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 performsdeletestatic_cast<std::locale::facet*>(f); wheref is the pointer to the facet.

[edit]Facet class

A class is afacet if

• it ispublicly derived from another facet, or
• it is a class derived fromstd::locale::facet and contains apublicly accessible declaration as follows:

static::std::locale::id id;

[edit]Member functions

[edit]Example

[edit]Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit]See also

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