RE: is nmi translator off limits?

["Njål Fisketjøn" <n.f@xxxxxxx>]

>>With a service program I can change the parameter list to an existing 
>function, or let a completely different
>>function (with a changed parameter list) take over the name of an old 
>function; and still let old programs
>>using the old function work without modification or recompilation. How would 
>you accomplish this with your
>>CallM opcode?

>What you are describing is similar to function overloading. same function 
>name, different argument types or number 
>of arguments. Two completely separate modules. One of the great contributions 
>of c++ and bjarne stroustrup. ( if he 
>did not invent it, he sure showed how well it could work, esp when combined 
>with templates. ).  

In the first case I wasn't thinking of changing arguments types, just adding 
new parms.

>In my opinion, what you are describing is a bad programming method. Adds more 
>complexity to the system. If the new 
>module does something different that the old module, give it a new name or use 
>a typed language that supports overloading.

The new module need not do something different (if it does, I agree it should 
have a new name), but I have
done this once were the underlying database changed, and I wanted to keep the 
name since it was performing the 
same "logic", although with a completely rewritten interface.

>Or if you can justify this practice and agree that cpu is virtually free, 
>introduce an OvrPgm or OvrMod command.  
>When the module is called from the old pgms, override the call to the old 
>module.

I don't know, but I believe that service programs with different versions 
"inside" don't impose a large cpu
overhead. Should only require an added entry point table plus the extra 
executable code.



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