You will need a compiler that supports C++ 17. I used GCC 7.3.0.
The code can be found on GitHub at https://github.com/PacktPublishing/Hands-On-Functional-Programming-with-Cpp, in the Chapter06 folder. It includes and uses doctest, which is a single header open source unit testing library. You can find it on its GitHub repository at https://github.com/onqtam/doctest.