Namespace
Varianti

std::basic_ifstream

Da cppreference.com.
< cpp‎ | io


 
 
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_ifstream
Membri funzioni
Original:
Member functions
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basic_ifstream::basic_ifstream
basic_ifstream::operator=(C++11)
basic_ifstream::swap(C++11)
basic_ifstream::rdbuf
Operazioni sui file
Original:
File operations
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basic_ifstream::is_open
basic_ifstream::open
basic_ifstream::close
Non membri funzioni
Original:
Non-member functions
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basic_ifstream::swap(std::basic_ifstream)(C++11)
 
Defined in header <fstream>
template<

    class CharT,
    class Traits = std::char_traits<CharT>

> class basic_ifstream : public basic_istream<CharT, Traits>
Il basic_ifstream modello di classe implementa operazioni di alto livello di ingresso di file basati su flussi. Si interfaccia basata su file streambuffer (std::basic_filebuf) con l'interfaccia di alto livello di (std::basic_istream).
Original:
The class template basic_ifstream implements high-level input operations on file based streams. It interfaces a file-based streambuffer (std::basic_filebuf) with the high-level interface of (std::basic_istream).
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Una tipica implementazione di std::basic_ifstream contiene solo un non-derivato membro di dati: un caso di std::basic_filebuf<CharT, Traits>.
Original:
A typical implementation of std::basic_ifstream holds only one non-derived data member: an instance of std::basic_filebuf<CharT, Traits>.
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cpp/io/ios basecpp/io/basic ioscpp/io/basic istreamstd-basic ifstream-inheritance.svg
Informazioni sull'immagine

Inheritance diagram

Due specializzazioni per i tipi di caratteri comuni sono anche definiti:
Original:
Two specializations for common character types are also defined:
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Defined in header <fstream>
Tipo
Original:
Type
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Definition
ifstream basic_ifstream<char>
wifstream basic_ifstream<wchar_t>

Indice

[modifica] Membri tipi

Membro tipo
Original:
Member type
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Definition
char_type CharT[edit]
traits_type Traits[edit]
int_type Traits::int_type[edit]
pos_type Traits::pos_type[edit]
off_type Traits::off_type[edit]

[modifica] Membri funzioni

costruisce il flusso di file
Original:
constructs the file stream
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(membro pubblico funzione) [edit]
(destructor)
[virtuale] (dichiarato in modo implicito)
destructs the basic_ifstream and the associated buffer, closes the file
(pubblico virtuale membro funzione) [edit]
(C++11)
sposta il flusso di file
Original:
moves the file stream
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(membro pubblico funzione) [edit]
(C++11)
Scambia due flussi di file
Original:
swaps two file streams
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(membro pubblico funzione) [edit]
restituisce l'oggetto sottostante raw file di dispositivo
Original:
returns the underlying raw file device object
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(membro pubblico funzione) [edit]
Operazioni sui file
Original:
File operations
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controlla se il flusso è associato un file
Original:
checks if the stream has an associated file
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(membro pubblico funzione) [edit]
apre un file e lo associa con il flusso
Original:
opens a file and associates it with the stream
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(membro pubblico funzione) [edit]
chiude il file associato
Original:
closes the associated file
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(membro pubblico funzione) [edit]

[modifica] Non membri funzioni

specializzata l'algoritmo std::swap
Original:
specializes the std::swap algorithm
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(funzione di modello) [edit]


Inherited from std::basic_istream

Member functions

Ingresso formattato
Original:
Formatted input
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estratti i dati formattati
Original:
extracts formatted data
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(membro pubblico of std::basic_istream funzione) [edit]
Ingresso non formattato
Original:
Unformatted input
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estratti di caratteri
Original:
extracts characters
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(membro pubblico of std::basic_istream funzione) [edit]
legge il carattere successivo senza estrarlo
Original:
reads the next character without extracting it
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(membro pubblico of std::basic_istream funzione) [edit]
unextracts un carattere
Original:
unextracts a character
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(membro pubblico of std::basic_istream funzione) [edit]
mette carattere nel flusso di input
Original:
puts character into input stream
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(membro pubblico of std::basic_istream funzione) [edit]
caratteri estratti fino a quando il carattere dato è stato trovato
Original:
extracts characters until the given character is found
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(membro pubblico of std::basic_istream funzione) [edit]
estratti e personaggi scarta fino a quando il carattere dato è stato trovato
Original:
extracts and discards characters until the given character is found
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(membro pubblico of std::basic_istream funzione) [edit]
estrae blocchi di caratteri
Original:
extracts blocks of characters
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(membro pubblico of std::basic_istream funzione) [edit]
estrae blocchi già disponibili di caratteri
Original:
extracts already available blocks of characters
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(membro pubblico of std::basic_istream funzione) [edit]
Restituisce il numero dei caratteri estratti con l'ultima operazione di ingresso non formattato
Original:
returns number of characters extracted by last unformatted input operation
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(membro pubblico of std::basic_istream funzione) [edit]
Posizionamento
Original:
Positioning
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restituisce l'indicatore di posizione di ingresso
Original:
returns the input position indicator
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(membro pubblico of std::basic_istream funzione) [edit]
sets the input position indicator
(membro pubblico of std::basic_istream funzione) [edit]
Varie
Original:
Miscellaneous
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sincronizza con il dispositivo di archiviazione sottostante
Original:
synchronizes with the underlying storage device
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(membro pubblico of std::basic_istream funzione) [edit]

Member classes

implements basic logic for preparation of the stream for input operations
(membro pubblico of std::basic_istream classe) [edit]


Inherited from std::basic_ios

Member types

Membro tipo
Original:
Member type
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Definition
char_type CharT
traits_type Traits
int_type Traits::int_type
pos_type Traits::pos_type
off_type Traits::off_type
Le funzioni dello Stato
Original:
State functions
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controlla se nessun errore si è verificato ad esempio I / O sono disponibili
Original:
checks if no error has occurred i.e. I/O operations are available
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(membro pubblico of std::basic_ios funzione) [edit]
controlli se end-of-file è stato raggiunto
Original:
checks if end-of-file has been reached
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(membro pubblico of std::basic_ios funzione) [edit]
Verifica se un errore recuperabile è verificato
Original:
checks if a recoverable error has occurred
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(membro pubblico of std::basic_ios funzione) [edit]
Verifica se un errore non recuperabile è verificato
Original:
checks if a non-recoverable error has occurred
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(membro pubblico of std::basic_ios funzione) [edit]
controlla se è verificato un errore (sinonimo di fail())
Original:
checks if an error has occurred (synonym of fail())
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(membro pubblico of std::basic_ios funzione) [edit]
(C fino + 11)
(dal C++11)
verifica se non si sono verificati errori (sinonimo di !fail())
Original:
checks if no error has occurred (synonym of !fail())
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(membro pubblico of std::basic_ios funzione) [edit]
restituisce flag di stato
Original:
returns state flags
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(membro pubblico of std::basic_ios funzione) [edit]
imposta i flag di stato
Original:
sets state flags
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(membro pubblico of std::basic_ios funzione) [edit]
cancella flag di errore e eof
Original:
clears error and eof flags
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(membro pubblico of std::basic_ios funzione) [edit]
Formattazione
Original:
Formatting
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copie informazioni di formattazione
Original:
copies formatting information
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(membro pubblico of std::basic_ios funzione) [edit]
gestisce il carattere di riempimento
Original:
manages the fill character
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(membro pubblico of std::basic_ios funzione) [edit]
Varie
Original:
Miscellaneous
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manages exception mask
(membro pubblico of std::basic_ios funzione) [edit]
imposta il locale
Original:
sets the locale
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(membro pubblico of std::basic_ios funzione) [edit]
gestisce buffer del flusso associato
Original:
manages associated stream buffer
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(membro pubblico of std::basic_ios funzione) [edit]
gestisce flusso legato
Original:
manages tied stream
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(membro pubblico of std::basic_ios funzione) [edit]
restringe caratteri
Original:
narrows characters
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(membro pubblico of std::basic_ios funzione) [edit]
widens characters
(membro pubblico of std::basic_ios funzione) [edit]

Inherited from std::ios_base

Member functions

Formattazione
Original:
Formatting
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gestisce i flag di formato
Original:
manages format flags
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(membro pubblico of std::ios_base funzione) [edit]
imposta flag specifico formato
Original:
sets specific format flag
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(membro pubblico of std::ios_base funzione) [edit]
clears specific format flag
(membro pubblico of std::ios_base funzione) [edit]
gestisce la precisione decimale di operazioni in virgola mobile
Original:
manages decimal precision of floating point operations
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(membro pubblico of std::ios_base funzione) [edit]
manages field width
(membro pubblico of std::ios_base funzione) [edit]
Versioni locali
Original:
Locales
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imposta locale
Original:
sets locale
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(membro pubblico of std::ios_base funzione) [edit]
restituisce locale corrente
Original:
returns current locale
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(membro pubblico of std::ios_base funzione) [edit]
Interno di matrice estensibile
Original:
Internal extensible array
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[statico]
restituisce un programma a livello di intero univoco che è sicuro da usare come indice per pword () e iword ()
Original:
returns a program-wide unique integer that is safe to use as index to pword() and iword()
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(public static membro of std::ios_base funzione) [edit]
ridimensiona l'ammasso privato e, se necessario, l'accesso all'elemento long in corrispondenza dell'indice specificato
Original:
resizes the private storage if necessary and access to the long element at the given index
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(membro pubblico of std::ios_base funzione) [edit]
ridimensiona l'ammasso privato e, se necessario, l'accesso all'elemento void* in corrispondenza dell'indice specificato
Original:
resizes the private storage if necessary and access to the void* element at the given index
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(membro pubblico of std::ios_base funzione) [edit]
Varie
Original:
Miscellaneous
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registers event callback function
(membro pubblico of std::ios_base funzione) [edit]
Permette di scegliere se C + + e C librerie IO sono interoperabili
Original:
sets whether C++ and C IO libraries are interoperable
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(public static membro of std::ios_base funzione) [edit]
Membri classi
Original:
Member classes
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flusso di eccezione
Original:
stream exception
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(membro pubblico of std::ios_base classe) [edit]
inizializza oggetti stream standard
Original:
initializes standard stream objects
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(membro pubblico of std::ios_base classe) [edit]

Tipi di membri e costanti
Original:
Member types and constants
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Tipo
Original:
Type
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Explanation
flusso di tipo modalità di apertura

Le costanti sono anche definiti:

Constant
Original:
Constant
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Explanation[edit]
app
cercano alla fine del flusso prima di ogni scrittura
Original:
seek to the end of stream before each write
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[edit]
binary
aperto in modalità binaria
Original:
open in binary mode
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[edit]
in
aprire per la lettura
Original:
open for reading
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[edit]
out
aperto per la scrittura
Original:
open for writing
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[edit]
trunc
scartare il contenuto del flusso durante l'apertura
Original:
discard the contents of the stream when opening
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[edit]
ate
cercano di fine flusso subito dopo aperto
Original:
seek to the end of stream immediately after open
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[edit]
Original:
stream open mode type

The following constants are also defined:

Constant
Original:
Constant
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Explanation[edit]
app
cercano alla fine del flusso prima di ogni scrittura
Original:
seek to the end of stream before each write
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[edit]
binary
aperto in modalità binaria
Original:
open in binary mode
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[edit]
in
aprire per la lettura
Original:
open for reading
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[edit]
out
aperto per la scrittura
Original:
open for writing
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[edit]
trunc
scartare il contenuto del flusso durante l'apertura
Original:
discard the contents of the stream when opening
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[edit]
ate
cercano di fine flusso subito dopo aperto
Original:
seek to the end of stream immediately after open
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[edit]
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(typedef) [edit]
formattazione bandiere tipo

Le costanti sono anche definiti:

Constant
Original:
Constant
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Explanation[edit]
dec
utilizzare base decimale per intero I / O
Original:
use decimal base for integer I/O
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[edit]
oct
utilizzare ottale base per intero di I / O
Original:
use octal base for integer I/O
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[edit]
hex
utilizzare base esadecimale per intero I / O
Original:
use hexadecimal base for integer I/O
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[edit]
basefield
dec|oct|hex|0. Utile per mascherare operazioni
Original:
dec|oct|hex|0. Useful for masking operations
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[edit]
left
regolazione sinistra (aggiunge caratteri di riempimento a destra)
Original:
left adjustment (adds fill characters to the right)
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[edit]
right
giusta regolazione (aggiunge caratteri di riempimento a sinistra)
Original:
right adjustment (adds fill characters to the left)
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[edit]
internal
regolazione interna (aggiunge caratteri di riempimento fino al punto interno designato)
Original:
internal adjustment (adds fill characters to the internal designated point)
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[edit]
adjustfield
left|right|internal. Utile per mascherare operazioni
Original:
left|right|internal. Useful for masking operations
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[edit]
scientific
generare tipi in virgola mobile con la notazione scientifica, o la notazione esadecimale se combinato con fisso
Original:
generate floating point types using scientific notation, or hex notation if combined with fixed
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[edit]
fixed
generare tipi in virgola mobile con la notazione fissa, o la notazione esadecimale, se combinata con scientifica
Original:
generate floating point types using fixed notation, or hex notation if combined with scientific
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[edit]
floatfield
scientific|fixed|(scientific|fixed)|0. Utile per mascherare operazioni
Original:
scientific|fixed|(scientific|fixed)|0. Useful for masking operations
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[edit]
boolalpha
inserire ed estrarre tipo bool in formato alfanumerico
Original:
insert and extract bool type in alphanumeric format
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[edit]
showbase
generare un prefisso che indica la base numerica per l'uscita numero intero, richiedono l'indicatore valuta monetaria di I / O
Original:
generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O
The text has been machine-translated via Google Translate.
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[edit]
showpoint
generare un punto decimale carattere incondizionatamente per la virgola mobile il numero di uscita
Original:
generate a decimal-point character unconditionally for floating-point number output
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[edit]
showpos
generare un carattere + per non negativo output numerico
Original:
generate a + character for non-negative numeric output
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[edit]
skipws
saltare gli spazi iniziali prima di operazioni di input specifici
Original:
skip leading whitespace before certain input operations
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[edit]
unitbuf
lavare l'uscita dopo ogni operazione di uscita
Original:
flush the output after each output operation
The text has been machine-translated via Google Translate.
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[edit]
uppercase
sostituire alcune lettere minuscole con le loro uppercase
equivalents in alcune operazioni di uscita di uscita
Original:
replace certain lowercase letters with their uppercase
equivalents in certain output output operations
The text has been machine-translated via Google Translate.
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[edit]
Original:
formatting flags type

The following constants are also defined:

Constant
Original:
Constant
The text has been machine-translated via Google Translate.
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Explanation[edit]
dec
utilizzare base decimale per intero I / O
Original:
use decimal base for integer I/O
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[edit]
oct
utilizzare ottale base per intero di I / O
Original:
use octal base for integer I/O
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[edit]
hex
utilizzare base esadecimale per intero I / O
Original:
use hexadecimal base for integer I/O
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[edit]
basefield
dec|oct|hex|0. Utile per mascherare operazioni
Original:
dec|oct|hex|0. Useful for masking operations
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[edit]
left
regolazione sinistra (aggiunge caratteri di riempimento a destra)
Original:
left adjustment (adds fill characters to the right)
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[edit]
right
giusta regolazione (aggiunge caratteri di riempimento a sinistra)
Original:
right adjustment (adds fill characters to the left)
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[edit]
internal
regolazione interna (aggiunge caratteri di riempimento fino al punto interno designato)
Original:
internal adjustment (adds fill characters to the internal designated point)
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[edit]
adjustfield
left|right|internal. Utile per mascherare operazioni
Original:
left|right|internal. Useful for masking operations
The text has been machine-translated via Google Translate.
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[edit]
scientific
generare tipi in virgola mobile con la notazione scientifica, o la notazione esadecimale se combinato con fisso
Original:
generate floating point types using scientific notation, or hex notation if combined with fixed
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[edit]
fixed
generare tipi in virgola mobile con la notazione fissa, o la notazione esadecimale, se combinata con scientifica
Original:
generate floating point types using fixed notation, or hex notation if combined with scientific
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[edit]
floatfield
scientific|fixed|(scientific|fixed)|0. Utile per mascherare operazioni
Original:
scientific|fixed|(scientific|fixed)|0. Useful for masking operations
The text has been machine-translated via Google Translate.
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[edit]
boolalpha
inserire ed estrarre tipo bool in formato alfanumerico
Original:
insert and extract bool type in alphanumeric format
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[edit]
showbase
generare un prefisso che indica la base numerica per l'uscita numero intero, richiedono l'indicatore valuta monetaria di I / O
Original:
generate a prefix indicating the numeric base for integer output, require the currency indicator in monetary I/O
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[edit]
showpoint
generare un punto decimale carattere incondizionatamente per la virgola mobile il numero di uscita
Original:
generate a decimal-point character unconditionally for floating-point number output
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[edit]
showpos
generare un carattere + per non negativo output numerico
Original:
generate a + character for non-negative numeric output
The text has been machine-translated via Google Translate.
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[edit]
skipws
saltare gli spazi iniziali prima di operazioni di input specifici
Original:
skip leading whitespace before certain input operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[edit]
unitbuf
lavare l'uscita dopo ogni operazione di uscita
Original:
flush the output after each output operation
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[edit]
uppercase
sostituire alcune lettere minuscole con le loro uppercase
equivalents in alcune operazioni di uscita di uscita
Original:
replace certain lowercase letters with their uppercase
equivalents in certain output output operations
The text has been machine-translated via Google Translate.
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[edit]
The text has been machine-translated via Google Translate.
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(typedef) [edit]
stato del tipo di flusso

Le costanti sono anche definiti:

Constant
Original:
Constant
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Explanation[edit]
goodbit
nessun errore
Original:
no error
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[edit]
badbit
flusso di errore irrecuperabile
Original:
irrecoverable stream error
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[edit]
failbit
di input / output non riuscita (errore di formattazione o di estrazione)
Original:
input/output operation failed (formatting or extraction error)
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[edit]
eofbit
sequenza di input associati ha raggiunto la fine del file
Original:
associated input sequence has reached end-of-file
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[edit]
Original:
state of the stream type

The following constants are also defined:

Constant
Original:
Constant
The text has been machine-translated via Google Translate.
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Explanation[edit]
goodbit
nessun errore
Original:
no error
The text has been machine-translated via Google Translate.
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[edit]
badbit
flusso di errore irrecuperabile
Original:
irrecoverable stream error
The text has been machine-translated via Google Translate.
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[edit]
failbit
di input / output non riuscita (errore di formattazione o di estrazione)
Original:
input/output operation failed (formatting or extraction error)
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[edit]
eofbit
sequenza di input associati ha raggiunto la fine del file
Original:
associated input sequence has reached end-of-file
The text has been machine-translated via Google Translate.
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[edit]
The text has been machine-translated via Google Translate.
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(typedef) [edit]
seeking direction type

The following constants are also defined:

Constant
Original:
Constant
The text has been machine-translated via Google Translate.
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Explanation[edit]
beg
l'inizio di un flusso
Original:
the beginning of a stream
The text has been machine-translated via Google Translate.
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[edit]
end
la fine di un corso d'acqua
Original:
the ending of a stream
The text has been machine-translated via Google Translate.
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[edit]
cur
la posizione corrente del flusso di indicatore di posizione
Original:
the current position of stream position indicator
The text has been machine-translated via Google Translate.
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[edit]

(typedef) [edit]
specifica il tipo di evento
Original:
specifies event type
The text has been machine-translated via Google Translate.
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(enum) [edit]
callback tipo di funzione
Original:
callback function type
The text has been machine-translated via Google Translate.
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(typedef) [edit]