[swift-dev] `withUnsafePointer` mutates `self`

[Kevin Ballard]

On Tue, Dec 15, 2015, at 03:03 PM, Joe Groff via swift-dev wrote:
> 
> Yeah, it seems to me like a reasonable refinement for 'withUnsafePointer' to take an immutable parameter. Since this is a stdlib API change, you should suggest that on swift-evolution.

A change like that is going to break any code that relies on the inout optimization (where it uses call-by-reference instead of copy-in copy-out when possible). Yes, such code is in violation of Swift semantics today, but it does work.

-Kevin Ballard