[swift-evolution] [Pitch] Swift needs fixed-size array

[Karl Wagner]

> On 17 Apr 2017, at 19:52, Anders Kierulf via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Proposal: UnsafeMutablePointer almost provides what I need. However, it can only allocate memory on the heap, or it can take a given blob of memory and interpret it as something else. What’s missing is a way to allocate typed memory of a certain size on the stack or in a struct. For example, something like this, with support for subscripts, limited to value types:

What happens if you use alloca?
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