You want to be able to do something like this?
... [ ... ] curry ... alien-callback
You can't do that directly, but there are several easy workarounds
that you can encapsulate. First of all, you can memoize compiled words
that call alien-callback. This is a heavyweight approach but it gives
you full generality:
MEMO: my-callback ( obj -- word )
[ ... do-callback ] curry '[ "int" { "int" "int" } _ "cdecl"
alien-callback ] define-temp ;
Now every time you call my-callback with a new value, the compiler
will be invoked and it will generate a new callback. This might be too
slow if you're doing this with a different object on every iteration
of a loop, or something like that.
A lighter-weight approach is that many C APIs that take callbacks can
also pass a void* "context" value that you specify at callback
registration time back to you. In that case, you can maintain a
hashtable mapping these void* to Factor objects.
Slava
On Sun, Feb 8, 2009 at 7:10 PM, Alex Drummond
<[email protected]> wrote:
> Hi, I was wondering if there is any way to pass a Factor object to C
> callback that was constructed using alien-callback.
> thanks,
> Alex
>
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