[mercury-users] semidet vs unique updating

Michael Day mikeday at bigpond.net.au
Wed Oct 17 15:19:56 AEST 2001

> If this is a crucial performance problem for your application, you
> could implement something using impure code and give it a pure
> interface.

Which pure interface? That's really my question. It doesn't seem possible
to do conditional, semidet updates to a unique structure even though you
can guarantee that the structure will not be modified if the predicate


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