| std::locale::id(3) | Library Functions Manual | std::locale::id(3) |
NAME¶
std::locale::id - Facet ID class.
SYNOPSIS¶
Public Member Functions¶
id ()
Constructor. size_t _M_id () const throw ()
Friends¶
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 Function 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
Parameters
Returns
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
Parameters
Returns
Exceptions
Author¶
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| Mon Dec 18 2023 | libstdc++ |