[Newbies] AMB

David T. Lewis lewis at mail.msen.com
Sat Mar 31 23:46:17 UTC 2018

I am CCing squeak-dev because St├ęphane Rollandin is active on that list.
Stef did the Squeak implementation and can probably answer your questions.


On Sat, Mar 31, 2018 at 03:51:22PM -0700, Sean P. DeNigris wrote:
> Is anyone familiar with the AMB project, installable from SqMap catalog? 
> I got excited by the description's assertion that "it can do incredible
> things" (it even provided an example. After reading the description, tests,
> code, and references, I have an inkling what it does, but don't quite
> understand what is "incredible" about it and don't want to miss the magic!!
> The catalog description is: 
> This is the "ambigous", "nondeterminist", "angelic" operator aka amb
> ... more seriously described as a declarative control flow statement able to
> enumerate over finite domains all values that make a program terminate. It
> uses continuations to walk the tree of possible tuples, backtracking when
> the program fails. 
> The amazing thing is the simplicity of the code: four short or very short
> methods on the instance side, the class side methods only providing
> syntactic sugar.
> And it can do incredible things such as:
> AMB assert: [:string :n :char | (string occurrencesOf: char) = n]
> 	over: #('maman' 'barbapapa' 'guiliguili' 'arthur' 'chtulu')
> 	and: #(2 4 1)
> 	and: #($m $b $a $i $u)
> See AMBTest for more magic.
> I would have been unable to implement this by myself ! This is a port of the
> code by Dorai Sitaram which is the reference documentation for amb:
> http://www.ccs.neu.edu/home/dorai/t-y-scheme/t-y-scheme-Z-H-16.html#node_chap_14
> -----
> Cheers,
> Sean
> --
> Sent from: http://forum.world.st/Squeak-Beginners-f107673.html
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