I get many warnings like this when I build an old project.
I asked AI chatbot which gave me several solutions, the recommended one is:
var hashBag = [String: Int]()
func updateHashBag() async {
var tempHashBag = hashBag // make copy
await withTaskGroup(of: Void.self) { group in
group.addTask {
tempHashBag["key1"] = 1
}
group.addTask {
tempHashBag["key2"] = 2
}
}
hashBag = tempHashBag // copy back?
}
My understanding is that in the task group, the concurrency engine ensures synchronized modifications on the temp copy in multiple tasks. I should not worry about this.
My question is about performance.
What if I want to put a lot of data into the bag? Does the compiler do some kind of magics to optimize low level memory allocations? For example, the temp copy actually is not a real copy, it is a special reference to the original hash bag; it is only grammar glue that I am modifying the copy.