std::locale::id - Facet ID class.

       Generated automatically by Doxygen for libstdc++ from the source code.

                                                    libstdc++                              std::locale::id(3cxx)

std::locale::id::id()[inline]
       Constructor.

       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.

template<typename_Facet>boolhas_facet(constlocale&)[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.

       TemplateParameters_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(constlocale&)[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.

       TemplateParameters_Facet The facet type to access.

       Parameters__loc The locale to use.

       Returns
           Reference to facet of type Facet.

       Exceptionsstd::bad_cast if __loc doesn't contain a facet of type _Facet.

       std::locale::id - Facet ID class.

       #include <locale>

   PublicMemberFunctionsid ()
           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.
       classlocaleclasslocale::_Impl
       template<typename_Facet > const _Facet & use_facet (const locale &)
           Return a facet.