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

[Anders Kierulf]

> On Apr 17, 2017, at 12:37 PM, Karl Wagner <razielim at gmail.com> wrote:
> 
>> On 17 Apr 2017, at 19:52, Anders Kierulf via swift-evolution <swift-evolution at swift.org <mailto: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?

Doesn’t look like using alloca is recommended in Swift: https://bugs.swift.org/browse/SR-323

Also, while it might be used as a hack for stack allocations, it wouldn’t allow inclusion into structs.

Anders
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