How do you alloc/dealloc unsafe pointers in Swift?

Question

With Beta 4, I had this code that worked fine:

var red, green, blue, alpha: UnsafePointer
red = UnsafePointer.alloc(1)
green = Unsa         


        

Answer 1

This works, Swift is smart enough to know what to do with the & operator:

let color = UIColor.purpleColor()
var r:CGFloat, g:CGFloat, b:CGFloat, a:CGFloat = 0
color.getRed(&r, green: &g, blue: &b, alpha: &a)
CGContextSetRGBStrokeColor(c, r, g, b, a)

If you really want to do the alloc yourself, use your favorite flavor and construct the pointer like this:

let p = UnsafeMutablePointer(calloc(1, UInt(sizeof(CGFloat))))
// later don't forget to free(p)