Re: "eval"?

The easiest way is to use Backend.Interact.useStream.  (Just open
Backend.Interact to see the signature.)  The trick is to arrange
for some ref-cell of known type to be in scope (bound at the interactive
toplevel), and have the code that you send to useStream set that
ref cell.  This way you can later get access to the value.

A bit more tricky is using Backend.Interact.evalStream, since you
have to provide an explicit environment.  You will have to
make use of structure EnvRef to get access to the various environments
that the toplevel loop manipulates.  (Just say open EnvRef.)
See sml/base/compiler/TopLevel/interact/* for more info on what's
going on.  (This is in 110.60.)

Hope this helps...

Matthias


On Nov 23, 2006, at 10:49 AM, Geoffrey Alan Washburn wrote:

>
> 	Is there a straightforward way to implement something a little like
> Scheme, etc. "eval" using the visable compiler?  I've looked some  
> at the
> signatures, but I haven't been able to puzzle anything out based upon
> the types alone.
>
>
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