std::basic_stringbuf::setbuf
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< cpp | io | basic stringbuf
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protected: virtualstd::basic_streambuf<CharT, Traits>* setbuf( char_type* s, std::streamsize n ) | ||
Si
s est un pointeur nul et n est égal à zéro, cette fonction n'a aucun effet .Original:
If
s is a null pointer and n is zero, this function has no effect.The text has been machine-translated via Google Translate.
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Dans le cas contraire, l'effet est définie par l'implémentation: certaines implémentations ne rien faire, tandis que certaines implémentations effacer le membre std::string actuellement utilisé comme tampon et commencer à utiliser le tableau de caractères fournie par l'utilisateur de
n taille, dont le premier élément est pointé par s, comme le tampon et la séquence de caractères d'entrée / sortie .Original:
Otherwise, the effect is implementation-defined: some implementations do nothing, while some implementations clear the std::string member currently used as the buffer and begin using the user-supplied character array of size
n, whose first element is pointed to by s, as the buffer and the input/output character sequence.The text has been machine-translated via Google Translate.
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Cette fonction est protégée virtuel, il ne peut être appelé par
pubsetbuf() ou de fonctions membres d'une classe définie par l'utilisateur dérivée de std::basic_stringbuf .Original:
This function is protected virtual, it may only be called through
pubsetbuf() or from member functions of a user-defined class derived from std::basic_stringbuf.The text has been machine-translated via Google Translate.
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Sommaire |
[modifier]Paramètres
| s | - | pointeur vers le premier octet dans le tampon fourni par l'utilisateur ou nulle Original: pointer to the first byte in the user-provided buffer or null The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| n | - | le nombre d'octets dans le tampon fourni par l'utilisateur ou zéro Original: the number of bytes in the user-provided buffer or zero 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
*this, jeté à la classe de base
std::basic_streambuf .Original:
*this, cast to the base class
std::basic_streambuf.The text has been machine-translated via Google Translate.
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[modifier]Notes
Le std::strstreambuf flux obsolète tampon ou la
boost::basic_array dispositif boost.IOStreams peuvent être utilisés pour mettre en œuvre d'E / S en mémoire tampon sur une fournie par l'utilisateur tableau de caractères de manière portable .Original:
The deprecated stream buffer std::strstreambuf or the boost.IOStreams device
boost::basic_array may be used to implement I/O buffering over a user-provided char array in portable manner.The text has been machine-translated via Google Translate.
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[modifier]Exemple
Test de la fonctionnalité setbuf la stringstream de
Original:
Test for the stringstream's setbuf functionality
The text has been machine-translated via Google Translate.
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#include <iostream>#include <sstream>int main(){std::ostringstream ss;char c[1024]={}; ss.rdbuf()->pubsetbuf(c, 1024); ss <<3.14<<'\n';std::cout<< c <<'\n';}
Résultat :
3.14 (on GNU g++/libstdc++ and SunPro C++/roguewave) <nothing> (on MS Visual Studio 2010, SunPro C++/stlport4, CLang++/libc++)
[modifier]Voir aussi
Invoque setbuf() Original: invokes setbuf() The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (fonction membre publique de std::basic_streambuf) | |
