On Dec 26, 2008, at 7:53 PM, Larry Garfield wrote:
I have an object to which I want to add behavior (methods). I
cannot use
inheritance here because the object is already of a type or subtype
(vis, I am
already using inheritance for something else), and because I want
to be able
to add multiple types of behavior at runtime.
If I understand what you are wanting to accomplish, perhaps a simpler
solution:
Whenever I create a function in a core-level class, I add pre- and
post- execution language to it. For example:
class foo_bar {
function foo () {
if (!on_foo()) {
return FALSE;
}
// normal foo code
// normal foo code
// normal foo code
// normal foo code
// normal foo code
if (!more_foo()) {
return FALSE;
}
}
function on_foo() {
return TRUE;
}
function more_foo() {
return TRUE;
}
}
-- then in the child class:
class child_bar extends foo_bar {
function on_foo() {
// runtime code
// runtime code
// runtime code
// runtime code
return TRUE; // (or FALSE)
}
}
Ken
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