Re: If statement evaluation with logical AND
Re: If statement evaluation with logical AND
- Subject: Re: If statement evaluation with logical AND
- From: Jeremy Dronfield <email@hidden>
- Date: Wed, 8 Dec 2004 17:42:44 +0000
Thanks. That's very helpful. I take your point about caching the return
value; in this case it isn't possible since the value will be different
each time through the loop.
Regards,
Jeremy
On 8 Dec 2004, at 3:50 pm, Guy English wrote:
On Wed, 8 Dec 2004 12:40:54 +0000, Jeremy Dronfield
<email@hidden>
What I mean is, is condition2 evaluated only if condition1 is true?
Yes. Thats why you can have code like:
if ( myPointer != NULL && myPointer->someValue != 0 ) blah( myPointer
);
The reason I ask: I have an if statement which is executed many times
in a loop, where condition1 is unlikely to be true and condition2 is a
fairly expensive call.
What you ideally want to do is avoid calling condition2 at all. If
it's result wont change during the run of the loop then cache it's
return value. You can do this either internally to the object you're
calling or loop through all your objects and stash condition2s results
in a lookup table.
Pardon my ignorance.
Nonsense - it's not the list for it maybe but it's a valid question.
Take care,
Guy
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