One of the biggest users (some would say abusers) of template metaprogramming I know works on HFT software. He trades extremely long compile times for performan

One of the biggest users (some would say abusers) of template metaprogramming I know works on HFT software. He trades extremely long compile times for performance at runtime and finds that C++ allows him to do this and maintain a decent architecture (through what amounts to compile-time polymorphism as well as RAII). For him, it's actually the older features of C++ that have no use. He doesn't use deep class inheritance and never touches virtual functions, for example.