std::unitbuf, std::nounitbuf
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| Déclaré dans l'en-tête <ios>
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| 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 .
1) Original:
Enables or disables automatic flushing of the output stream after any output operation. Has no effect on input.
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permet le drapeau
2) unitbuf dans le flux str comme si en appelant str.setf(std::ios_base::unitbuf)Original:
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désactive le drapeau
unitbuf dans le flux str comme si en appelant str.unsetf(std::ios_base::unitbuf)Original:
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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.The text has been machine-translated via Google Translate.
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[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:
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[modifier] Paramètres
| str | - | référence aux flux d'entrée / sortie
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. |
[modifier] Retourne la valeur
str (référence au flux après la manipulation)Original:
str (reference to the stream after manipulation)The text has been machine-translated via Google Translate.
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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 The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction générique) | |
| sorties '\n' et vide le flux de sortie 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. (fonction générique) | |
