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Simon St.Laurent scripsit:
> I guess I think of those constraints as bonus things you can do once you
> have identified a type, not as something intrinsic to a particular
> type. Sort of like constraints applied through get/set accessors in Java.
Note my definition of type: a named class of values. (The name can be
a complex name, of course, like "non-negative integer" or "integer between
-200 and 55678".)
Mathematical note: the reason I insist on a type being named is to rein
in higher-order infinities. There are \aleph_0 values, and therefore there
are 2^\aleph_0 = \aleph_1 classes of values, but only \aleph_0 names.
Necessarily therefore a great many classes, corresponding to transcendental
real numbers, go unnamed.
John Cowan <email@example.com> http://www.reutershealth.com
I amar prestar aen, han mathon ne nen, http://www.ccil.org/~cowan
han mathon ne chae, a han noston ne 'wilith. --Galadriel, _LOTR:FOTR_