C++Now 2019

This talk will present the current state of my work on designing and implementing Physical Units Library for C++. I will present all the challenges, design tradeoffs, and potential solutions to those problems. During the lecture, we will also see how new C++20 features help to make the library interface easier to use, maintain, and extend. Among others, we will see how we can benefit from class types provided as non-type template parameters, how new class template argument deduction rules simplify the interfaces and the full power of using concepts to constrain template types.