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std::basic_streambuf::setg

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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 setg( char_type* gbeg, char_type* gcurr, char_type* gend );
Imposta i valori dei puntatori definiscono l'area get. In particolare, dopo la chiamata eback() == gbeg, gptr() == gcurr, egptr() == gend
Original:
Sets the values of the pointers defining the get area. Specifically, after the call eback() == gbeg, gptr() == gcurr, egptr() == gend
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Indice

[modifica] Parametri

gbeg -
puntatore all'inizio della nuova zona get
Original:
pointer to the new beginning of the get area
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gcurr -
puntatore al nuovo carattere attuale ( arrivare puntatore) nella zona get
Original:
pointer to the new current character (get pointer) in the get area
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gend -
puntatore alla fine della nuova zona get
Original:
pointer to the new end of the get area
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[modifica] Valore di ritorno

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

[edit]
#include <iostream>
#include <sstream>
 
class null_filter_buf : public std::streambuf {
    std::streambuf* src;
    char ch; // single-byte buffer
protected:
    int underflow() {
        while( (ch= src->sbumpc()) == '\0') ; // skip zeroes
        setg(&ch, &ch, &ch+1); // make one read position available
        return ch; // may return EOF
    }
public:
    null_filter_buf(std::streambuf* buf) : src(buf) {
        setg(&ch, &ch+1, &ch+1); // buffer is initially full
    }
};
 
void filtered_read(std::istream& in)
{
    std::streambuf* orig = in.rdbuf();
    null_filter_buf buf(orig);
    in.rdbuf(&buf);
    for(char c; in.get(c); )
            std::cout << c;
    in.rdbuf(orig);
}
 
int main()
{
    char a[] = "This i\0s \0an e\0\0\0xample";
    std::istringstream in(std::string(std::begin(a), std::end(a)));
    filtered_read(in);
}

Output:

This is an example

[modifica] Vedi anche

riposiziona puntatori l'inizio, poi, e la fine della sequenza di emissione
Original:
repositions the beginning, next, and end pointers of the output sequence
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(protetto funzione membro) [edit]