Preparing for Swift 5 Ownership
summary
Explains concrete changes coming with Swift 5 ownership: the Ownership Manifesto proposals, a compiler prototype that already implements borrow semantics, the shared parameter keyword that passes read-only references instead of copying CGPoints, and the planned move-only types to forbid copies for expensive values. Claims these let programmers reduce implicit copies and tune memory access, warns of nontrivial learning cost, and notes ownership is opt-in so existing code continues to work.
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