I use NAN for things like this. (Not A Number )
if( !sound ) return NAN;
and your test would then be
if( isnan( sound ) ) return nil;
provided you aren't doing any divisions by zero similar things in your code
which could cause the value to be NaN, it's a useful marker for "I don't care"
On 30-Jan-2010, at 8:44 AM, 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).
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