Provided by: itcl3-doc_3.4.3-3_all bug


       is - test argument to see if it is a class or an object


       itcl::is option ?arg arg ...?


       The  is  command is used to check if the argument given is a class or an object; depending
       on the option given. If the argument if a class or object, then 1 is returned.  Otherwise,
       0  is  returned.   The  is  command  also recognizes the commands wrapped in the itcl code

       The option argument determines what action is carried  out  by  the  command.   The  legal
       options (which may be abbreviated) are:

       is class command
              Returns 1 if command is a class, and returns 0 otherwise.

              The  fully  qualified  name of the class needs to be given as the command argument.
              So, if a class resides in a namespace, then the namespace needs to be specified  as
              well.  So, if a class C resides in a namespace N, then the command should be called
              is N::C
              is ::N::C

       is object ?-class className? command
              Returns 1 if command is an object, and returns 0 otherwise.

              If the optional "-class" parameter is specified, then the command will  be  checked
              within  the  context  of the class given. Note that className has to exist. If not,
              then an error will be given. So, if className is uncertain to be a class, then  the
              programmer  will  need  to  check  it's existance beforehand, or wrap it in a catch

              So, if c is an  object  in  the  class  C,  in  namespace  N  then  these  are  the
              possibilities (all return 1):
              set obj [N::C c]
              itcl::is object N::c
              itcl::is object c
              itcl::is object $obj
              itcl::is object [itcl::code c]


       class, object