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std::basic_istream

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C++
 
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)
 
Elemento definito nell'header <istream>
template<

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

> class basic_istream : virtual public std::basic_ios<CharT, Traits>
Il basic_istream modello di classe fornisce il supporto per le operazioni di alto livello di ingresso su flussi di caratteri. Le operazioni supportate comprendono ingresso formattato (ad esempio, valori interi separati da spazi bianchi o caratteri e le stringhe di caratteri) e l'ingresso non formattato (ad esempio, caratteri prime e array di caratteri). Questa funzionalità è implementata in termini di interfaccia fornita dalla classe basic_streambuf sottostante, accessibile attraverso la classe base basic_ios. L'unico non-ereditata membro dati di basic_istream, nella maggior parte delle implementazioni, è il valore restituito da basic_istream::gcount().
Original:
The class template basic_istream provides support for high level input operations on character streams. The supported operations include formatted input (e.g. integer values or whitespace-separated characters and characters strings) and unformatted input (e.g. raw characters and character arrays). This functionality is implemented in terms of the interface provided by the underlying basic_streambuf class, accessed through the basic_ios base class. The only non-inherited data member of basic_istream, in most implementations, is the value returned by basic_istream::gcount().
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cpp/io/ios basecpp/io/basic iosstd-basic istream-inheritance.svg
Informazioni sull'immagine

Inheritance diagram

Due specializzazioni per i tipi di caratteri comuni sono definiti:
Original:
Two specializations for common character types are defined:
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Definizione nell'header <istream>
Tipo
Original:
Type
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 Definition
istream basic_istream<char>
wistream basic_istream<wchar_t>

Indice

[modifica] Gli oggetti globali

Due oggetti globali basic_istream sono fornite dalla libreria standard.
Original:
Two global basic_istream objects are provided by the standard library.
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Definizione nell'header <iostream>
legge dal flusso di input standard di C stdin
(oggetto globale)
Original:
reads from the standard C input stream stdin
(oggetto globale)
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[modifica]

[modifica] Membri tipi

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

[modifica] Membri funzioni
Costruisce l'oggetto
Original:
constructs the object
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(metodo pubblico) [modifica]
[virtuale]
distrugge l'oggetto
Original:
destructs the object
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(metodo pubblico virtuale) [modifica]
(C++11)
sostituisce l'oggetto buffer
Original:
replaces the buffer object
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(protetto funzione membro) [modifica]
Ingresso formattato
Original:
Formatted input
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estratti i dati formattati
Original:
extracts formatted data
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(metodo pubblico) [modifica]
Ingresso non formattato
Original:
Unformatted input
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estratti di caratteri
Original:
extracts characters
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(metodo pubblico) [modifica]
legge il carattere successivo senza estrarlo
Original:
reads the next character without extracting it
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(metodo pubblico) [modifica]
unextracts un carattere
Original:
unextracts a character
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(metodo pubblico) [modifica]
mette carattere nel flusso di input
Original:
puts character into input stream
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(metodo pubblico) [modifica]
caratteri estratti fino a quando il carattere dato è stato trovato
Original:
extracts characters until the given character is found
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(metodo pubblico) [modifica]
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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(metodo pubblico) [modifica]
estrae blocchi di caratteri
Original:
extracts blocks of characters
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(metodo pubblico) [modifica]
estrae blocchi già disponibili di caratteri
Original:
extracts already available blocks of characters
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(metodo pubblico) [modifica]
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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(metodo pubblico) [modifica]
Posizionamento
Original:
Positioning
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restituisce l'indicatore di posizione di ingresso
Original:
returns the input position indicator
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(metodo pubblico) [modifica]
sets the input position indicator
(metodo pubblico) [modifica]
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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(metodo pubblico) [modifica]
(C++11)
oggetti flusso swap, ad eccezione per il buffer associato
Original:
swaps stream objects, except for the associated buffer
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(protetto funzione membro) [modifica]

[modifica] Membri classi

 implements basic logic for preparation of the stream for input operations
(membro pubblico classe) [modifica]

[modifica] Non membri funzioni
estrae i caratteri e array di caratteri
Original:
extracts characters and character arrays
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(funzione di modello) [modifica]

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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(metodo pubblico) [modifica]
controlli se end-of-file è stato raggiunto
Original:
checks if end-of-file has been reached
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(metodo pubblico) [modifica]
Verifica se un errore recuperabile è verificato
Original:
checks if a recoverable error has occurred
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(metodo pubblico) [modifica]
Verifica se un errore non recuperabile è verificato
Original:
checks if a non-recoverable error has occurred
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(metodo pubblico) [modifica]
controlla se è verificato un errore (sinonimo di fail())
Original:
checks if an error has occurred (synonym of fail())
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(metodo pubblico) [modifica]
(fino al c++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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(metodo pubblico) [modifica]
restituisce flag di stato
Original:
returns state flags
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(metodo pubblico) [modifica]
imposta i flag di stato
Original:
sets state flags
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(metodo pubblico) [modifica]
cancella flag di errore e eof
Original:
clears error and eof flags
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(metodo pubblico) [modifica]
Formattazione
Original:
Formatting
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copie informazioni di formattazione
Original:
copies formatting information
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(metodo pubblico) [modifica]
gestisce il carattere di riempimento
Original:
manages the fill character
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(metodo pubblico) [modifica]
Varie
Original:
Miscellaneous
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 manages exception mask
(metodo pubblico) [modifica]
imposta il locale
Original:
sets the locale
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(metodo pubblico) [modifica]
gestisce buffer del flusso associato
Original:
manages associated stream buffer
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(metodo pubblico) [modifica]
gestisce flusso legato
Original:
manages tied stream
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(metodo pubblico) [modifica]
restringe caratteri
Original:
narrows characters
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(metodo pubblico) [modifica]
widens characters
(metodo pubblico) [modifica]

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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(metodo pubblico) [modifica]
imposta flag specifico formato
Original:
sets specific format flag
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(metodo pubblico) [modifica]
clears specific format flag
(metodo pubblico) [modifica]
gestisce la precisione decimale di operazioni in virgola mobile
Original:
manages decimal precision of floating point operations
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(metodo pubblico) [modifica]
manages field width
(metodo pubblico) [modifica]
Versioni locali
Original:
Locales
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imposta locale
Original:
sets locale
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(metodo pubblico) [modifica]
restituisce locale corrente
Original:
returns current locale
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(metodo pubblico) [modifica]
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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(metodo pubblico statico) [modifica]
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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(metodo pubblico) [modifica]
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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(metodo pubblico) [modifica]
Varie
Original:
Miscellaneous
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 registers event callback function
(metodo pubblico) [modifica]
[statico]
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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(metodo pubblico statico) [modifica]
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) [modifica]
inizializza oggetti stream standard
Original:
initializes standard stream objects
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(membro pubblico of std::ios_base classe) [modifica]

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

The following constants are also defined:

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

Le costanti sono anche definiti:

Constant
Original:
Constant
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 Explanation[modifica]
dec
utilizzare base decimale per intero I / O
Original:
use decimal base for integer I/O
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[modifica]
oct
utilizzare ottale base per intero di I / O
Original:
use octal base for integer I/O
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[modifica]
hex
utilizzare base esadecimale per intero I / O
Original:
use hexadecimal base for integer I/O
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[modifica]
basefield
dec|oct|hex|0. Utile per mascherare operazioni
Original:
dec|oct|hex|0. Useful for masking operations
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[modifica]
left
regolazione sinistra (aggiunge caratteri di riempimento a destra)
Original:
left adjustment (adds fill characters to the right)
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[modifica]
right
giusta regolazione (aggiunge caratteri di riempimento a sinistra)
Original:
right adjustment (adds fill characters to the left)
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[modifica]
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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[modifica]
adjustfield
left|right|internal. Utile per mascherare operazioni
Original:
left|right|internal. Useful for masking operations
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[modifica]
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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[modifica]
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
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
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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[modifica]
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.
[modifica]
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.
[modifica]
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.
[modifica]
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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[modifica]
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.
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[modifica]
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.
[modifica]
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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[modifica]
Original:
formatting flags type

The following constants are also defined:

Constant
Original:
Constant
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 Explanation[modifica]
dec
utilizzare base decimale per intero I / O
Original:
use decimal base for integer I/O
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[modifica]
oct
utilizzare ottale base per intero di I / O
Original:
use octal base for integer I/O
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[modifica]
hex
utilizzare base esadecimale per intero I / O
Original:
use hexadecimal base for integer I/O
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[modifica]
basefield
dec|oct|hex|0. Utile per mascherare operazioni
Original:
dec|oct|hex|0. Useful for masking operations
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[modifica]
left
regolazione sinistra (aggiunge caratteri di riempimento a destra)
Original:
left adjustment (adds fill characters to the right)
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[modifica]
right
giusta regolazione (aggiunge caratteri di riempimento a sinistra)
Original:
right adjustment (adds fill characters to the left)
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[modifica]
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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[modifica]
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.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
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
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
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
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
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.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
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.
[modifica]
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.
[modifica]
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.
[modifica]
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.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
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.
[modifica]
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.
[modifica]
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.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(typedef) [modifica]
stato del tipo di flusso

Le costanti sono anche definiti:

Constant
Original:
Constant
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 Explanation[modifica]
goodbit
nessun errore
Original:
no error
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[modifica]
badbit
flusso di errore irrecuperabile
Original:
irrecoverable stream error
The text has been machine-translated via Google Translate.
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[modifica]
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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[modifica]
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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[modifica]
Original:
state of the stream type

The following constants are also defined:

Constant
Original:
Constant
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 Explanation[modifica]
goodbit
nessun errore
Original:
no error
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
badbit
flusso di errore irrecuperabile
Original:
irrecoverable stream error
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
failbit
di input / output non riuscita (errore di formattazione o di estrazione)
Original:
input/output operation failed (formatting or extraction error)
The text has been machine-translated via Google Translate.
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[modifica]
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.
You can help to correct and verify the translation. Click here for instructions.
[modifica]
The text has been machine-translated via Google Translate.
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(typedef) [modifica]
seeking direction type

The following constants are also defined:

Constant
Original:
Constant
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
 Explanation[modifica]
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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[modifica]
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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[modifica]
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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[modifica]

(typedef) [modifica]
specifica il tipo di evento
Original:
specifies event type
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(enum) [modifica]
callback tipo di funzione
Original:
callback function type
The text has been machine-translated via Google Translate.
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(typedef) [modifica]
Estratto da "https://it.cppreference.com/mwiki/index.php?title=cpp/io/basic_istream&oldid=27321"