How to make an mutable C array for this data type?

Question

There's this instance variable in my objective-c class:

ALuint source;

I need to have an mutable array of OpenAL Sources, so in this case probably I need a mutable C-array.

But how would I create one? There are many questions regarding that:

1) How to create an mutable C-array?

2) How to add something to that mutable C-array?

3) How to remove something from that mutable C-array?

4) What memory management pitfalls must I be aware of? Must i free() it in my -dealloc method?

What do you need it for? Why are you assuming you need a C-style array? By the way, i don't think that community wiki fits here. — Georg Fritzsche
– Georg Fritzsche, Commented May 4, 2010 at 19:50

zoul · Accepted Answer · 2010-05-04 19:54:14Z

2

I’d keep things simple. ALuint is some kind of int, so that you can easily wrap it using NSNumber and stick it in an ordinary NSMutableArray:

ALuint bar = …;
NSMutableArray *foo = [NSMutableArray array];
[foo addObject:[NSNumber numberWithInt:bar]];

// and later
ALuint source = [[foo lastObject] intValue];

answered May 4, 2010 at 19:54

community wiki

zoul

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3 Comments

dontWatchMyProfile Over a year ago

good point... however, would be good to know how to do something in c, when performance matters. allocacting objective-c objects is very heavy.

zoul Over a year ago

It is not. It can make a difference when you’re writing a particle engine with dozens of thousands of particles to be recalculated at 50 fps. In the remaining 99.9 % of cases the bottleneck is going to be elsewhere.

Adam Over a year ago

That's not really an answer to the question. I came here looking for an answer to the same question as per the title, and this doesn't help :(. Apple's API's frequently require C arrays as input, and in many cases you need a mutable array. I was looking for something better than "cast void* pointers all over the place and look forward to hard crashing your app one day"

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