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Déclaré dans l'en-tête

<istream>

template< class CharT, class Traits = std::char_traits<CharT> > class basic_istream : virtual public std::basic_ios<CharT, Traits>

Le modèle de classe basic_istream fournit un support pour les opérations d'entrée haute niveau sur les flux de caractères. Les opérations prises en charge comprennent l'entrée formatée (par exemple des valeurs entières ou séparés par des espaces et des chaînes de caractères des personnages) et l'entrée non formatée (par exemple, des caractères bruts et des tableaux de caractères). Cette fonctionnalité est implémentée en termes d'interface fournie par la classe basic_streambuf sous-jacente, accessibles via la classe de base basic_ios. Le seul non-membre de données héritée de basic_istream, dans la plupart des implémentations, est la valeur retournée par

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 ios

Inheritance diagram

Deux spécialisations pour les types de caractères communs sont définis:

Original:

Two specializations for common character types are defined:

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Defined in header <istream>

Type d'

Original:

Type

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 Definition
istream basic_istream<char>
wistream basic_istream<wchar_t>

Les objets globaux

Deux objets globaux basic_istream sont fournis par la bibliothèque standard .

Original:

Two global basic_istream objects are provided by the standard library.

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Defined in header <iostream>

lit le flux d'entrée standard C stdin
(

objet global

Original:

global object

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)

Original:

reads from the standard C input stream stdin
(

objet global

Original:

global object

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)

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[edit]

Types de membres

Type du membre Définition
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]

Fonctions membres

Construit l'objet

Original:

constructs the object

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(fonction membre publique) [edit]

[

virtuel

Original:

virtual

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]

Détruit l'objet

Original:

destructs the object

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(function membre virtuelle publique) [edit]

(C++11)

remplace l'objet tampon

Original:

replaces the buffer object

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(fonction membre protégée) [edit]

Entrée formaté

Original:

Formatted input

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extraits des données formatées

Original:

extracts formatted data

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(fonction membre publique) [edit]

Entrée non formaté

Original:

Unformatted input

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extraits caractères

Original:

extracts characters

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(fonction membre publique) [edit]

lit le caractère suivant sans l'extraire

Original:

reads the next character without extracting it

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(fonction membre publique) [edit]

unextracts un caractère

Original:

unextracts a character

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(fonction membre publique) [edit]

met caractère dans le flux d'entrée

Original:

puts character into input stream

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(fonction membre publique) [edit]

caractères extraits jusqu'à ce que le caractère donné se trouve

Original:

extracts characters until the given character is found

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(fonction membre publique) [edit]

extraits et rejets des caractères jusqu'à ce que le caractère donné soit trouvé

Original:

extracts and discards characters until the given character is found

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(fonction membre publique) [edit]

extrait des blocs de caractères

Original:

extracts blocks of characters

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(fonction membre publique) [edit]

extrait des blocs déjà disponibles de caractères

Original:

extracts already available blocks of characters

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(fonction membre publique) [edit]

Retourne le nombre de caractères extraits par l'opération dernière entrée non formaté

Original:

returns number of characters extracted by last unformatted input operation

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(fonction membre publique) [edit]

Positionnement

Original:

Positioning

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renvoie l'indicateur de position d'entrée

Original:

returns the input position indicator

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(fonction membre publique) [edit]
sets the input position indicator
(fonction membre publique) [edit]

Divers

Original:

Miscellaneous

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synchronise avec le dispositif de stockage sous-jacent

Original:

synchronizes with the underlying storage device

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(fonction membre publique) [edit]

(C++11)

objets swaps de cours d'eau, sauf pour le tampon associé

Original:

swaps stream objects, except for the associated buffer

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(fonction membre protégée) [edit]

Classes de membres

met en oeuvre la logique de base pour la préparation du courant pour des opérations d'entrée

Original:

implements basic logic for preparation of the stream for input operations

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(classe membre publique) [edit]

Fonctions annexes

extrait des tableaux de caractères et de caractères

Original:

extracts characters and character arrays

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(fonction générique) [edit]

Inherited from std::basic_ios

Member types

Type du membre Définition
char_type CharT
traits_type Traits
int_type Traits::int_type
pos_type Traits::pos_type
off_type Traits::off_type

Fonctions de l'État

Original:

State functions

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vérifie si aucune erreur n'est survenue dire opérations E / S sont disponibles

Original:

checks if no error has occurred i.e. I/O operations are available

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(fonction membre publique de std::basic_ios) [edit]

vérifie si fin de fichier a été atteinte

Original:

checks if end-of-file has been reached

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(fonction membre publique de std::basic_ios) [edit]

vérifie si une erreur irrécupérable s'est produite

Original:

checks if a recoverable error has occurred

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(fonction membre publique de std::basic_ios) [edit]

vérifie si une erreur irrécupérable s'est produite

Original:

checks if a non-recoverable error has occurred

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(fonction membre publique de std::basic_ios) [edit]

vérifie si une erreur s'est produite (synonyme de

fail()

)

Original:

checks if an error has occurred (synonym of

fail()

)

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(fonction membre publique de std::basic_ios) [edit]

(avant C++11)
(depuis C++11)

vérifie si aucune erreur ne s'est produite (synonyme de !fail())

Original:

checks if no error has occurred (synonym of !fail())

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(fonction membre publique de std::basic_ios) [edit]

retourne drapeaux nationaux

Original:

returns state flags

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(fonction membre publique de std::basic_ios) [edit]

définit des indicateurs d'état

Original:

sets state flags

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(fonction membre publique de std::basic_ios) [edit]

efface les indicateurs d'erreur et eof

Original:

clears error and eof flags

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(fonction membre publique de std::basic_ios) [edit]

Mise en forme

Original:

Formatting

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copies de formater l'information

Original:

copies formatting information

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(fonction membre publique de std::basic_ios) [edit]

gère le caractère de remplissage

Original:

manages the fill character

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(fonction membre publique de std::basic_ios) [edit]

Divers

Original:

Miscellaneous

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gère masque d'exception

Original:

manages exception mask

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(fonction membre publique de std::basic_ios) [edit]

définit les paramètres régionaux

Original:

sets the locale

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(fonction membre publique de std::basic_ios) [edit]

gère tampon de flux associé

Original:

manages associated stream buffer

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(fonction membre publique de std::basic_ios) [edit]

gère flux liés

Original:

manages tied stream

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(fonction membre publique de std::basic_ios) [edit]

rétrécit caractères

Original:

narrows characters

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(fonction membre publique de std::basic_ios) [edit]
widens characters
(fonction membre publique de std::basic_ios) [edit]

Inherited from std::ios_base

Member functions

Mise en forme

Original:

Formatting

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gère indicateurs de format

Original:

manages format flags

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(fonction membre publique de std::ios_base) [edit]

active l'indicateur de format spécifique

Original:

sets specific format flag

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(fonction membre publique de std::ios_base) [edit]
clears specific format flag
(fonction membre publique de std::ios_base) [edit]

gère précision décimale des opérations en virgule flottante

Original:

manages decimal precision of floating point operations

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(fonction membre publique de std::ios_base) [edit]
manages field width
(fonction membre publique de std::ios_base) [edit]

Locales

Original:

Locales

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fixe locale

Original:

sets locale

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(fonction membre publique de std::ios_base) [edit]

retourne localisation en cours

Original:

returns current locale

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(fonction membre publique de std::ios_base) [edit]

Interne gamme extensible

Original:

Internal extensible array

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[

statique

Original:

static

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]

renvoie un entier ensemble du programme unique qui est sûr à utiliser comme indice de motpasse () et iword ()

Original:

returns a program-wide unique integer that is safe to use as index to pword() and iword()

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(fonction membre publique statique de std::ios_base) [edit]

redimensionne le stockage privé et le cas échéant un accès à l'élément de long à l'index donné

Original:

resizes the private storage if necessary and access to the long element at the given index

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(fonction membre publique de std::ios_base) [edit]

redimensionne le stockage privé et le cas échéant un accès à l'élément de void* à l'index donné

Original:

resizes the private storage if necessary and access to the void* element at the given index

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(fonction membre publique de std::ios_base) [edit]

Divers

Original:

Miscellaneous

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enregistre fonction de rappel d'événement

Original:

registers event callback function

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(fonction membre publique de std::ios_base) [edit]

[

statique

Original:

static

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]

définit si le C + + et C des bibliothèques d'entrées-sorties sont interopérables

Original:

sets whether C++ and C IO libraries are interoperable

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(fonction membre publique statique de std::ios_base) [edit]

Classes de membres

Original:

Member classes

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exception ruisseau

Original:

stream exception

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(classe membre publique de std::ios_base) [edit]

initialise les objets de flux standard

Original:

initializes standard stream objects

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(classe membre publique de std::ios_base) [edit]

Types de membres et de constantes

Original:

Member types and constants

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Type d'

Original:

Type

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 Explanation

type de mode de flux ouvert Les constantes suivantes sont également définis:

Original:

stream open mode type The following constants are also defined:

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Constante

Original:

Constant

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 Explanation[edit]
app

demander à l'extrémité du flux avant chaque écriture

Original:

seek to the end of stream before each write

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[edit]
binary

ouvrir en mode binaire

Original:

open in binary mode

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[edit]
in

ouvrir en lecture

Original:

open for reading

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[edit]
out

ouvrir en écriture

Original:

open for writing

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[edit]
trunc

jeter le contenu du courant lors de l'ouverture

Original:

discard the contents of the stream when opening

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[edit]
ate

demander à l'extrémité du flux immédiatement après ouverture

Original:

seek to the end of stream immediately after open

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[edit]

(typedef) [edit]

la mise en forme des drapeaux de type Les constantes suivantes sont également définis:

Original:

formatting flags type The following constants are also defined:

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Constante

Original:

Constant

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 Explanation[edit]
dec

utiliser la base décimale pour l'entier I / O

Original:

use decimal base for integer I/O

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[edit]
oct

utiliser octal de base pour l'entier I / O

Original:

use octal base for integer I/O

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[edit]
hex

utiliser la base hexadécimale entier I / O

Original:

use hexadecimal base for integer I/O

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[edit]
basefield

dec|oct|hex|0. Utile pour masquer les opérations

Original:

dec|oct|hex|0. Useful for masking operations

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[edit]
left

réglage gauche (ajoute des caractères de remplissage à droite)

Original:

left adjustment (adds fill characters to the right)

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[edit]
right

réglage de droite (ajoute des caractères de remplissage à gauche)

Original:

right adjustment (adds fill characters to the left)

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[edit]
internal

ajustement interne (ajoute des caractères de remplissage au point interne désignée)

Original:

internal adjustment (adds fill characters to the internal designated point)

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[edit]
adjustfield

left|right|internal. Utile pour masquer les opérations

Original:

left|right|internal. Useful for masking operations

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[edit]
scientific

générer des types virgule flottante en utilisant la notation scientifique, ou une notation hexadécimale s'il est combiné avec fixe

Original:

generate floating point types using scientific notation, or hex notation if combined with fixed

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[edit]
fixed

générer des types virgule flottante en utilisant la notation fixe ou notation hexadécimale si elle est combinée avec les scientifiques

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 pour masquer les opérations

Original:

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

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[edit]
boolalpha

insérer et d'extraire de type bool au format alphanumérique

Original:

insert and extract bool type in alphanumeric format

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[edit]
showbase

générer un préfixe indiquant la base numérique pour la sortie de nombre entier, nécessitent l'indicateur monnaie monétaire 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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[edit]
showpoint

générer un caractère point décimal sans condition pour la sortie de nombre à virgule flottante

Original:

generate a decimal-point character unconditionally for floating-point number output

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[edit]
showpos

générer un caractère + pour les non-négative de sortie numérique

Original:

generate a + character for non-negative numeric output

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[edit]
skipws

sauter espaces en tête avant les opérations d'entrée de certains

Original:

skip leading whitespace before certain input operations

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[edit]
unitbuf

rincer la sortie après chaque opération de sortie

Original:

flush the output after each output operation

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[edit]
uppercase

remplacer certaines lettres minuscules avec leurs uppercase
equivalents dans certaines opérations de sortie de sortie

Original:

replace certain lowercase letters with their uppercase
equivalents in certain output output operations

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[edit]

(typedef) [edit]

état du type de flux Les constantes suivantes sont également définis:

Original:

state of the stream type The following constants are also defined:

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Constante

Original:

Constant

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 Explanation[edit]
goodbit

pas d'erreur

Original:

no error

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[edit]
badbit

erreur de flux irrécupérables

Original:

irrecoverable stream error

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[edit]
failbit

d'entrée / sortie de l'opération a échoué (erreur de formatage ou d'extraction)

Original:

input/output operation failed (formatting or extraction error)

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[edit]
eofbit

séquence d'entrée associé a atteint la fin de fichier

Original:

associated input sequence has reached end-of-file

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[edit]

(typedef) [edit]

cherchant type de direction Les constantes suivantes sont également définis:

Original:

seeking direction type The following constants are also defined:

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Constante

Original:

Constant

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 Explanation[edit]
beg

le début d'un flux

Original:

the beginning of a stream

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[edit]
end

la fin d'un cours d'eau

Original:

the ending of a stream

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[edit]
cur

la position actuelle de l'indicateur de position courant

Original:

the current position of stream position indicator

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[edit]

(typedef) [edit]

spécifie le type d'événement

Original:

specifies event type

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(enum) [edit]

callback type de fonction

Original:

callback function type

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(typedef) [edit]