How to get the address of swift int variable - ios

Question

I've done the following to allocate buffers for OpenAL in Swift:
init() {
self.buffers = NSMutableArray(capacity: 2);
self.sources = NSMutableArray(capacity: 2);
var sources: [ALuint] = [ALuint](count: 2, repeatedValue: 0);
var buffers: [ALuint] = [ALuint](count: 2, repeatedValue: 0);
alGenSources(2, UnsafeMutablePointer<ALuint>(sources));
alGenBuffers(2, UnsafeMutablePointer<ALuint>(buffers));
for i in 0...2 {
self.sources.addObject(NSNumber(unsignedInt: sources[i]));
self.buffers.addObject(NSNumber(unsignedInt: buffers[i]));
}
}
And it works perfectly fine. I cannot figure out how to delete it though. I tried:
deinit {
for i in 0...2 {
var source = self.sources.objectAtIndex(i).unsignedIntValue;
var buffer = self.buffers.objectAtIndex(i).unsignedIntValue;
//Error below.. I can't get address of "source" or "buffer".
alDeleteSources(1, UnsafePointer<ALuint>(ALuint(source)));
}
self.sources = nil; //cannot nil an NSMutableArray either..
self.buffers = nil;
}
So how can I get the address of the source and buffer variables to pass it to the UnsafePointer<ALuint>?
I'm trying to translate my Objective-C code below to the Swift code above:
-(void) init
{
if (!_sources)
{
unsigned int sources[2];
unsigned int buffers[2];
alGenSources(2, &sources[0]);
alGenBuffers(2, &buffers[0]);
_sources = [[NSMutableArray alloc] initWithCapacity: 2];
_buffers = [[NSMutableArray alloc] initWithCapacity: 2];
for (int i = 0; i < 2; ++i)
{
[_sources addObject: [NSNumber numberWithUnsignedInt: sources[i]]];
[_buffers addObject: [NSNumber numberWithUnsignedInt: buffers[i]]];
}
}
}
-(void) dealloc
{
for (int i = 0; i < [_sources count]; ++i)
{
unsigned int source = [[_sources objectAtIndex: i] unsignedIntValue];
unsigned int buffer = [[_buffers objectAtIndex: i] unsignedIntValue];
alDeleteSources(1, &source);
alDeleteBuffers(1, &buffer);
}
_sources = nil;
_buffers = nil;
}

Answer 1

I think you can simply use Array like:
class FuBar {
var sources = [ALuint](count: 2, repeatedValue: 0);
var buffers = [ALuint](count: 2, repeatedValue: 0);
init() {
alGenSources(2, &sources)
alGenBuffers(2, &buffers)
}
deinit {
alDeleteSources(2, &sources)
alDeleteBuffers(2, &buffers)
}
}
You don't have to use UnsafeMutablePointer explicitly, because in-out(&) expression of Array for UnsafeMutablePointer<T> is automatically converted to the pointer of the first element of the buffer of the array. see the docs.