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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_use_facet.htm below:

C++ Locale Library - use_facet

It is used to access facet of locale and returns a reference to facet Facet of locale loc. 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.

Following is the declaration for std::use_facet.

template <class Facet> const Facet& use_facet (const locale& loc);

loc − It is a locale object.

It returns a reference to facet Facet of locale loc.

Strong guarantee − if an exception is thrown, there are no changes in loc.

It has accessed by Argument loc, and the returned object may be used to access facet object.

locale.htm

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