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 friend _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.

       Definition at line 483 of file locale_classes.h.

Constructor & Destructor Documentation

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

       Definition at line 514 of file locale_classes.h.

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
           _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.

       Definition at line 104 of file locale_classes.tcc.

   template<typename _Facet > const friend _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.

       Definition at line 132 of file locale_classes.tcc.

Author

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

libstdc++                                        Thu Mar 26 2020                           std::locale::id(3cxx)