Xotcl July 2005

xotcl@alice.wu.ac.at

3 participants
2 discussions

info instances for mixins
by Ben Thomasson 15 Jul '05

15 Jul '05

Hi, I am looking for functionality similar to Class info instances for mixins and instmixins. Essentially I'd like: >xotclsh % Class A ::A % A a ::a % A info instances ::a % Class B ::B % A instmixin B % B info instances This last line to return. ::a Is this possible with any info proc that exists today or could something like this be easily added to the code? I am trying to simplify searches on a large object graph by using mixins. I already use introspection to find instances of certain classes. I would like to be able to do the same with mixin classes. Is the mixin functionality implemented with object->class pointers. Are there pointers mixin->object or mixin->class->object? Thanks, Ben

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abstract methods
by Koen Danckaert 13 Jul '05

13 Jul '05

Hello, The XOTcl manual says that an abstract method produces an error if it is called directly. It seems that this is not always the case. E.g., in the following example there is no error: Class C C abstract instproc a {} C instproc b {} {my a} C test test b >From an earlier discussion on the mailing list I found that predefined.xotcl contains the following code to avoid errors when an abstract method is invoked by "next": Object instproc abstract {methtype methname arglist} { if {$methtype != "proc" && $methtype != "instproc"} { error "invalid method type '$methtype', \ must be either 'proc' or 'instproc'." } [self] $methtype $methname $arglist " if {\[self callingproc\] != \[self proc\] && \[self callingobject\] != \[self\]} { error \"Abstract method $methname $arglist called\" } " } I guess the test should be "||" instead of "&&" ? But then, it doesn't do the right thing either, because callingproc is empty in case of an invocation by "next". Regards, Koen Danckaert

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Xotcl July 2005