Could a similar approach be used to provide nlopt for Julia?

[dmbates]

I was wondering if the approach of using a global object until such time as cfunction can support a closure could also be used to generate a Julia package for the nlopt library? I would be willing to help in whatever way I can on such a project (although I realize it may be faster for you to work on it alone) because I really want to be able to optimize a nonlinear function subject to box constraints.

[stevengj]

Yes, it could. The main thing at this point (other than coding, of course), is to decide what the NLopt interface in Julia should look like.

[stevengj]

Actually, it is now (in Julia 0.2) possible to pass true closures with Julia, with the help of the void* pass-through arguments in the cubature or NLopt code, although the syntax is still slightly in flux (see Julia issue #2554).