Showing content from https://cplusplus.com/use_facet below:
function template
<locale>
std::use_facet
template <class Facet> const Facet& use_facet (const locale& loc);
Access facet of locale
Returns a reference to facet Facet of locale loc.
If the facet is not present in the locale, the function throws a bad_cast exception.
The function has_facet can be used to check if a locale has a particular facet present before attempting to use it with this function.
Parameters
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loc
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locale object.
The template parameter Facet shall be a facet type.
A facet type is a type publicly derived (directly or indirectly) from locale::facet with a static member id of type locale::id, such as the standard facets collate, codecvt, ctype, messages, moneypunct, money_get, money_put, numpunct, num_get, num_put, time_get and time_put.
Return type A const-qualified reference to the facet object.
Data races Argument loc is accessed, and the returned object may be used to access facet object.
Exception safetyStrong guarantee: if an exception is thrown, there are no changes in loc.
See also
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has_facet
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Check if locale has facet (function template)
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locale::facet
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Locale facet (public member class)
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