[gambit-list] Promises & lazy thunks

Bradley Lucier lucier at math.purdue.edu
Mon Apr 29 17:12:39 EDT 2013


On Apr 29, 2013, at 4:31 PM, Jason Felice wrote:

> 
> On Mon, Apr 29, 2013 at 4:13 PM, Marc Feeley <feeley at iro.umontreal.ca> wrote:
> 
> Primitives like "cons" and "list" should not force their arguments because they are not strict (i.e. they don't need to know the value of the arguments).
> 
> It isn't clear if type predicates are strict or not.  I can see arguments both ways.
> 
> Hmm, I can't think of a reason to make them lazy.  What's the thought?

Well, if you'd like to see whether something is a promise or a fixnum, you'd have to call (promise? x) first if (fixnum? x) always forces its argument.

I've been thinking about this a bit, I'm not going to use the auto-force Gambit, but perhaps the type predicates should be made consistent.

Brad

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