CCFSet and CCFArray template wrappers

CCF.hpp

template <typename T>
struct CCFArray
{
  CFArrayRef array;
  CCFArray()
  {
    array = CFArrayCreate( kCFAllocatorDefault, 0, 0, 0 );
  }
  CCFArray(CFArrayRef cf):array(cf)
  {
    
  }
  int size()
  {
    return (int)CFArrayGetCount( array );
  }
  T operator[]( int i )
  {
    return (T)CFArrayGetValueAtIndex( array, i );
  }
  ~CCFArray()
  {
    CFRelease( array );
  }
};

template <typename T>
struct CCFSet
{
  CFSetRef set;
  CCFSet()
  {
    set = CFSetCreate( kCFAllocatorDefault, 0, 0, 0 );
  }
  CCFSet(CFSetRef cf):set(cf)
  {
  }
  int size()
  {
    return CFSetGetCount( set );
  }
  vector<T> toVector()
  {
    vector<T> v;
    v.resize( CFSetGetCount(set) );
    CFSetGetValues(set, (const void**)&v[0]);
    return v;
  }
  ~CCFSet()
  {
    CFRelease( set );
  }
};


// Set usage example, before: Copying a CFSet to a std::vector for iteration:
vector<IOHIDDeviceRef> devices;
if( CFSetRef cfDeviceSet = IOHIDManagerCopyDevices(hid) )
{
  devices.resize( CFSetGetCount(cfDeviceSet) );
  CFSetGetValues(cfDeviceSet, (const void**)&devices[0]);
  CFRelease(cfDeviceSet);
}


// After, with CCFSet: (note automatic memory management)
vector<IOHIDDeviceRef> devices;
CCFSet<IOHIDDeviceRef> devSet = IOHIDManagerCopyDevices(hid);
if( devSet.set )
{
  devices = devSet.toVector();
}


// CCFArray: iteration, before:
CFArrayRef elts = IOHIDDeviceCopyMatchingElements(devices[i], NULL, kIOHIDOptionsTypeNone);
if( elts )
{
  // iterate over all the elements
  CFIndex numElts = CFArrayGetCount( elts );
  for( int i = 0; i < numElts; i++ )
  {
    IOHIDElementRef elt = (IOHIDElementRef)CFArrayGetValueAtIndex( elts, i );
    if( elt )
      HIDDumpElementInfo(elt);
  }

  CFRelease( elts );
}

// After
CCFArray<IOHIDElementRef> elts = IOHIDDeviceCopyMatchingElements(devices[i], NULL, kIOHIDOptionsTypeNone);
if( elts.array )
{
  // iterate over all the elements
  for( int i = 0; i < elts.size(); i++ )
  {
    IOHIDElementRef elt = elts[i];
    if( elt )
      HIDDumpElementInfo(elt);
  }
}