Sudarshan Gaikaiwari wrote:
> methhead: METHOD IDENT LPAREN arglist RPAREN {
> $$ := Method( , , , , , $2.s, $4, $1.s, $3, $5)
> } ;
>
> modify this rule to handle the case where we have operator tokens
> instead of ident tokens. Then translate the operator token to the
> predefined name.
Yes. I think this would be fairly easy to implement since you've got
the rest of the work done! (Anyone feel like experimenting with this?)
>...
> However if we generalize this to perform a proc lookup for all types
> then this will slow the interpretation of the usual code path down.
Hmmm, good point. How about a different implementation for procedures?
(There's not a lot of thought behind this, so it may be way off base.)
Suppose, in the case of procedure ||, the code for that procedure
*replaced* the code normally used to process ||? (That part should
be easy, since I'm fairly sure most of the operators are implemented
as functions internally.) So, it becomes the responsibilty of the
person writing procedure || to handle the 'normal' interpretation.
Something like the following should suffice (he claims):
procedure ||(a,b)
if (type(a) == "list") & (type(b) == "list") then
suspend a|||b
else suspend "||"(a,b)
end
This interpretation places more of a burden on the writer of
procedure ||, but it also has the advantage of letting you
override the existing behavior of operators! e.g.:
procedure ||(a,b)
if debugLevel >= X then
write(&errout, image(a),"||",image(b)," called.")
suspend "||"(a,b)
end
(I can imagine there might be more useful things to do here!)
On the other hand, since you could only have a single instance
of an 'operator' procedure, they're not as useful as having
'operator' methods on objects. So maybe it's not worth worrying
about adding procedure ||(a,b)?
--
Steve Wampler -- [EMAIL PROTECTED]
The gods that smiled on your birth are now laughing out loud.
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