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
Not sure I like using the comma here...it's already feeling a bit overloaded
now. In some contexts, it's an expression delimiter, in others, it is part
of an operator. The "+&" doesn't seem too bad, but I'm not sure if the OR
case should be "-|" or also "+|". I had also considered "\&" and "\|",
since that is already used as a modifier to a lot of the comparison
operators. Of course, that opens the question on whether the logical not
character needs to be supported too.
I'm looking for an overarching rule here. Something like:
expr, expr, expr -- makes an array
expr, | expr, | expr -- ORs each expression together, but allows early
bailout if the completed expression(s) settle the result
the | can be omitted in IF/WHEN case because an array result is not
allowed.
But yes, it's a bit of a stretch.
Mike
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