GCE-Math (Generalized Constant Expression Math) is a templated C++ library
enabling compile-time computation of mathematical functions.

Features:
* The library is written in C++11 constexpr format, and is C++11/14/17
  compatible.
* Continued fraction expansions and series expansions are implemented using
  recursive templates.
* The gcem:: syntax is identical to the C++ standard library (std::).
* Tested and accurate to floating-point precision against the C++ standard
  library.
* Released under a permissive, non-GPL license.

WWW: https://github.com/kthohr/gcem