30 Localization library [localization]

30.3 Locales [locales]

30.3.2 locale globals [locale.global.templates]

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template<class Facet> const Facet& use_facet(const locale& loc);
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Mandates: Facet is a facet class whose definition contains the public static member id as defined in [locale.facet].
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Returns: A reference to the corresponding facet of loc, if present.
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Throws: bad_cast if has_facet<Facet>(loc) is false.
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Remarks: The reference returned remains valid at least as long as any copy of loc exists.
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template<class Facet> bool has_facet(const locale& loc) noexcept;
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Returns: true if the facet requested is present in loc; otherwise false.