> In C++ lingo they are called function objects or callables, not functor. The word "functor" has a long and glorious history in C++. Try entering "C++ Andrei

> In C++ lingo they are called function objects or callables, not functor. The word "functor" has a long and glorious history in C++. Try entering "C++ Andrei Alexandrescu functors" into your internet search engine of choice. For bonus points, try "c++ Scott Meyers functor" as well.