie
Original:
outputs '\n' and flushes the output stream
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(fonction générique) [edit]