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std::setw

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< cpp‎ | io‎ | manip

 
 
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Largeur de champ et de contrôle de remplissage
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Field width and fill control
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setw
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Defined in header <iomanip>
/*unspecified*/ setw( int n );
Lorsqu'il est utilisé dans une expression out << setw(n) ou in >> setw(n), définit le paramètre width du flux out ou in exactement n. Cette valeur n'est pas "collant": la prochaine entrée ou de la sortie qui est affectée par la valeur du champ width du ruisseau, il réinitialise à zéro (ce qui signifie "non spécifié") .
Original:
When used in an expression out << setw(n) or in >> setw(n), sets the width parameter of the stream out or in to exactly n. This value is not "sticky": the next input or output operation that is affected by the value of the stream's width field, resets it to zero (meaning "unspecified").
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Sommaire

[modifier] Paramètres

n -
nouvelle valeur pour la largeur
Original:
new value for width
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[modifier] Retourne la valeur

Retourne un objet de type non précisé de sorte que si str est le nom d'un flux de sortie de type std::basic_ostream<CharT, Traits> ou std::basic_istream<CharT, Traits>, alors l'expression str << setw(n) ou str >> setw(n) se comporte comme si le code suivant est exécuté:
Original:
Returns an object of unspecified type such that if str is the name of an output stream of type std::basic_ostream<CharT, Traits> or std::basic_istream<CharT, Traits>, then the expression str << setw(n) or str >> setw(n) behaves as if the following code was executed:
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str.width(n);

[modifier] Exemple

#include <sstream>
#include <iostream>
#include <iomanip>
int main()
{
        std::cout << "no setw: " << 42 << '\n'
                  << "setw(6): " << std::setw(6) << 42 << '\n';
        std::istringstream is("hello, world");
        char arr[10];
        is >> std::setw(6) >> arr;
        std::cout << "Input from \"" << is.str() << "\" with setw(6) gave \"" << arr << "\"\n";
}

Résultat :

no setw: 42
setw(6):     42
Input from "hello, world" with setw(6) gave "hello"

[modifier] Voir aussi

manages field width
(fonction membre publique de std::ios_base) [edit]
modifie le caractère de remplissage
Original:
changes the fill character
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(fonction générique) [edit]