[swift-evolution] SE-0138 UnsafeRawBufferPointer
jeremy.j.pereira at googlemail.com
Tue Sep 27 03:17:51 CDT 2016
> Annotating that a parameter of a closure should not escape the closure is probably a worthwhile thing to have, anyway. Currently we only allow that for function-type parameters, but there are other parameters you might give (such as the pointer in `String.withCString()`’s closure) which should not escape their context.
It certainly needs to be at least explicitly documented somewhere. I’ve seen people use it in published code to obtain a pointer to (fro example) the bytes in an array without realising that the storage could easily go away.
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