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std::basic_streambuf::pbump

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< cpp‎ | io‎ | basic streambuf

 
 
Input / Output-Bibliothek
I / O-Manipulatoren
C-style I / O
Puffern
Original:
Buffers
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basic_streambuf
basic_filebuf
basic_stringbuf
strstreambuf(veraltet)
Streams
Original:
Streams
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Abstraktionen
Original:
Abstractions
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ios_base
basic_ios
basic_istream
basic_ostream
basic_iostream
Datei-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(veraltet)
ostrstream(veraltet)
strstream(veraltet)
Types
Original:
Types
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streamoff
streamsize
fpos
Fehler Kategorie Schnittstelle
Original:
Error category interface
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iostream_category(C++11)
io_errc(C++11)
 
std::basic_streambuf
Öffentliche Member-Funktionen
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
Positionierung
Original:
Positioning
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basic_streambuf::pubsetbuf
basic_streambuf::pubseekoff
basic_streambuf::pubseekpos
basic_streambuf::pubsync
Get area
Original:
Get area
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basic_streambuf::in_avail
basic_streambuf::snextc
basic_streambuf::sbumpc
basic_streambuf::sgetc
basic_streambuf::sgetn
Legen Bereich
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
Geschützt Member-Funktionen
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
Positionierung
Original:
Positioning
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basic_streambuf::setbuf
basic_streambuf::seekoff
basic_streambuf::seekpos
basic_streambuf::sync
Get area
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
Legen Bereich
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 );
Positioniert die Schreibzeigers (pptr()) durch count Zeichen, wobei count positiv oder negativ sein kann. Keine Schecks werden zum Bewegen der Zeiger außerhalb der Put-Bereich [pbase(), epptr()) getan .
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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Wenn der Zeiger fortgeschrittenen und dann overflow() aufgerufen wird, um die Put-Bereich zugehörigen Zeichenfolge spülen, ist der Effekt, dass zusätzliche count Zeichen mit undefinierten Werten ausgegeben werden .
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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Inhaltsverzeichnis

[Bearbeiten] Parameter

count -
Zahl der Put-Zeiger hinzuzufügen
Original:
number to add to the put pointer
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[Bearbeiten] Rückgabewert

(None)
Original:
(none)
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[Bearbeiten] Beispiel

#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

[Bearbeiten] Siehe auch

Fortschritte der nächste Zeiger in der Eingabesequenz
Original:
advances the next pointer in the input sequence
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(geschützt Member-Funktion) [edit]