libstdc++
std::locale::id Class Reference

List of all members.

Public Member Functions

 id ()
size_t _M_id () const throw ()

Friends

template<typename _Facet >
bool has_facet (const locale &) throw ()
class locale
class locale::_Impl
template<typename _Facet >
const _Facet & use_facet (const locale &)

Detailed Description

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.

Definition at line 438 of file locale_classes.h.


Constructor & Destructor Documentation

std::locale::id::id ( )
inline

Constructor.

Definition at line 469 of file locale_classes.h.


Friends And Related Function Documentation

template<typename _Facet >
bool has_facet ( const locale ) throw ()
friend

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.

Template Parameters:
_FacetThe facet type to test the presence of.
Parameters:
__locThe locale to test.
Returns:
true if __loc contains a facet of type _Facet, else false.

Definition at line 103 of file locale_classes.tcc.

template<typename _Facet >
const _Facet& use_facet ( const locale )
friend

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.

Template Parameters:
_FacetThe facet type to access.
Parameters:
__locThe locale to use.
Returns:
Reference to facet of type Facet.
Exceptions:
std::bad_castif __loc doesn't contain a facet of type _Facet.

Definition at line 130 of file locale_classes.tcc.


The documentation for this class was generated from the following file: