copy
NAMESYNOPSIS
DESCRIPTION
EXAMPLES
SEE ALSO
KEYWORDS
___________________________
NAME
oo::copy − create copies of objects and classes
SYNOPSIS
package require TclOO
oo::copy sourceObject ?targetObject? ___________________________
DESCRIPTION
The oo::copy command creates a copy of an object or class. It takes the name of the object or class to be copied, sourceObject, and optionally the name of the object or class to create, targetObject, which will be resolved relative to the current namespace if not an absolute qualified name. If targetObject is omitted, a new name is chosen. The copied object will be of the same class as the source object, and will have all its per-object methods copied. If it is a class, it will also have all the class methods in the class copied, but it will not have any of its instances copied.
After the targetObject has been created and all definitions of its │ configuration (e.g., methods, filters, mixins) copied, the <cloned> │ method of targetObject will be invoked, to allow for customization of │ the created object such as installing related variable traces. The only │ argument given will be sourceObject. The default implementation of this │ method (in oo::object) just copies the procedures and variables in the │ namespace of sourceObject to the namespace of targetObject. If this │ method call does not return a result that is successful (i.e., an error │ or other kind of exception) then the targetObject will be deleted and │ an error returned.
The result of the oo::copy command will be the fully-qualified name of the new object or class.
EXAMPLES
This example creates an object, copies it, modifies the source object, and then demonstrates that the copied object is indeed a copy.
oo::object
create src
oo::objdefine src method msg {} {puts foo}
oo::copy src dst
oo::objdefine src method msg {} {puts bar}
src msg → prints "bar"
dst msg → prints "foo"
SEE ALSO
oo::class(n), oo::define(n), oo::object(n)
KEYWORDS
clone, copy, duplication, object
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