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std::basic_ifstream - cppreference.com

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<tbody> </tbody>

Elemento definito nell'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 istream

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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Definizione nell'header <fstream>

Tipo

Original:

Type

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 Definition
ifstream basic_ifstream<char>
wifstream basic_ifstream<wchar_t>

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]

Membri funzioni

costruisce il flusso di file

Original:

constructs the file stream

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(metodo pubblico) [modifica]

(destructor)

[virtuale] (dichiarato in modo implicito)

 destructs the basic_ifstream and the associated buffer, closes the file
(metodo pubblico virtuale) [modifica]

(C++11)

sposta il flusso di file

Original:

moves the file stream

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(metodo pubblico) [modifica]

(C++11)

Scambia due flussi di file

Original:

swaps two file streams

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(metodo pubblico) [modifica]

restituisce l'oggetto sottostante raw file di dispositivo

Original:

returns the underlying raw file device object

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(metodo pubblico) [modifica]

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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(metodo pubblico) [modifica]

apre un file e lo associa con il flusso

Original:

opens a file and associates it with the stream

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(metodo pubblico) [modifica]

chiude il file associato

Original:

closes the associated file

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(metodo pubblico) [modifica]

Non membri funzioni

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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(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]

Member classes

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

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

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[modifica]
floatfield

scientific|fixed|(scientific|fixed)|0. Utile per mascherare operazioni

Original:

scientific|fixed|(scientific|fixed)|0. Useful for masking operations

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[modifica]
boolalpha

inserire ed estrarre tipo bool in formato alfanumerico

Original:

insert and extract bool type in alphanumeric format

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[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

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[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

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[modifica]
showpos

generare un carattere + per non negativo output numerico

Original:

generate a + character for non-negative numeric output

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[modifica]
skipws

saltare gli spazi iniziali prima di operazioni di input specifici

Original:

skip leading whitespace before certain input operations

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[modifica]
unitbuf

lavare l'uscita dopo ogni operazione di uscita

Original:

flush the output after each output operation

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[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

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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

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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

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[modifica]
floatfield

scientific|fixed|(scientific|fixed)|0. Utile per mascherare operazioni

Original:

scientific|fixed|(scientific|fixed)|0. Useful for masking operations

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[modifica]
boolalpha

inserire ed estrarre tipo bool in formato alfanumerico

Original:

insert and extract bool type in alphanumeric format

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[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

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[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

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[modifica]
showpos

generare un carattere + per non negativo output numerico

Original:

generate a + character for non-negative numeric output

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[modifica]
skipws

saltare gli spazi iniziali prima di operazioni di input specifici

Original:

skip leading whitespace before certain input operations

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[modifica]
unitbuf

lavare l'uscita dopo ogni operazione di uscita

Original:

flush the output after each output operation

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[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

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[modifica]

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(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

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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

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[modifica]

Original:

state of the stream type

The following constants are also defined:

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

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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

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[modifica]

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(typedef) [modifica]
seeking direction type

The following constants are also defined:

Constant

Original:

Constant

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 Explanation[modifica]
beg

l'inizio di un flusso

Original:

the beginning of a stream

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[modifica]
end

la fine di un corso d'acqua

Original:

the ending of a stream

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[modifica]
cur

la posizione corrente del flusso di indicatore di posizione

Original:

the current position of stream position indicator

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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

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(typedef) [modifica]