Hello,
I've just started looking at XOTcl over the last couple days, and so far I like it a lot. Since I'm still learning, I assume I've overlooked something in the documentation, but I can't find how to remove a forwarded method from an object. It seems that all I can do is add a forwarded method, but once installed, I can never unforward a method. Is this true?
Here's an (simplified) example of what I'm trying to do:
Object a a proc foo {args} { puts "a: [self] foo" }
Object b b set overrides {} b proc foo {obj} { puts "b: [self] foo" if {-1 == [lsearch [my set overrides] $obj]} { puts "b is overriding $obj foo" $obj forward foo [self] overridefoo $obj } }
b proc overridefoo {obj args} { if {$args eq "done"} { puts "stop forwarding foo for $obj" set idx [lsearch -exact [my set overrides] $obj] my set overrides [lreplace [my set overrides] $idx $idx] # This doesn't work! What should be here? $obj forward foo {} puts "redispatching foo to native $obj foo" $obj foo $args } else { puts "using override of foo on $obj $args" } } a foo 123 b foo a a foo 234 a foo done
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From what I gather, the intended mechanism for doing this is to use a mixin to intercept the foo
method, but a already has a foo method that's being used for other purposes. I suppose I could dynamically create another object (or would it have to be a class?) to use as a mixin, but that seems unnecessarily complex. Is there a better way to accomplish what I'm trying to do?
BTW, I'm running xotcl 1.3.6. If I run the above sample 3 times, I get the following error:
procedure "foo" has formal parameter "::xotcl::initProcNS" that is not a simple name
and the interpreter crashes on the next command. That's probably a bug, but since I'm not at the latest release, I don't know if it's something that's been fixed already.
Thanks.
Scott
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