[swift-evolution] Does protocol support add to an object's size?

[Karl Wagner]

> On 15 Feb 2017, at 18:51, Daryle Walker via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I don't know how protocol support works. I asking because I want to maintain the stride of an array being the total count times the stride of the element, which would complicate nominal arrays if adding protocols to one breaks that. 
> 
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The stride of an Array<T> is the width of a pointer, since Arrays are stored indirectly. Also, the allocated capacity may be greater than the number of elements actually contained in the Array. If you want a fixed-size group of elements, with a stride equal to the number of elements multiplied by the per-element stride, use a tuple.

- Karl