Scala, yes, but not C++ at all. Indirectly from C#, perhaps (and there is a fair bit of that), but there is very little that borrows from C++ at the language level.
Oh I would love to see a write up comparing it with Scala idioms. As a person who has done C# for a while a lot of idioms translate very well to Swift.
The if let x = whatever {} syntax in Swift is damn brilliant after looking at a ton of C# code with the as check.
