copy(n) TclOO Commands copy(n)
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 con-
figuration (e.g., methods, filters, mixins) copied, the <cloned> method
of targetObject will be invoked, to allow for customization of the cre-
ated object such as installing related variable traces. The only argu-
ment 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
TclOO 0.1 copy(n)
tcl 8.6.0 - Generated Sun Jan 13 10:39:28 CST 2013