Happily Swift has interop with C, and they're working on actual C++[1], which would be a lot of wasted effort.

The question is very simple: Swift is meant to be a safe language, how feasible is that if a large chunk of the core types and runtime are implemented in C, C++, and Objective-C/C++? Migrating to Swift is the obvious and sensible step, unless you propose re-implementing them in yet another language?

[1] https://github.com/apple/swift/blob/main/docs/CppInteroperab...