[jasongrout]

https://github.com/QuantStack/xeus is an (in-development) implementation of the Jupyter protocol in C++, which lets you do kernel computation in any number of libraries that expose an API you can use from C++. Is that the sort of thing you are looking for?

[tavert]

Kind of, though C++ is a difficult language to use from anything other than C++ given there's no standard ABI. Either you need C++ glue-code wrappers around whatever language's FFI you actually want to use, or you embed Clang.