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std::basic_streambuf::pubsetbuf, std::basic_streambuf::setbuf

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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
 
basic_streambuf<CharT,Traits>* pubsetbuf( char_type* s, std::streamsize n )
(1)
protected:
virtual basic_streambuf<CharT,Traits>* setbuf( char_type* s, std::streamsize n )
(2)
1)
Chiamate setbuf(s, n) della classe più derivata
Original:
Calls setbuf(s, n) of the most derived class
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2)
La versione della classe base di questa funzione non ha effetto. Le classi derivate possono eseguire l'override di questa funzione per consentire la rimozione o sostituzione della sequenza di caratteri controllata (il buffer) con un fornito dall'utente matrice, o per qualsiasi altra applicazione specifica finalità.
Original:
The base class version of this function has no effect. The derived classes may override this function to allow removal or replacement of the controlled character sequence (the buffer) with a user-provided array, or for any other implementation-specific purpose.
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Indice

[modifica] Parametri

s -
puntatore al primo byte nel tampone fornito dall'utente
Original:
pointer to the first byte in the user-provided buffer
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n -
il numero di byte nel buffer di fornito dall'utente
Original:
the number of bytes in the user-provided buffer
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[modifica] Valore di ritorno

*this

[modifica] Esempio

fornire un buffer 10k per la lettura. Su Linux, il programma di utilità strace può essere utilizzato per osservare il numero effettivo di byte letti
Original:
provide a 10k buffer for reading. On linux, the strace utility may be used to observe the actual number of bytes read
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#include <fstream>
#include <iostream>
#include <string>
 
int main()
{
    int cnt=0;
    std::ifstream file;
    char buf[10241];
    file.rdbuf()->pubsetbuf(buf, sizeof buf);
    file.open("/usr/share/dict/words");
    for (std::string line; getline(file, line); ) {
        cnt++;
    }
 
    std::cout << cnt << '\n';
}


[modifica] Vedi anche

[virtuale]
fornisce fornito dall'utente buffer o trasforma questo filebuf senza buffer
Original:
provides user-supplied buffer or turns this filebuf unbuffered
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(virtuale protetto funzione of std::basic_filebuf membro) [edit]