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