However, I want to circle back around to the discussion of the
short-circuited AND. We can't eliminate the usage on IF/WHEN, etc., but on
the other hand, there are certainly contexts where an and operator that uses
short-circuit logic might be useful. One could argue that an OR version
could also be useful. I don't believe this is possible for XOR, since the
result always depends on both values. Are there any operator combinations
that would make sense? Doubling up obviously doesn't work because && and ||
are already operators.
Another thought: perhaps
,& and ,|
are the bail-out AND and OR,
and in IF and WHEN context ',' expression separator "implies" the OR (|).
the IF/WHEN context is an AND, not an OR. The condition is only true if all
of the subexpressions are true, but will stop evaluating with the first
false result. An OR equivalent would stop evaluation with the first true
result.
Ouch, that's different to the NetRexx definition, which is the OR case.
(The first case that succeeds wins.) Or are we just reading/defining it
differently?
So:
If a=b ,| c=d then ...
would be identical to:
if a=b, c=d then ...
Mike
Ouch indeed. I'm afraid I did misread (or misremembered) how this was
defined in NetRexx and implemented it the other way. I think, in general,
this is much more useful as an AND case as it does not require the cascading
IF--THEN statements and is generally easier to handle with the ELSE case.
And on a When clause, you can't even do the cascade to allow it to go to the
next clause.
But there isn't any way to do the OR case, which is what the comma notation
was intended for, especially on WHENs where you are not looking for a fail
but for a success. As in the doc example:
select case i+1
when 1 then say 'one'
when 1+1 then say 'two'
when 3, 4, 5 then say 'many'
end
that third WHEN clause is not an AND case ...
Mike
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