Re: Comments on ORAC
Mike wrote:
>
> Matt Lewis wrote:
> > }}}
<eucode>
> > global function call_indirect_function( integer func, sequence args )
> > -- error handling here...
> > end function
> > </eucode>
{{{
> This throws up a subtle gotcha: Since indirect calls of both kinds could be
> treated as functions, what happens if a procedure is inadvertently used in
> an expression? The code will work but be wrong.
As above, I think it will crash pdq, in an elegant way if you want.
> But since indirect calls will always be slower than direct ones, is there
> really
> any point to optimizing? If not, then, there is no point to analysing the code
> either. I have no qualms about suspending the code I've just written - it's
> a hack anyway.
I assumed part of your plan involved (eg) arwen + orac, and the extra layer
round all message handling routines would probably be quite noticeable.
> If this mask were added to Euphoria, what (other than Orac) could take
> advantage of it? I would feel uncomfortable if Euphoria were modified just
> to suit Orac - particularly when I'm inclined to something else.
While I have no real example, there is clearly something quite powerful with
seamless calls. True, you could achieve much the same effect by storing
routine_ids and and define_c_func results along with an explicit tag, and
non-orac uses of this idea would need to hand-code and hand-call a version of
call_indirect_function().
> IMO, an easier solution is simply to add a specifier to a variable/constant
> declaration. I am going to do this shortly unless someone can convince me
> otherwise with very persuasive arguments.
The only remotely relevant existing examples I can thing of are the vHandler
table in win32lib, and the HandlerRoutine sequence in arwen. Both those happen to
be homogenous (all Eu functions), so a single specifier at the variable level
would probably work. But equally I could imagine someone wanting to replace
some-but-not-all of them with c routines in a dll...
Regards,
Pete
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