Re: Exported Variables (was Long Constant Names)

I don't like LIKE in a prototype probably because of your reason 2, but 
worded differently.  I put my prototypes in a /copy.  I don't want to have 
to count on the variable I am doing a LIKE on existing in the program I 
add the prototype to.

Rob Berendt
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"Paul Morgan" <pmorgan@xxxxxxxxxxxxxx> 
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01/07/2005 10:46 AM
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Re: Exported Variables (was Long Constant Names)






Barbara,

Pass-by-copy would be best.  Good to see that it's on a future enhancment
list.

BTW, I object to using LIKE definition in a prototype because:

1) It violates the idea of a procedure as being immutable.  If the 
interface
changes it requires retesting.  You want to avoid changing the interface 
at
all costs.  Better to write a new replacement interface if the variable
changes. (this also applies to LIKE definitions in a procedure interface)

2) It sort of defeats the purpose of encapsulation.  Another variable must
be brought out of the internals of the procedure just to use the 
prototype.
Why make me code a data structure or variable just to define a parameter 
in
a prototype?  More extra variables I don't really need in my calling
program.  Makes the procedure unwieldily.

Paul

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Paul Morgan
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"Barbara Morris" wrote

> I think CONST is working correctly to stop the compile.  (We do have a
> "pass by copy" parameter-passing-mode on our possible future
> enhancements list.)
>
> Defining the parameter-passing temporary LIKE the constant would only
> work if it was the same type as the prototyped parameter. I guess it
> would be a good practice to define every by-reference prototyped
> parameter LIKE or LIKEDS something, so that temporaries could be easily
> defined LIKE or LIKEDS the same thing.
>
>  D myproc_types         ds              qualified
>  D                                      based(typedef_dummy)
>  D   myparm                        10a
>
>  D myproc               pr
>  D   myparm                             like(myproc_types.myparm)
>
>  ...
>
>  D myparmTemp           s               like(myproc_types.myparm)

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