Re: Interfacing with C++ Class named Object

[Robert M. Münch via Digitalmars-d-learn]

On 2018-05-01 17:14:53 +0000, Robert M. Münch said:

Yes, great! Thanks. I could extend the code now. But I get a next problem:

extern (C++, b2d) {
  class AnyBase {
    bool isShared();
  }

  pragma(mangle, "Object");
  class b2dObject : AnyBase {
  }

  class Image : b2dObject {
  // class Image {
    uint create(int w, int h, uint pixelFormat);
  }
}

The linke complains about missing symbols:

error LNK2001: "public: virtual bool __cdecl b2d::AnyBase::isShared(void)" (?isShared@AnyBase@b2d@@UEBA_NXZ) error LNK2001: "public: virtual unsigned int __cdecl b2d::Image::create(int,int,unsigned int)" (?create@Image@b2d@@UEAAIHHI@Z)

I have in my C++ link lib:

?isShared@AnyBase@b2d@@QEBA_NXZ which demangles to => public: BOOL __cdecl b2d::AnyBase::isShared(void)const __ptr64

So, the difference is the "virtual" specifier on the D side, while the C++ mangeling is missing this. I have this for many functions.

Any idea how to handle this?

Answering myself. There is a final keyword missing:

 class Image : b2dObject {
 // class Image {
   final uint create(int w, int h, uint pixelFormat);
 }

With this it's working.

--
Robert M. Münch
http://www.saphirion.com
smarter | better | faster