Re: Error with lists

[Marcus G. Daniels]

>>>>> "DA" == David Aliaga <address@hidden> writes:

DA> because it is an Instance variable of an object and not a
DA> temporal variable. so it seems the "drop everything" rule is not
DA> true after all. 

Well, dropping an object will invalidate the object pointer, but I don't
think that's your point. 

You'll only see automatic dropping of ivar objects when you drop a zone
in which the object and its members were allocated. 

DA> WHY there is no a [list drop] at the end? (I ask this because in
DA> Heatbugs in the HeatSpace.m file method findExtremeType.. there is
DA> a [heatList drop] even after the [heatList deleteAll] that is
DA> supposed to drop all the elements of the list

There could have been; I was just demonstrating that deleteAll works on
empty lists.

There are three distinct operations:

-removeAll: Empty a list, keeping the List itself.

-deleteAll: Empty a list and destroy the members, keeping the List itself.

-drop:      Keep the members, dropping the List.  You might want to do this
            if you are doing different kinds of bookkeeping on the same 
            members

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