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std::ios_base::sync_with_stdio

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< cpp‎ | io‎ | ios base

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C++
 
D'entrée / sortie de bibliothèque
I / O manipulateurs
C-style I / O
Tampons
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Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf (obsolète)
Cours d'eau
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Streams
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Abstractions
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Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Fichier E / O
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File I/O
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basic_ifstream
basic_ofstream
basic_fstream
Chaîne I / O
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String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Tableau I / O
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Array I/O
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istrstream (obsolète)
ostrstream (obsolète)
strstream (obsolète)
Types
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Types
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streamoff
streamsize
fpos
Interface catégorie d'erreur
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Error category interface
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iostream_category (C++11)
io_errc (C++11)
 
std::ios_base
Les fonctions membres
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Member functions
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ios_base::ios_base
ios_base::~ios_base
Mise en forme
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Formatting
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ios_base::flags
ios_base::setf
ios_base::unsetf
ios_base::precision
ios_base::width
Locales
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Locales
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ios_base::imbue
ios_base::getloc
Interne gamme extensible
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Internal extensible array
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ios_base::xalloc
ios_base::iword
ios_base::pword
Divers
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Miscellaneous
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ios_base::register_callback
ios_base::sync_with_stdio
Classes de membres
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Member classes
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ios_base::failure
ios_base::Init
Types de membres
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Member types
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ios_base::openmode
ios_base::fmtflags
ios_base::iostate
ios_base::seekdir
ios_base::event
ios_base::event_callback
 
static bool sync_with_stdio( bool sync = true );
Indiquer que la norme std::cin, std::cout, std::cerr, std::clog, std::wcin, std::wcout, std::wcerr et std::wclog C + + flux sont synchronisés à la norme stdin, stdout, stderr et C stdlog flux après chaque opération d'entrée / sortie .
Original:
Sets whether the standard std::cin, std::cout, std::cerr, std::clog, std::wcin, std::wcout, std::wcerr and std::wclog C++ streams are synchronized to the standard stdin, stdout, stderr and stdlog C streams after each input/output operation.
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Pour une str flux standard, synchronisé avec le flux f C, les paires de fonctions suivantes ont un effet identique:
Original:
For a standard stream str, synchronized with the C stream f, the following pairs of functions have identical effect:
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1) std::fputc(f, c) and str.rdbuf()->sputc(c)
2) std::fgetc(f) and str.rdbuf()->sbumpc(c)
3) std::ungetc(c, f) and str.rdbuf()->sputbackc(c)
Dans la pratique, cela signifie que le C + + et C utilisent les cours d'eau du même tampon, et, par conséquent, peuvent être mélangés librement. En outre, synchronisé C + + flux sont garantis thread-safe (individuel sortie personnages de plusieurs threads peuvent s'imbriquer, mais pas de races de données se produisent)
Original:
In practice, this means that the C++ and the C streams use the same buffer, and therefore, can be mixed freely. In addition, synchronized C++ streams are guaranteed to be thread-safe (individual characters output from multiple threads may interleave, but no data races occur)
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Si la synchronisation n'est pas activé, le C + + flux standards sont autorisés à amortir leur E / S de façon indépendante, qui peuvent être beaucoup plus rapide dans certains cas .
Original:
If the synchronization is turned off, the C++ standard streams are allowed to buffer their I/O independently, which may be considerably faster in some cases.
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Par défaut, tous les huit standards C + + flux sont synchronisés avec leurs sources respectives C .
Original:
By default, all eight standard C++ streams are synchronized with their respective C streams.
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Il est défini par l'implémentation si cette fonction n'a aucun effet si elle est appelée après un certain E / S s'est produite dans le flux standard .
Original:
It is implementation-defined if this function has any effect if called after some I/O occurred on the standard stream.
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Sommaire

[modifier] Paramètres

sync -
le réglage de synchronisation
Original:
the new synchronization setting
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[modifier] Retourne la valeur

état de synchronisation avant l'appel de la fonction
Original:
synchronization state before the call to the function
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[modifier] Exemple

#include <iostream>
#include <cstdio>
int main()
{
    std::cout.sync_with_stdio(false);
    std::cout << "a\n";
    std::printf("b\n");
    std::cout << "c\n";
}

Résultat : 

b
a
c

[modifier] Voir aussi
écrit à la norme C stdout
(
objet global
Original:
global object
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) flux de sortie
Original:
writes to the standard C output stream stdout
(
objet global
Original:
global object
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)
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[edit]
écrit dans le flux d'erreur standard C stderr, unbuffered
(
objet global
Original:
global object
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)
Original:
writes to the standard C error stream stderr, unbuffered
(
objet global
Original:
global object
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)
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[edit]
écrit à la norme C stderr
(
objet global
Original:
global object
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) flux d'erreur
Original:
writes to the standard C error stream stderr
(
objet global
Original:
global object
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)
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[edit]
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