Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Contact Us
Online Help
Domain Status
Man Pages

Virtual Servers

Topology Map

Server Agreement
Year 2038

USA Flag



Man Pages
is(n) [incr Tcl] is(n)

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 command.
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 like:
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 statement.
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
3.3 itcl

Search for    or go to Top of page |  Section n |  Main Index

Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with ManDoc.