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    std::ws

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    < cpp | io | manip

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    <metanoindex/>

     
    C++
     
    D'entrée / sortie de bibliothèque
    I / O manipulateurs
    C-style I / O
    Tampons
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    Buffers
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    basic_streambuf
    basic_filebuf
    basic_stringbuf
    strstreambuf (obsolète)
    Cours d'eau
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    Streams
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    Abstractions
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    Abstractions
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    ios_base
    basic_ios
    basic_istream
    basic_ostream
    basic_iostream
    Fichier E / O
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    File I/O
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    basic_ifstream
    basic_ofstream
    basic_fstream
    Chaîne I / O
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    String I/O
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    basic_istringstream
    basic_ostringstream
    basic_stringstream
    Tableau I / O
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    Array I/O
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    istrstream (obsolète)
    ostrstream (obsolète)
    strstream (obsolète)
    Types
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    Types
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    streamoff
    streamsize
    fpos
    Interface catégorie d'erreur
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    Error category interface
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    iostream_category (C++11)
    io_errc (C++11)
     
    D'entrée / sortie manipulateurs
    À virgule flottante en forme
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    Floating-point formatting
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    Formatage entier
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    Integer formatting
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    Formatage booléen
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    Boolean formatting
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    boolalpha
    noboolalpha
    Largeur de champ et de contrôle de remplissage
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    Field width and fill control
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    Autre mise en forme
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    Other formatting
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    Traitement des espaces blancs
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    Whitespace processing
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    Sortie de rinçage
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    Output flushing
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    Indicateurs d'état manipulation
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    Status flags manipulation
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    Temps et d'argent I / O
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    Time and money I/O
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    get_money (C++11)
    get_time (C++11)
    put_money (C++11)
    put_time (C++11)
     
    <tbody> </tbody>
    Déclaré dans l'en-tête <istream>
    template< class CharT, class Traits > std::basic_istream<CharT,Traits>& ws( std::basic_istream<CharT, Traits>& is );
    Les rejets les espaces au début d'un flux d'entrée .
    Original:
    Discards leading whitespace from an input stream.
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    Se comporte comme un UnformattedInputFunction, sauf que is.gcount() n'est pas modifié. Après la construction et la vérification de l'objet sentinelle, extrait les caractères à partir du flux et les supprime jusqu'à l'une des conditions suivantes est remplie:
    Original:
    Behaves as an UnformattedInputFunction, except that is.gcount() is not modified. After constructing and checking the sentry object, extracts characters from the stream and discards them until any one of the following conditions occurs:
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    • condition de fin de fichier se produit dans la séquence d'entrée (dans ce cas, la fonction appelle setstate(eofbit) mais ne définit pas failbit .
      Original:
      end of file condition occurs in the input sequence (in which case the function calls setstate(eofbit) but does not set failbit.
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    • l'c caractère suivant disponible dans la séquence d'entrée n'est pas déterminé par des espaces, comme std::isspace(c, is.getloc()). Le caractère non-blanc n'est pas extraite .
      Original:
      the next available character c in the input sequence is not whitespace as determined by std::isspace(c, is.getloc()). The non-whitespace character is not extracted.
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    Il s'agit d'un manipulateur d'entrée uniquement d'E / S, il peut être appelé avec une expression telle que pour tout in << std::ws in de type std::basic_istream .
    Original:
    This is an input-only I/O manipulator, it may be called with an expression such as in << std::ws for any in of type std::basic_istream.
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    Paramètres

    is -
    référence aux flux d'entrée
    Original:
    reference to input stream
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    Retourne la valeur

    is (référence au flux après l'extraction des espaces consécutifs)
    Original:
    is (reference to the stream after extraction of consecutive whitespace)
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    Exemple

    #include <iostream>
#include <sstream>
int main()
{
    std::istringstream s("     this is a test");
    std::string line;
    s >> std::ws;
    getline(s, line);
    std::cout << "ws + getline returns: \"" << line << "\"\n";
}

    Résultat : 

    ws + getline returns: "this is a test"

    Voir aussi
    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 de std::basic_istream) [edit]