Re: defined

[Ethan A M. <merritt@u.washington.edu>]

On Wednesday 31 May 2006 12:24 am, you wrote:
> 
> In the code is a redundant a.type = 0;

Noted.  It's a debugging patch, not a final version.
 
> The one issue is if somewhere an argument is passed in for 
> which a.type was never set to INTGR CMPLX or STRINGS but 
> neither is it a variable that had gone through PUSHV.

That cannot happen. The expression evaluation code screams
loudly if any type other than those 3 is set.

> Is this the strange case you are talking about?
> gnuplot> print defined(cos(x))
>          unknown type in real()

Yeah. That is what happens if a type other than INTGR/CMPLX/STRING
makes it through to the expression evaluation code.

> [proposal to add BOOLVAR as an enum DATA_TYPE
The problem with this is that it requires changing every single
routine in the expression evaluation chain, or at least confirming
that a correct default case has been set.  I had to do this when
I added the STRING type, and it's a pain.

> I see it is possible to have a function and variable of the same name.

That has always been true.  I don't think we can change it now
without eliciting complaints from HBB about breaking backwards
compatibility :-) 


-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742