Name

typeid operator — Runtime type identification operator

Synopsis

               postfix-expr := typeid ( expression ) | typeid ( type-id )

The typeid operator returns a const reference to a type_info object that describes type-id or the type of expression. If expression is an lvalue (not a pointer) of a polymorphic class, the type_info of the most-derived class is returned. Otherwise, expression is not evaluated, and the type_info of its static type is returned.

Each distinct type has its own associated type_info object, but type synonyms (such as those created with typedef) have the same type_info object.