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std::basic_filebuf::underflow

Da cppreference.com.
< cpp‎ | io‎ | basic filebuf

 
 
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_filebuf
Funzioni membro pubbliche
Original:
Public member functions
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basic_filebuf::basic_filebuf
basic_filebuf::~basic_filebuf
basic_filebuf::operator=(C++11)
basic_filebuf::swap(C++11)
basic_filebuf::is_open
basic_filebuf::open
basic_filebuf::close
Protetto funzioni membro
Original:
Protected member functions
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basic_filebuf::showmanyc
basic_filebuf::underflow
basic_filebuf::uflow
basic_filebuf::pbackfail
basic_filebuf::overflow
basic_filebuf::setbuf
basic_filebuf::seekoff
basic_filebuf::seekpos
basic_filebuf::sync
basic_filebuf::imbue
Non membri funzioni
Original:
Non-member functions
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swap(std::basic_filebuf)(C++11)
 
protected:
virtual int_type underflow()
Si comporta come il std::basic_streambuf::underflow classe base, tranne che per leggere i dati dalla sequenza di caratteri associata (file) nell'area get, prima legge i byte dal file in un buffer temporaneo (allocato grande come necessario), quindi utilizza std::codecvt::in di il locale intriso di convertire l'esterno (tipicamente, multibyte) la rappresentanza per la forma interna che viene poi utilizzato per popolare l'area get. La conversione può essere saltato se le impostazioni internazionali di std::codecvt::always_noconv torna true
Original:
Behaves like the base class std::basic_streambuf::underflow, except that to read the data from the associated character sequence (the file) into the get area, first reads the bytes from the file into a temporary buffer (allocated as large as necessary), then uses std::codecvt::in of the imbued locale to convert the external (typically, multibyte) representation to the internal form which is then used to populate the get area. The conversion may be skipped if the locale's std::codecvt::always_noconv returns true
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Indice

[modifica] Parametri

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

Traits::to_int_type(*gptr()) (il primo carattere della sequenza attesa) in caso di successo, o Traits::eof() in caso di guasto.
Original:
Traits::to_int_type(*gptr()) (the first character of the pending sequence) in case of success, or Traits::eof() in case of failure.
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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 of std::basic_streambuf membro) [edit]
[virtuale]
legge dal file associato e acconti il puntatore successivo nella zona get
Original:
reads from the associated file and advances the next pointer in the get area
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(virtuale protetto funzione membro) [edit]
[virtuale]
scrive i caratteri nel file associato dalla zona put
Original:
writes characters to the associated file from the put area
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(virtuale protetto funzione membro) [edit]