Undefined reference to class constructor, including .cpp file fixes

Question

The problem I am having is that, when I call a constructor for a class I have created I get the following error.

main.cpp:20: undefined reference to

Answer 1

I had the same issue in Qt, where I forgot to add the class to the pro file. Apparently, without adding it to the pro file, the compiler doesn't recognize it. So I added it in, and then ran qmake again, and that silved the problem.

Basically, you need to add the file in the sources.