[MLton-devel] Fwd: Mark Tuttle

[Matthew Fluet]

> 1. Use IntInf
> 2. Use Int64
> 3. Use Word
>
> (1) is probably to costly performance-wise, but maybe we could try and
>     see?

We'd also need to mediate all of the places where Position.int's are
passed to C; we won't be able to hand off an IntInf.

> (2) will take a while to implement, but is the way we should go long
>     term.

Agreed.

> (3) would have as good a performance as we have now, and would allow
>     up to 4G, but I don't think it's allowed by the Basis Library
>     spec, which requires Position:> INTEGER

Depends on what you consider :> INTEGER implying.  Certainly we can export
Word as INTEGER (just need to implement a few missing values and
functions).  The fact that it is an opaque signature match means we will
never be able to confuse them with Int.ints.  It's just a question of
whether or not:

(Position.fromString "~123") + (Position.fromString "123")

necessarily equals (Position.fromString "0").

In any event, I don't think it would affect end users that much.  But,
certainly #2 is the way to go.

> Hmmm.  In thinking about it further, maybe (2) isn't so bad if we go
> with the FFI library for Int64.

Maybe not.



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