While not usable in practice, it was well written educational piece. Thank you! Took me a while to compile (gcc 4.8.3 on cygwin64, had to add -std=c++11 -fperm

While not usable in practice, it was well written educational piece. Thank you! Took me a while to compile (gcc 4.8.3 on cygwin64, had to add -std=c++11 -fpermissive)