Re: Short-circuit evaluation
Re: Short-circuit evaluation
- Subject: Re: Short-circuit evaluation
- From: Igor Mozolevsky <email@hidden>
- Date: Tue, 23 Jun 2009 13:03:19 +0100
2009/6/23 Igor Mozolevsky <email@hidden>:
> 2009/6/23 Graham Cox <email@hidden>:
>> Just a quickie...
>>
>> If I have:
>>
>> BOOL someValue = [object returnsBool];
>>
>> someValue |= [anotherObject alsoReturnsBool];
>>
>> is the second line subject to short-circuit evaluation? In other words if
>> the first method returns YES, is the second called?
>
> The second one will be called - | is a bitwise OR, whereas || is a logical OR.
So, the second will only be evaluated if the first returns NO when
BOOL someValue = [object returnsBool] || [anotherObject alsoReturnsBool];
whereas what you have is
BOOL someValue = [object returnsBool] | [anotherObject alsoReturnsBool];
which is a bitwise OR of two YESes, essentially.
--
Igor
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