|Pointer value representation in Algol68? firstname.lastname@example.org (2000-10-08)|
|From:||email@example.com (Ken Walter)|
|Date:||8 Oct 2000 22:33:48 -0400|
|Keywords:||question, code, algol68|
Algol68 has rules about "scope" of REF REF values
to prevent pointer "up" the stack to something deallocated.
I can not take a reference to a local variable
and pass it to a more global scope. (I thibk thats the word?)
Even when I pass both the source and destination objects
to another procedure.
This means at run time for:
rri := ri;
The scopes of rri and ri must be compared.
If both are parameters then they must carry their scope information
I can not see how this can be done using a single "word"
as someone indicated many weeks ago in this group.
As I see it there are two "words", one for the pointer and one for the
"stack frame scope identifier".
Ken Walter WEEKDAY
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