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> > In FriCAS default is that
> > data may be shared, so you can not safely pass it to
> > destructive operations.
>
> What I care about is consistency: by your default, you
> think it's OK to have construct and parts transfer
> ownership, but not always. So it's OK (and preferred)
> to implement 'construct' as "construct s == ref s"
> in Stack without copy.
Yes.
>
> So the default rule is non-destructive functions sharing
> structure and destructive functions make copies before
> changing, instead of non-destructive functions copying
> structure and destructive functions apply directly.
I would say: make copy before use of destructive functions.
Function which performs destructive operations on a copy
is non-destructive.
> If so, my patch for bags.spad needs changes again.
Yes. :(
--
Waldek Hebisch
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