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    operator>><div class="t-tr-text">(Std :: basic_istream)<div class="t-tr-dropdown"><div><div><div class="t-tr-dropdown-arrow-border"></div><div class="t-tr-dropdown-arrow"></div><div class="t-tr-dropdown-h">Original:</div><div class="t-tr-dropdown-orig">(std::basic_istream)</div><div class="t-tr-dropdown-notes">The text has been machine-translated via [http://translate.google.com Google Translate].<br/> You can help to correct and verify the translation. Click [http://en.cppreference.com/w/Cppreference:MachineTranslations here] for instructions.</div></div></div></div></div>

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    This page has been machine-translated from the English version of the wiki using Google Translate.

    The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

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    <metanoindex/>

     
    C++
     
    D'entrée / sortie de bibliothèque
    I / O manipulateurs
    C-style I / O
    Tampons
    Original:
    Buffers
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    basic_streambuf
    basic_filebuf
    basic_stringbuf
    strstreambuf (obsolète)
    Cours d'eau
    Original:
    Streams
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    Abstractions
    Original:
    Abstractions
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    ios_base
    basic_ios
    basic_istream
    basic_ostream
    basic_iostream
    Fichier E / O
    Original:
    File I/O
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    basic_ifstream
    basic_ofstream
    basic_fstream
    Chaîne I / O
    Original:
    String I/O
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    basic_istringstream
    basic_ostringstream
    basic_stringstream
    Tableau I / O
    Original:
    Array I/O
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    istrstream (obsolète)
    ostrstream (obsolète)
    strstream (obsolète)
    Types
    Original:
    Types
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    streamoff
    streamsize
    fpos
    Interface catégorie d'erreur
    Original:
    Error category interface
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    iostream_category (C++11)
    io_errc (C++11)
     
    std::basic_istream
    Les objets globaux
    Original:
    Global objects
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    cin
    wcin
    Les fonctions membres
    Original:
    Member functions
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    basic_istream::basic_istream
    basic_istream::~basic_istream
    basic_istream::operator= (C++11)
    Entrée formaté
    Original:
    Formatted input
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    basic_istream::operator>>
    Entrée non formaté
    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
    Positionnement
    Original:
    Positioning
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    basic_istream::tellg
    basic_istream::seekg
    Divers
    Original:
    Miscellaneous
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    basic_istream::sync
    basic_istream::swap (C++11)
    Classes de membres
    Original:
    Member classes
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    basic_istream::sentry
    Tiers fonctions
    Original:
    Non-member functions
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    operator>>(std::basic_istream)
     
    <tbody> </tbody>
    template< class CharT, class Traits > basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>& st, CharT& ch ); template< class Traits > basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, signed char& ch ); template< class Traits > basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, unsigned char& ch );
    		 (1)
    template< class CharT, class Traits> basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>& st, CharT* s ); template< class Traits > basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, signed char* s ); template< class Traits > basic_istream<char,Traits>& operator>>( basic_istream<char,Traits>& st, unsigned char* s );
    		 (2)
    template< class CharT, class Traits, class T > basic_istream<CharT,Traits>& operator>>( basic_istream<CharT,Traits>&& st, T& value );
    		 (3) (depuis C++11)
    Effectue des opérations de saisie de caractères .
    Original:
    Performs character input operations.
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    1)

    Extraits d'un caractère et la stocke dans ch .
    Original:
    Extracts a character and stores it to ch.
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    2)

    Extraits de caractères successifs et les stocke dans des lieux successifs d'un tableau de caractères dont le premier élément est pointé par s. L'extraction s'arrête lorsque l'une des conditions suivantes sont respectées:
    Original:
    Extracts successive characters and stores them at successive locations of a character array whose first element is pointed to by s. The extraction stops if one of the following conditions are met:
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    • un caractère d'espacement (tel que déterminé par la facette ctype<CharT>) est trouvée. Le caractère blanc n'est pas extraite .
      Original:
      a whitespace character (as determined by the ctype<CharT> facet) is found. The whitespace character is not extracted.
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    • this->width() - 1 caractères sont extraits
      Original:
      this->width() - 1 characters are extracted
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    Dans les deux cas, un caractère null supplémentaire CharT() valeur est stockée à la fin de la sortie .
    Original:
    In either case, an additional null character value CharT() is stored at the end of the output.
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    3)

    Appelle l'opérateur d'extraction approprié, compte tenu d'une référence rvalue à un objet flux d'entrée (équivalent à st >> value) .
    Original:
    Calls the appropriate extraction operator, given an rvalue reference to an input stream object (equivalent to st >> value).
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    Notes

    Les versions (1-2) de l'opérateur se comporte comme' fonctions d'entrée formatées. Autrement dit, ils construisent un objet sentry au début que les bouffées de la cravate () 'd tampons si nécessaire, vérifie les erreurs et les extraits et les rejets tous les protagonistes blancs à moins que le drapeau ios_base :: skipws a été effacé. L'entrée est tentée uniquement si l'objet sentry retourne true .
    Original:
    The (1-2) versions of the operator behave as formatted input functions. That is, they construct a sentry object at the beginning that flushes the tie()'d buffers if needed, checks for errors, and extracts and discards all leading whitespace characters unless the ios_base::skipws flag was cleared. The input is attempted only if the sentry object returns true.
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    Paramètres

    st -
    flux d'entrée pour extraire les données à partir de
    Original:
    input stream to extract the data from
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    ch -
    une référence à un caractère pour stocker le caractère extrait
    Original:
    reference to a character to store the extracted character to
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    s -
    pointeur vers une chaîne de caractères pour stocker les caractères extraits d'
    Original:
    pointer to a character string to store the extracted characters to
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    Retourne la valeur

    st

    Exemple

    #include <iostream>
#include <iomanip>
#include <sstream>

int main()
{
    std::string input = "n greetings";
    std::istringstream stream(input);
    char c;
    const int MAX = 6;
    char cstr[MAX];

    stream >> c >> std::setw(MAX) >> cstr;
    std::cout << "c = " << c << '\n'
              << "cstr = " << cstr << '\n';

    double f;
    std::istringstream("1.23") >> f; // rvalue stream extraction
    std::cout << "f = " << f << '\n';
}

    Résultat : 

    c = n
cstr = greet
f = 1.23

    Voir aussi
    extraits des données formatées
    Original:
    extracts formatted data
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    (fonction membre publique) [edit]