plain_fsm - for beginners and purists
Thu Feb 12 16:30:20 CET 2004
On Thu, 12 Feb 2004 09:47:12 -0500, Shawn Pearce <spearce@REDACTED>
> It would be nice if the code just didn't compile if you forgot the parse
> transform, rather than waiting until runtime to crash however. :)
I'm not sure this can be done... actually it could, if
I made it a local function instead:
Then we have to hope that the programmer hasn't actually
written a function plain_fsm_receive/1 for some
other purpose... ;-) We can minimize the risk by inventing an
unbelievably ugly name for the function...
Everyone with a strong opinion on the subject, please speak up.
> I thought a fun wasn't usable after a module was reloaded, because the
> reference to the code that the fun was using was directly to the
> a single version of the module (and not an external call)?
> Besides, can't a fun's magic name change between compiles, especially
> if I add another fun, so if it did use an external call to execute the
> fun in the new module, it might run the wrong fun?
I can't account for the algorithm used to generate fun names, but it
is relative to the enclosing function, so the only time you will break
a fun during code change is if you've inserted a fun definition ahead
of it in the same enclosing function... I think.
> -keyword(plain_fsm_receive, my_app_receive).
> with the parse transform converting to my_app_receive, (rather than
> just receive) so another parse transform can kick in. This is already
> possible with your current design, so perhaps that's really the best
> we have today...
Ok, then let's add
And have the linter check that you're not redefining keywords
used by the behaviour you're using. (:
Ulf Wiger, Senior System Architect
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