friend template class

[trim shoal]

app.hpp

template <class RenderEngine = Renderer>
requires RendererTemplate<RenderEngine>
class Application {
  protected:
    Timer timer;
};

timer.hpp

class Timer {
  friend class Application;
};

Error: Redefinition of 'Application' as different kind of symbol (clang redefinition_different_kind)
how do I fix this?

[cursive yacht]

When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question run !howto ask.

[trim shoal]

I tried writing class as template

class Timer {
  template <class RenderEngine = Renderer>
requires RendererTemplate<RenderEngine>
class Application;
};
```but Isn't working either

template <class RenderEngine> requires RendererTemplate<RenderEngine> friend  class Application;
``` worked

!solved