Part 1 Part 2 Part 3 Part 4 Part 5 Postscript Callable things. There are several types: functions member functions std::functions bind expressions lambdas objects that support operator() (function objects) So, going back to my tag code, so far (with everything I’ve added) and including callable things, it will look like: template using stringifier_tag = … Continue reading How to print anything in C++ (part 4)