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std::basic_streambuf::uflow

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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
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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
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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
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Locales
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basic_streambuf::imbue
Posizionamento
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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
 
int_type uflow();
Assicura che almeno un carattere è disponibile nell'area di immissione aggiornando i puntatori alla zona di ingresso (se necessario). In caso di successo restituisce il valore di quel personaggio e fa avanzare il valore della arrivare puntatore di un carattere. Il ritorno di guasto traits::eof().
Original:
Ensures that at least one character is available in the input area by updating the pointers to the input area (if needed). On success returns the value of that character and advances the value of the get pointer by one character. On failure returns traits::eof().
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La funzione può aggiornare gptr, egptr e eback puntatori per definire la posizione dei dati appena caricati (se presenti). In caso di fallimento, la funzione fa sì che sia gptr() == nullptr o gptr() == egptr.
Original:
The function may update gptr, egptr and eback pointers to define the location of newly loaded data (if any). On failure, the function ensures that either gptr() == nullptr or gptr() == egptr.
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La versione della classe base delle chiamate di funzione underflow. Le classi derivate possono eseguire l'override di questa funzione per consentire gli aggiornamenti alla zona get in caso di esaurimento.
Original:
The base class version of the function calls underflow. The derived classes may override this function to allow updates to the get area in the case of exhaustion.
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Indice

[modifica] Parametri

(Nessuno)
Original:
(none)
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[modifica] Valore di ritorno

Il valore del carattere che è stato puntato dal puntatore ottenere' prima che fosse avanzata da uno o traits::eof() altrimenti.
Original:
The value of the character that was pointed to by the get pointer before it was advanced by one, or traits::eof() otherwise.
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La versione della classe base della funzione restituisce il valore restituito da underflow.
Original:
The base class version of the function returns the value returned by underflow.
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[modifica] Nota

Le funzioni pubbliche di std::streambuf chiamare questa funzione solo se gptr() == nullptr o gptr() >= egptr().
Original:
The public functions of std::streambuf call this function only if gptr() == nullptr or gptr() >= egptr().
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[modifica] Esempio

[modifica] Vedi anche

[virtuale]
legge caratteri dalla sequenza di input associato alla zona get
Original:
reads characters from the associated input sequence to the get area
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(virtuale protetto funzione membro) [edit]
[virtuale]
scrive caratteri della sequenza di emissione associato dalla zona put
Original:
writes characters to the associated output sequence from the put area
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(virtuale protetto funzione membro) [edit]