> On Dec 23, 2015, at 7:50 PM, Félix Cloutier via swift-evolution > <[email protected]> wrote: > > The & operator isn't exactly an address-of operator. Does &arr[0] even return > a pointer to the inner buffer? When you use & with properties (and possibly > with subscripts as well), Swift may create a local, copy the property value > to it, pass a pointer to that local, and copy back the output to the property. > > Anyway, you are probably looking for Array.withUnsafe(Mutable?)BufferPointer: > > arr.withUnsafeMutableBufferPointer { foo($0, $0.count) } > > Félix
The comments in the generated header for UnsafeMutablePointer claim that its regular init() method constructs a null pointer. Therefore, I think you should just be able to: foo(UnsafeMutablePointer<T>(), 0) Charles
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