Hi swift-users,
(sorry for the cross post to swift-dev, but wasn't sure where it belongs)
I tried to find guarantees about the memory layout Swift tuples but couldn't
find anything. The reason I ask is because I'd like to use them as fixed sized
(stack allocated) arrays. I'm pretty sure they're actually not guaranteed to be
stack allocated but highly likely I assume :).
Am I correct in assuming that
let swift_events: (kevent, kevent) = ...
has the same memory layout as
struct kevent c_events[2] = ...
? In other words, is this legal:
var events = (kevent(), kevent())
withUnsafeMutableBytes(of: &events) { event_ptr in
precondition(MemoryLayout<kevent>.size * 2 == event_ptr.count)
if let ptr = event_ptr.baseAddress?.bindMemory(to: kevent.self,
capacity: 2) {
return kevent(someFileDescriptor, ptr, 2, ptr, 2, nil)
}
}
I'm assuming yes but I'd like to make sure.
Many thanks,
Johannes
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