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std::has_facet

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Lokalisierungen Bibliothek
Locales und Facetten
Original:
Locales and facets
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locale
has_facet
Buchstaben-Klassifikation
Original:
Character classification
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Conversions
Original:
Conversions
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Facet Kategorie Basisklassen
Original:
Facet category base classes
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Facet Kategorien
Original:
Facet categories
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Locale-spezifische Facetten
Original:
Locale-specific facets
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Code-Konvertierung Facetten
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Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C locale
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C locale
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Defined in header <locale>
template< class Facet >
bool has_facet( const locale& loc );
Prüft, ob die locale loc implementiert die Facette Facet .
Original:
Checks if the locale loc implements the facet Facet.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

loc -
das Gebietsschema Objekt abzufragen
Original:
the locale object to query
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[Bearbeiten] Rückgabewert

Versandkosten true, wenn die Facette Facet in der locale installiert wurde loc, false sonst .
Original:
Returns true if the facet Facet was installed in the locale loc, false otherwise.
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[Bearbeiten] Exception-Spezifikation

noexcept specification:  
noexcept
  (seit C++11)

[Bearbeiten] Beispiel

#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';
}

Output:

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

[Bearbeiten] Siehe auch

eingestellt von polymorphen Facetten, die kulturellen Unterschiede zu kapseln
Original:
set of polymorphic facets that encapsulate cultural differences
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(Klasse) [edit]
erhält eine Facette von einem locale
Original:
obtains a facet from a locale
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(Funktions-Template) [edit]