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std::basic_streambuf::pbump

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< cpp‎ | io‎ | basic streambuf

 
 
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)
 
std::basic_streambuf
Fonctions membres publiques
Original:
Public member functions
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basic_streambuf::~basic_streambuf
Locales
Original:
Locales
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basic_streambuf::pubimbue
basic_streambuf::getloc
Positionnement
Original:
Positioning
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basic_streambuf::pubsetbuf
basic_streambuf::pubseekoff
basic_streambuf::pubseekpos
basic_streambuf::pubsync
Obtenez région
Original:
Get area
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basic_streambuf::in_avail
basic_streambuf::snextc
basic_streambuf::sbumpc
basic_streambuf::sgetc
basic_streambuf::sgetn
Mettez région
Original:
Put area
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basic_streambuf::sputc
basic_streambuf::sputn
Putback
Original:
Putback
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basic_streambuf::sputbackc
basic_streambuf::sungetc
Protégé fonctions membres
Original:
Protected member functions
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basic_streambuf::basic_streambuf
basic_streambuf::operator= (C++11)
basic_streambuf::swap (C++11)
Locales
Original:
Locales
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basic_streambuf::imbue
Positionnement
Original:
Positioning
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basic_streambuf::setbuf
basic_streambuf::seekoff
basic_streambuf::seekpos
basic_streambuf::sync
Obtenez région
Original:
Get area
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basic_streambuf::showmanyc
basic_streambuf::underflow
basic_streambuf::uflow
basic_streambuf::xsgetn
basic_streambuf::eback
basic_streambuf::gptr
basic_streambuf::egptr
basic_streambuf::gbump
basic_streambuf::setg
Mettez région
Original:
Put area
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basic_streambuf::xsputn
basic_streambuf::overflow
basic_streambuf::pbase
basic_streambuf::pptr
basic_streambuf::epptr
basic_streambuf::pbump
basic_streambuf::setp
Putback
Original:
Putback
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basic_streambuf::pbackfail
 
void pbump( int count );
Repositionne le pointeur de mettre (pptr()) par des caractères count, où count peuvent être positifs ou négatifs. Aucun contrôle n'est effectué pour déplacer le pointeur à l'extérieur de la zone de mise [pbase(), epptr()) .
Original:
Repositions the put pointer (pptr()) by count characters, where count may be positive or negative. No checks are done for moving the pointer outside the put area [pbase(), epptr()).
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Si le pointeur est avancé et puis overflow() est appelé à rincer la zone à mettre la séquence de caractères associé, l'effet est que les personnages count supplémentaires avec des valeurs non définies sont de sortie .
Original:
If the pointer is advanced and then overflow() is called to flush the put area to the associated character sequence, the effect is that extra count characters with undefined values are output.
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Sommaire

[modifier] Paramètres

count -
nombre à ajouter au pointeur d'écriture
Original:
number to add to the put pointer
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[modifier] Retourne la valeur

(Aucun)
Original:
(none)
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[modifier] Exemple

#include <iostream>
#include <string>
#include <fstream>
 
struct showput_streambuf : std::filebuf
{
    using std::filebuf::pbump; // expose protected
    std::string showput() const {
        return std::string(pbase(), pptr());
    }
};
 
int main()
{
    showput_streambuf mybuf;
    mybuf.open("test.txt", std::ios_base::out);
    std::ostream str(&mybuf);
    str << "This is a test" << std::flush << "1234";
    std::cout << "The put area contains: " << mybuf.showput() << '\n';
    mybuf.pbump(10);
    std::cout << "after pbump(10), it contains " << mybuf.showput() << '\n';
}

Résultat :

The put area contains: 1234
after pbump(10), it contains 1234 is a test

[modifier] Voir aussi

avancer le pointeur suivant de la séquence d'entrée
Original:
advances the next pointer in the input sequence
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(fonction membre protégée) [edit]