[0xQSL]

It can be used with constexpr (http://en.cppreference.com/w/cpp/language/constexpr) to precompute values at compile time.

Here are some videos on the topic: https://www.youtube.com/watch?v=PJwd4JLYJJY https://www.youtube.com/watch?v=rpn_5Mrrxf8