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std::basic_istream::readsome

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< cpp‎ | io‎ | basic istream

 
 
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_istream
Gli oggetti globali
Original:
Global objects
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cin
wcin
Membri funzioni
Original:
Member functions
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basic_istream::basic_istream
basic_istream::~basic_istream
basic_istream::operator=(C++11)
Ingresso formattato
Original:
Formatted input
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basic_istream::operator>>
Ingresso non formattato
Original:
Unformatted input
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basic_istream::get
basic_istream::peek
basic_istream::unget
basic_istream::putback
basic_istream::getline
basic_istream::ignore
basic_istream::read
basic_istream::readsome
basic_istream::gcount
Posizionamento
Original:
Positioning
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basic_istream::tellg
basic_istream::seekg
Varie
Original:
Miscellaneous
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basic_istream::sync
basic_istream::swap(C++11)
Membri classi
Original:
Member classes
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basic_istream::sentry
Non membri funzioni
Original:
Non-member functions
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operator>>(std::basic_istream)
 
std::streamsize readsome( char_type* s, std::streamsize count );
Estrae i caratteri immediatamente disponibile dal flusso di input.
Original:
Extracts immediately available characters from the input stream.
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Si comporta come UnformattedInputFunction. Dopo la costruzione e la verifica dell'oggetto sentinella,
Original:
Behaves as UnformattedInputFunction. After constructing and checking the sentry object,
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Se rdbuf()->in_avail() == -1, chiama setstate(eofbit) ed estrae nessun carattere.
Original:
If rdbuf()->in_avail() == -1, calls setstate(eofbit) and extracts no characters.
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Se rdbuf()->in_avail() == 0, estrae nessun carattere.
Original:
If rdbuf()->in_avail() == 0, extracts no characters.
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Se rdbuf()->in_avail() > 0, estratti std::min(rdbuf()->in_avail(), count)) personaggi e li memorizza in posizioni successive della matrice characater il cui primo elemento è puntato da s.
Original:
If rdbuf()->in_avail() > 0, extracts std::min(rdbuf()->in_avail(), count)) characters and stores them into successive locations of the characater array whose first element is pointed to by s.
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Indice

[modifica] Note

Il comportamento di questa funzione è altamente specifica dell'implementazione. Ad esempio, quando viene utilizzato con std::ifstream, alcuni compilatori riempire il filebuf sottostante con i dati appena il file viene aperto (e readsome () su tali compilatori legge dati, potenzialmente, ma non necessariamente, l'intero file), mentre altri compilatori leggere solo da file quando un'operazione di ingresso effettivo è richiesto (e readsome (), rilasciati dopo l'apertura del file non estrae i caratteri). Allo stesso modo, una chiamata a std::cin.readsome() può restituire tutti gli input in attesa console allo stato naturale, o può sempre restituire zero ed estrarre nessun carattere.
Original:
The behavior of this function is highly implementation-specific. For example, when used with std::ifstream, some compilers fill the underlying filebuf with data as soon as the file is opened (and readsome() on such compilers reads data, potentially, but not necessarily, the entire file), while other compilers only read from file when an actual input operation is requested (and readsome() issued after file opening never extracts any characters). Likewise, a call to std::cin.readsome() may return all pending unprocessed console input, or may always return zero and extract no characters.
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[modifica] Parametri

s -
puntatore alla matrice di caratteri per memorizzare i caratteri
Original:
pointer to the character array to store the characters to
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count -
numero massimo di caratteri da leggere
Original:
maximum number of characters to read
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[modifica] Valore di ritorno

numero di caratteri effettivamente estratto.
Original:
number of characters actually extracted.
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[modifica] Esempio

[modifica] Vedi anche

estrae blocchi di caratteri
Original:
extracts blocks of characters
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(membro pubblico funzione) [edit]