std::locale_id - Man Page
Facet ID class.
Synopsis
#include <locale_classes.h>
Public Member Functions
id ()
Constructor.
size_t _M_id () const throw ()
Friends
template<typename _Facet > const _Facet * __try_use_facet (const locale &) noexcept
template<typename _Facet > bool has_facet (const locale &) throw ()
Test for the presence of a facet.
class locale
class locale::_Impl
template<typename _Facet > const _Facet & use_facet (const locale &)
Return a facet.
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.
Constructor & Destructor Documentation
std::locale::id::id () [inline]
Constructor.
Friends And Related Symbol Documentation
template<typename _Facet > bool has_facet (const locale &) [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
_Facet The facet type to test the presence of.
Parameters
__loc The locale to test.
- Returns
true if __loc contains a facet of type _Facet, else false.
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
_Facet The facet type to access.
Parameters
__loc The locale to use.
- Returns
Reference to facet of type Facet.
- Exceptions
std::bad_cast if __loc doesn't contain a facet of type _Facet.
Author
Generated automatically by Doxygen for libstdc++ from the source code.