Dennis,
#canUnderstand: is a message send to a class, and tells you whether
all of its instances respond to a particular message. #respondsTo: is
a message sent to an instance, and tells you whether that instance
will respond to a particular message. So...
5 canUnderstand: #+ --> false
5 class canUnderstand: #+ --> true
5 respondsTo: #+ --> true
Similarly, in your example,
ThisClass canUnderstand: #classCompilerClass --> false
ThisClass respondsTo: #classCompilerClass --> true
thisClass class canUnderstand: #classCompilerClass --> true
The names are unfortunately cryptic, but that is what they mean.
-anthony
On 10-May-21, at 3:50 PM, Dennis Smith wrote:
> If I take a class, any class, and say
>
> ThisClass canUnderstand: #classCompilerClass
>
> (or any other method defined in Class/ClassDescription/Behavior))
> Does it answer "false" -- when in fact I CAN send "classCompilerClass"
> to the class??
>
> I know technically why, I just don't know why it SHOULD be that way???
>
> --
> Dennis Smith +1 416.798.7948
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