This is a very necessary collection of pieces of working code, for the possible simplification of life.
The author does not in any way pretend to the purity of implementation and fidelity of execution. Therefore, if you think that you can do it differently, then please do it. I will be very grateful to you for PR.
Please see example for implementation by /bin/main.cpp
Tests are written according to necessity and the presence of the right mood!!!
But you can always fix it. :)