Re: Returning a nil float?
Re: Returning a nil float?
- Subject: Re: Returning a nil float?
- From: Jean-Daniel Dupas <email@hidden>
- Date: Mon, 1 Feb 2010 19:58:18 +0100
Le 1 févr. 2010 à 19:17, Michael Gardner a écrit :
> On Jan 29, 2010, at 6:44 PM, Chunk 1978 wrote:
>
>> i'm almost 100% sure it's not possible to return a nil on basic data
>> types, but just incase i'll post the question.
>>
>> ------------------------------------------------------
>> - (float)panForSoundWithName:(NSString *)soundName
>> {
>> OpenALSound *sound = [soundDictionary objectForKey:soundName];
>> if (!sound) return 0.0f;
>> return sound.pan;
>> }
>> ------------------------------------------------------
>>
>> so above i'd like to write "if (!sound) return nil;". my reasoning is
>> because some attributes to a sound object (like pan) are created only
>> when the sound is initialized. if there is no sound object than there
>> should also be no pan value to return. unfortunately, the float
>> default 0.0f is also the default value for pan (range from -1.0 to
>> 1.0).
>
> Another option besides those already mentioned is to use exceptions. Whether they're appropriate depends on whether calling -panForSoundWithName: on non-existent sounds is part of your normal control flow, I guess.
>
This solution is not suitable in Cocoa. Exceptions are slow and should be used only when a critical error occurs. They should not be part of the normal flow and should not be used in this kind of situation.
-- Jean-Daniel
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