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std::setbase

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I / O manipulateurs
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Buffers
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basic_streambuf
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Error category interface
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iostream_category (C++11)
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D'entrée / sortie manipulateurs
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Formatage entier
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Integer formatting
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boolalpha
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Defined in header <iomanip>
/*unspecified*/ setbase( int base );
Lorsqu'ils sont utilisés dans une expression ou out << setbase(base) in >> setbase(base), change le drapeau basefield du courant out ou in, en fonction de la valeur de base: la valeur 16 ensembles basefield à std::ios_base::hex, la valeur 8 ensembles std::ios_base::oct, la valeur 10 ensembles std::ios_base::dec .
Original:
When used in an expression out << setbase(base) or in >> setbase(base), changes the basefield flag of the stream out or in, depending on the value of base: the value 16 sets basefield to std::ios_base::hex, the value 8 sets std::ios_base::oct, the value 10 sets std::ios_base::dec.
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Les valeurs de base autre que 8, 10, ou 16 basefield remis à zéro, ce qui correspond à la sortie décimal et le préfixe dépendante d'entrée .
Original:
Values of base other than 8, 10, or 16 reset basefield to zero, which corresponds to decimal output and prefix-dependent input.
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Sommaire

[modifier] Paramètres

base -
nouvelle valeur pour BASEFIELD
Original:
new value for basefield
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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 << setbase(base) ou str >> setbase(base) 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 << setbase(base) or str >> setbase(base) behaves as if the following code was executed:
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str.setf(base ==  8 ? std::ios_base::oct :
            base == 10 ? std::ios_base::dec :
                base == 16 ? std::ios_base::hex :
                     std::ios_base::fmtflags(0),
         std::ios_base::basefield);

[modifier] Exemple

#include <iostream>
#include <sstream>
#include <iomanip>
int main()
{
    std::cout << "Parsing string \"10 0x10 010\"\n";
 
    int n1, n2, n3;
    std::istringstream s("10 0x10 010");
    s >> std::setbase(16) >> n1 >> n2 >> n3;
    std::cout << "hexadecimal parse: " << n1 << ' ' << n2 << ' ' << n3 << '\n';
 
    s.clear();
    s.seekg(0);
    s >> std::setbase(0) >> n1 >> n2 >> n3;
    std::cout << "prefix-dependent parse: " << n1 << ' ' << n2 << ' ' << n3 << '\n';
 
    std::cout << "hex output: " << std::setbase(16)
              << std::showbase << n1 << ' ' << n2 << ' ' << n3 << '\n';
}

Résultat :

Parsing string "10 0x10 010"
hexadecimal parse: 16 16 16
prefix-dependent parse: 10 16 8
hex output: 0xa 0x10 0x8

[modifier] Voir aussi

modifie la base utilisée pour l'entier I / O
Original:
changes the base used for integer I/O
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(fonction) [edit]
contrôle si le préfixe est utilisé pour indiquer base numérique
Original:
controls whether prefix is used to indicate numeric base
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(fonction) [edit]