Hello,
So bindMemory is part of the memory model and memory can only bind to one type
at a time to avoid aliasing. But what does binding actually do? Is it somehow
communicating with the optimizer?
A tangentially related second question, in the following example:
let count = 3
let mutablePointer = UnsafeMutablePointer<Int16>.allocate(capacity: count)
defer {
mutablePointer.deallocate(capacity: count)
}
mutablePointer.initialize(to: 1234, count: count)
defer {
mutablePointer.deinitialize(count: count) // must I do this?
}
Is it bad form if I don’t deinitialize and go straight to deallocate? I can
see where it is important for ref types (to update ref counts, etc). Is it one
of those things that the optimizer can remove for the case of value types?
Finally, if I initalize with some other means, such as with a raw buffer
pointer subscript, is there any need to deinitialize? Can such memory be
considered initialized if I bind it with a type?
// 1
let pointer = malloc(byteCount)
defer {
free(pointer)
}
let mutableRawBufferPointer = UnsafeMutableRawBufferPointer(start: pointer,
count: byteCount)
for index in mutableRawBufferPointer.indices {
mutableRawBufferPointer[index] = 42 + UInt8(index)
}
Perhaps there is a document or proposal somewhere that talks about these
things. Sorry if I missed it.
Thanks as always,
Ray
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users
