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      std::ws

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      < cpp‎ | io‎ | manip

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      C++
       
      D'entrée / sortie de bibliothèque
      I / O manipulateurs
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      Other formatting
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      Traitement des espaces blancs
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      Whitespace processing
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      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 .
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        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::wsin 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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      Sommaire

      [modifier]Paramètres

      is -
      référence aux flux d'entrée
      Original:
      reference to input stream
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      [modifier]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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      [modifier]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"

      [modifier]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]
      Récupérée de « https://fr.cppreference.com/mwiki/index.php?title=cpp/io/manip/ws&oldid=48429 »
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