Re: Can switch be used here?

FROM : Chas Spillar
DATE : Mon Jul 24 19:22:45 2006

If I remember correctly, a switch statement case must be a compiled time
integral value.  That is, once the compilation is finished the value of the
case must be known.  Thus, what you describe (using a boolean value) would
not work.  If you can map the various boolean cases to  match a single
integral value then it can be made to work.  However, a laddered
if-then-else would be clearer.

E.g.

If (f==0) {
} else if (l = 0) {
} else if (f > l) {
} else if (f == l) {
} else if (f < l) {
}

Better would be to just subtract the two counts:

f - l

If the value is negative f is smaller than l, if the value is positive then
f is greater than l, if the value is 0 they are equivalent.

Chas.

> From: Brad Bumgarner <b.<email_removed>>
> Date: Mon, 24 Jul 2006 11:13:21 -0600
> To: Cocoa-Dev Mail Cocoa-Dev Mail List <<email_removed>>
> Subject: Can switch be used here?
>
> I have NSMutableSets f & l, each containing a variable number of
> items, including a possible none, and I want to do something based on
> which is larger, can I set this up using a switch statement?
> Something like (sudo code):
>
> switch (result)
> {
> case f = 0:
> do something;
> break;
> case l = 0:
> do something;
> break;
> case f > l:
> do something;
> break;
> case f == l:
> do something;
> break;
> case f < l:
> do something;
> break;
> }
>
> Or can I only accomplish this using if...then...else structures?
>
> Thanks,
> Brad Bumgarner, CTA
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