[mercury-users] Calling Mercury from C

[Simon Taylor]

On 11-Jul-2003, Michael Day <mikeday at yeslogic.com> wrote:
> Is there a reliable way of calling a Mercury closure from C?
> 
> At the moment, I create a Mercury forwarding predicate, export it, and 
> call *that* from C, passing the closure that I wish to call.
> 
> eg.
> 
> :- pred callback(pred(...), args).
> :- mode callback(pred(...), modes) is det.
> 
> callback(Pred, ...) :- Pred(...).
> 
> :- pragma export(callback(...), "callback").

That is the reliable way to call Mercury closures from C.

> Is there a way I can avoid this? I tried casting the closure directly to 
> the right kind of function pointer and calling that, but it crashed.

Why do you want to avoid it?

Simon.
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