From Cppreference
std::locale::facet is the base class for facets. It provides a common base class so that locales could store pointers to the facets they implement in a single indexed container, and it abstracts support for facet reference counting. Whenever a facet is added to a locale, the locale increments the reference count in the facet (through an implementation-specific mechanism). Whenever a locale is destructed or modified, it decrements the reference count in each facet it no longer implements. Whenever a facet's reference count becomes zero, the locale performs delete static_cast<std::locale::facet*>(f) where f is the pointer to the facet.
[edit] Member functions
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constructs a new facet with specified reference count (protected member function)
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operator=
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the copy assignment operator is deleted (protected member function)
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(destructor) [virtual]
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the destructor is protected virtual (protected member function)
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[edit] Example
[edit] See also
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the facet index type: each facet class must declare or inherit a public static member of this type (class)
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