Undefined reference to `vtable for <class name>'

Questions
1

Hi!
I’d like to have separate files for headers and implementation of my usermod, but whenever I put an implementation into a separate file, I get the error undefined reference to 'vtable for <class name>'.

Example

Bla.hpp 
#ifndef BLA_H
#define BLA_H

class Bla {
    public:
        virtual void Test();
};

#endif
Bla.cpp 
#include "Bla.hpp"

void Bla::Test() { }
In any other file 
#include "Bla.hpp"

Bla bla;

What do I have to do to make it work?

2

I got it now.

I had put all files inside usermods/<modname>, but .cpp files have to be inside wled00.

3

Not a proper solution but that is a shortcoming of WLED folder structure.
Unfortunately moving complete usermods folder under wle00 parent folder would remove all commit history stripping credit of many contributors.

4

It’s for development and compiling only. After that, everything’s gonna be put back into the usermods folder.

I’d be extremely happy if anyone could show me another way. :smiley: