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Surprisingly, Swift can do C++ direct interop too, without writing any mappings/type definitions:
https://forums.swift.org/t/swift-and-c-interoperability-work...
https://github.com/apple/swift/blob/main/docs/CppInteroperab...
https://github.com/apple/swift/blob/main/docs/CppInteroperab...
bindgen[1] already exists to autogenerate a rust API from c headers. It's inherently unsafe because C code is inherently unsafe. In particular, there is no language constructs like destructors or constructors, so you can't naively create a C-based API that can prevent memory/resource leaks and use after free errors. While C++ does have the same issues as C with unsafe pointer semantics, it does have constructors, destructors, and other features that map almost perfectly with Rust's RAII-based resource management, making it pretty easy to generate a safe(ish) rust interface. In practice, it's pretty easy to create a safe rust API from a C library: use bindgen to create the low-level unsafe API, then create rust wrappers using the ad-hoc creation and descruction library functions to implement RAII.
[1] https://rust-lang.github.io/rust-bindgen/