Nice - this is useful to me too, thanks very much. FWIW, instead of make-base-namespace I had to use make-gui-namespace to avoid a "cannot instantiate `racket/gui/base' a second time in the same process" error.
On Thu, Feb 9, 2012 at 10:15 PM, Robby Findler <ro...@eecs.northwestern.edu> wrote: > On Thu, Feb 9, 2012 at 9:12 PM, Eli Barzilay <e...@barzilay.org> wrote: >> The other way is what gets you what you want: you need to use >> `sandbox-namespace-specs' to make the sandbox share an instance of the >> necessary modules between your own code and the sandbox, so that >> structs in the sandbox are the same type as your own. Here's a quick >> example: >> >> #lang racket >> (require racket/sandbox 2htdp/image) >> (define ev >> (parameterize ([sandbox-namespace-specs >> (list make-base-namespace '2htdp/image)]) >> (make-evaluator 'racket #:requires '(2htdp/image)))) >> (image? (ev '(rectangle 2 2 'solid 'blue))) > > This is what I meant by "complex (fiddling with namespaces)" but I see > that happily it isn't complex and the sandbox happily does the > fiddling for you. > > Robby > ____________________ Racket Users list: http://lists.racket-lang.org/users
