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

UnsafePointer no longer has a member .alloc. Use UnsafeMutablePointer.alloc instead. e.g. the following blankof() works as a universal initializer.

func blankof(type:T.Type) -> T {
    var ptr = UnsafeMutablePointer.alloc(sizeof(T))
    var val = ptr.memory
    ptr.destroy()
    return val
}

var red   = blankof(CGFloat)
var green = blankof(CGFloat)
var blue  = blankof(CGFloat)
var alpha = blankof(CGFloat)
color.getRed(&red, green:&green, blue:&blue, alpha:&alpha)
CGContextSetRGBStrokeColor(context, red, green, blue, 1)
// no need to dealloc because they are all structs, not pointers