Facet ID class.
The ID class provides facets with an index used to identify them. Every facet class must define a public static member locale::id, or be derived from a facet that provides this member, otherwise the facet cannot be used in a locale. The locale::id ensures that each class type gets a unique identifier.
|bool has_facet||(||const locale &||)|| throw ()
Test for the presence of a facet.
has_facet tests the locale argument for the presence of the facet type provided as the template parameter. Facets derived from the facet parameter will also return true.
|Facet||The facet type to test the presence of.|
|locale||The locale to test.|
|const _Facet& use_facet||(||const locale &||)||
Return a facet.
use_facet looks for and returns a reference to a facet of type Facet where Facet is the template parameter. If has_facet(locale) is true, there is a suitable facet to return. It throws std::bad_cast if the locale doesn't contain a facet of type Facet.
|Facet||The facet type to access.|
|locale||The locale to use.|
|std::bad_cast||if locale doesn't contain a facet of type Facet.|