| Re: Object-Oriented Programming Question [message #10532] |
Thu, 18 December 1997 00:00  |
rivers
Messages: 228
Registered: March 1991
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Senior Member |
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In article <34986079.BC1BBB4F@pppl.gov>, Peter Stoltz <pstoltz@pppl.gov> writes:
>> Hi everyone-
>
> I have finally gotten around to trying out object-oriented programming
> with IDL, and I have a question about data encapsulation.
>
> I define an object structure A that has as one of its data members
> another object B (A has a B). So far as I can tell, when one creates an
>
> instance of A, one cannot invoke the methods of class B through the
> syntax
>
> IDL> a=obj_new('A')
> IDL> a.b->some_method
>
> % Object instance data is not visible outside class methods
> % Execution halted
It's much simpler:
IDL> a->some_method
will invoke member b's "some_method". This works fine as long as "some_method"
is not "overloaded", i.e. "a" does not have a routine of the same name. If it
does, then you will get "a's" version by default. There is a syntax which will
allow access to b's method even in this case. I forget it, but it's in the
manual.
____________________________________________________________
Mark Rivers (773) 702-2279 (office)
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or:
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