Is it possible to implement interoperability with C++ and Objective-C/C++?

[przemyslaw0]

Is it possible to implement interoperability with C++, Objective-C, and Objective-C++ by using Nelua metaprogramming facilities?

If some of the Nelua targets are system programming and making of libraries, interact directly with C++ and Objective-C/C++ would be a very good idea.

[mbekkomo]

Yes, it is possible. But requires you to write a wrapper for Nelua. Here's an example of interoperability with C++ in Nelua.

As you can see, there's a wrapper for the Hello library (hello.cpp). It contains functions that wraps C++ functions using extern "C". In hello.nelua, it contains several definition of libhello without nodecl attribute, and a code that'll run a function from hello.cpp using libhello.

It's basically like FFI <-> C++ method, you make a wrapper of it, compile it to shared library, and then use FFI to define and use the functions. Except the difference is, you don't use dlopen to get the functions, since you can define the functions into your .nelua, and also you're not limited to only compile it to shared library, static library can also be used.

[przemyslaw0]

Just another question, is it possible to use non-C features like classes in the Nelua file? I know that Nelua has no OOP support, but is it possible to write a macro to use the classes of C++ file?

[mbekkomo]

Seems not, but you can try look at an example in the Nelua repository.