TIL Swift will have fixed size arrays

TIL Swift will have fixed size arrays: InlineArray, a fixed-size array.

public struct InlineArray<let count: Int, Element: ~Copyable>: ~Copyable {}

I was surprised to discover that Swift accepts constants in generic declarations, enabling definitions like InlineArray<4, Int>. I look forward to reading more documentation on this topic.

Another intriguing finding: @available attribute could be used to check not only the Swift version but also the version of the Swift Standard Library:

@available(SwiftStdlib X.Y)
extension InlineArray: Equatable where Element: Equatable // & Element: Copyable

TIL Swift already supports Temporary uninitialized buffers.

I’d like to remember this quote for future reference—even though it only indirectly relates to the proposal above:

To me, ManagedBuffer says “I want to allocate a refcounted object with an arbitrarily long tail-allocated buffer” thus avoiding two heap allocations when one will do. I can then use that object as I would use any other object.