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std::basic_streambuf::pbump

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< cpp‎ | io‎ | basic streambuf

 
 
Ingresso / libreria di output
I / O manipolatori
C-style I / O
Buffer
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(deprecato)
Streams
Original:
Streams
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Astrazioni
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
File I / O
Original:
File I/O
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basic_ifstream
basic_ofstream
basic_fstream
String I / O
Original:
String I/O
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basic_istringstream
basic_ostringstream
basic_stringstream
Array I / O
Original:
Array I/O
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istrstream(deprecato)
ostrstream(deprecato)
strstream(deprecato)
Tipi
Original:
Types
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streamoff
streamsize
fpos
Errore categoria interfaccia
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_streambuf
Funzioni membro pubbliche
Original:
Public member functions
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basic_streambuf::~basic_streambuf
Versioni locali
Original:
Locales
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basic_streambuf::pubimbue
basic_streambuf::getloc
Posizionamento
Original:
Positioning
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basic_streambuf::pubsetbuf
basic_streambuf::pubseekoff
basic_streambuf::pubseekpos
basic_streambuf::pubsync
Prendi zona
Original:
Get area
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basic_streambuf::in_avail
basic_streambuf::snextc
basic_streambuf::sbumpc
basic_streambuf::sgetc
basic_streambuf::sgetn
Mettere zona
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
Protetto funzioni membro
Original:
Protected member functions
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basic_streambuf::basic_streambuf
basic_streambuf::operator=(C++11)
basic_streambuf::swap(C++11)
Versioni locali
Original:
Locales
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basic_streambuf::imbue
Posizionamento
Original:
Positioning
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basic_streambuf::setbuf
basic_streambuf::seekoff
basic_streambuf::seekpos
basic_streambuf::sync
Prendi zona
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
Mettere zona
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 );
Riposiziona il puntatore mettere (pptr()) da personaggi count, dove count può essere positivo o negativo. Nessun controllo viene fatto per spostare il puntatore fuori dall'area di messa [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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Se il puntatore è avanzato e quindi overflow() è chiamato a lavare la zona messa alla sequenza di caratteri associata, l'effetto è che i caratteri count supplementari con valori non definiti vengono emessi.
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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Indice

[modifica] Parametri

count -
numero da aggiungere al puntatore mettere
Original:
number to add to the put pointer
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[modifica] Valore di ritorno

(Nessuno)
Original:
(none)
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[modifica] Esempio

#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';
}

Output:

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

[modifica] Vedi anche

fa avanzare il puntatore successivo nella sequenza di input
Original:
advances the next pointer in the input sequence
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(protetto funzione membro) [edit]