UnsafeBufferPointer should be Slicable

Originator:robnapier
Number:rdar://21579432 Date Originated:27-Jun-2015 12:33 PM
Status:Open Resolved:
Product:Developer Tools Product Version:Swift 2b2
Classification:Enhancement Reproducible:Not Applicable
 
extension UnsafeBufferPointer: Sliceable {
    public subscript (bounds: Range<Index>) -> UnsafeBufferPointer<T> {
        return(UnsafeBufferPointer(start: self.baseAddress + bounds.startIndex, count: bounds.count))
    }
}

Since UnsafeBufferPointer is intended to provide a Collection interface, and it is efficiently Sliceable, it makes sense to make it Sliceable.

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