[amelius]

Does the D compiler know how to mangle/demangle C++ names?

Do you have to write some kind of D header file for foreign C++ functions? Otherwise, how would D even know about the existence of e.g. vector<int>::push?

[biotronic]

https://dlang.org/spec/cpp_interface.html#cpp-templates

You will need to recreate the C++ function definitions in D and mark them extern(C++), but that's about it.