I wonder how to use "cxx" with 3rd C++ interface?

[dbsxdbsx]

Let me make it clear. I got a project which need to use a 3rd C++ library(with lib and header).
To use it , I have to do so in C++:

#include <"ThirdPartyInterface.h">
class CMyClass: public ThirdPartyInterface{
virtual callbackFrom3rdPartyInterface();// I need to implement it. 
};

[dtolnay]

If you want to use Rust logic to implement the interface required by the C++ library, it would be something like this:

• lib.rs:

#[cxx::bridge]
mod ffi {
    extern "C" {
        include!("cmyclass.h");

        type CMyClass;

        // plus, optionally, any accessors that Rust needs to access fields
        // of the opaque type CMyClass
    }

    extern "Rust" {
        fn c_my_class_callback(this: &mut CMyClass);
    }
}

fn c_my_class_callback(this: &mut ffi::CMyClass) {
    // the implementation
    println!("it works");
}

• cmyclass.h:

#include "ThirdPartyInterface.h"

class CMyClass : public ThirdPartyInterface {
  void callbackFrom3rdPartyInterface() override;
};

• cmyclass.cc:

#include "cmyclass.h"
#include "lib.rs"

void CMyClass::callbackFrom3rdPartyInterface() {
  c_my_class_callback(*this);
}

[dbsxdbsx]

@dtolnay, thanks.