To: William Chesters <firstname.lastname@example.org>
Subject: Re: Proposal for study: Add a categorical Initial type to ocaml
Date: Sun, 10 Oct 1999 18:38:44 -0400
Of course, it is problematic that "None" and "Some None" are
indistinguishable. But is it a reason to not have such a facility (as
a storage-cost-free "option" type constructor)?
I'd like to believe that the answer is "no" -- that the efficiency
values of such a type-constructor outweigh the semantic difficulties.
Of course, there's only one way to prove that -- by implementing both
and trying it out on large programs.
>>>>> "WC" == William Chesters <email@example.com> writes:
WC> The problem is that if you have a value of the type `int
WC> option option', you have to be able to distinguish between
WC> `None' and `Some None'! If both the enumeration-indirections
WC> are elided, you can't; if only one of them is, you have
WC> inconsistency which would presumably have to be resolved using
WC> whole-program optimisation or something.
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