Re: [racket-users] Equivalent of dynamic-wind post-thunk for with-handlers

On Wednesday, January 24, 2018 at 5:54:44 PM UTC-5, Alexis King wrote: > > Based on your question, why not just use dynamic-wind in combination > with with-handlers? Just keep in mind that the post-thunk could be > called multiple times if there is a continuation jump into value-thunk, > so you

Re: [racket-users] Equivalent of dynamic-wind post-thunk for with-handlers

Based on your question, why not just use dynamic-wind in combination with with-handlers? Just keep in mind that the post-thunk could be called multiple times if there is a continuation jump into value-thunk, so you should also wrap the whole thing with call-with-continuation-barrier if it’s importa

[racket-users] Equivalent of dynamic-wind post-thunk for with-handlers

I have a with-handlers expression which handles several exceptions appropriately and raises user-error exceptions, I have some additional code I'd like to be executed after the exception have been handled, analogous to dyanmic-wind's post-thunk argument or like the finally clause of a conventio

Re: [racket-users] Using ffi/unsafe/alloc

I think I haven't run into this because `r` and `foo` are usually combined into one value that's more Rackety. Maybe `allocator` should have a `get-result` optional argument similar to `deallocator`. Meanwhile: ;; Not exported: (define-fooapi make_foo (_fun (foo : (_ptr o _foo)) ->

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Re: [racket-users] Using ffi/unsafe/alloc

Konrad, I would create a wrapper like this: (define-fooapi make-foo (_fun (foo : (_ptr o _foo)     -> (r : _int)     -> (if r (begin (register-finalizer-and-custodian-shutdown foo destroy-foo) foo)     (error "can not make foo"))) Regards, Dmitry On 01/2

[racket-users] Using ffi/unsafe/alloc

Hi everyone, I am working on an FFI which overall progresses well - the Racket FFI library is really a very nice tool to have. The one problem I couldn't solve yet is handling resource allocation. My use case is very similar to what allocator/deallocator are meant for, except that the alloca

Re: [racket-users] whither `splicing-parameterize`? or am I doing it wrong?

It might make sense to `(set! new-parameterization #f)` at the end so that the parameterization (and the values it holds) can be GC'd sooner when splicing-parameterize is used at top level or module level. Ryan On 1/24/18 6:00 AM, Alexis King wrote: Here is an implementation of a version of