how to fix lnk2019 errors that occur with any methods of the class from .h with the implementation of methods in .cpp?
I have implemented a class of polynomials (and matrices). I checked the performance of all the methods in a separate sandbox project. After that, I split the class into 2 files. .h and .cpp. I tried to use the methods of the class and it turned out that the lnk2019 error occurs in each one. Earlier, I was able to solve a similar error by adding before the class description (inside .h)lines: