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std::has_facet

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< cpp‎ | locale

 
 
Bibliothèque localisations
Locales et facettes
Original:
Locales and facets
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locale
has_facet
Classification des caractères
Original:
Character classification
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Conversions
Original:
Conversions
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Classes de facettes catégorie de base
Original:
Facet category base classes
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Catégories de facettes
Original:
Facet categories
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Spécifique aux paramètres régionaux facettes
Original:
Locale-specific facets
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Facettes de conversion de code
Original:
Code conversion facets
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codecvt_utf8 (C++11)
codecvt_utf16 (C++11)
C locale
Original:
C locale
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Defined in header <locale>
template< class Facet >
bool has_facet( const locale& loc );
Vérifie si le loc locale met en œuvre le Facet facette .
Original:
Checks if the locale loc implements the facet Facet.
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Sommaire

[modifier] Paramètres

loc -
l'objet locale à interroger
Original:
the locale object to query
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[modifier] Retourne la valeur

Retours true si le Facet facette a été installé dans la localisation loc, false autrement .
Original:
Returns true if the facet Facet was installed in the locale loc, false otherwise.
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[modifier] Spécification d'exception

noexcept specification:  
noexcept
   (depuis C++11)

[modifier] Exemple

#include <iostream>
#include <locale>
// minimal custom facet
struct myfacet : public std::locale::facet {
    static std::locale::id id;
};
std::locale::id myfacet::id;
int main()
{
    // loc is a "C" locale with myfacet added
    std::locale loc(std::locale::classic(), new myfacet);
    std::cout << std::boolalpha
              << "Can loc classify chars? "
              << std::has_facet<std::ctype<char>>(loc) << '\n'
              << "Can loc classify char32_t? "
              << std::has_facet<std::ctype<char32_t>>(loc) << '\n'
              << "Does loc implement myfacet? "
              << std::has_facet<myfacet>(loc) << '\n';
}

Résultat :

Can loc classify chars? true
Can loc classify char32_t? false
Does loc implement myfacet? true

[modifier] Voir aussi

ensemble de facettes polymorphes qui encapsulent les différences culturelles
Original:
set of polymorphic facets that encapsulate cultural differences
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(classe) [edit]
obtient une facette d'un lieu
Original:
obtains a facet from a locale
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(fonction générique) [edit]