[m-dev.] Re: assertions (was: Assocative predicates)
David Glen JEFFERY
dgj at cs.mu.OZ.AU
Fri Apr 24 13:21:13 AEST 1998
On 24-Apr-1998, Peter Schachte <pets at students.cs.mu.oz.au> wrote:
> So in summary, here are the new declarations/directives I'd like:
> :- specification Atom <=> Body.
> :- assertion Body.
> :- admissible Atom => Body.
> :- valid_term Term => Body. % or maybe Term::Type => Body.
> The only other thing I can think of is that these should be allowed in type
> classes, too, to add extra constraints to, and information about, the
> instances of the class. Perhaps the valid_term syntax will need to be
> broadened to make it possible to refer to instances of the type parameters
> of the instances of the class.
I think you can get the same effect by making assertions about type class
methods and having the compiler (or theorem prover, or whatever) check that
assertion about that method for each instance declaration.
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