Cool library. Any thoughts on getting it to work with Visual C++ 2015. It now has pretty decent C++11 support, you already use CMake, and this library seems like something that is inherently OS neutral. Even when I am ultimately deploying on Linux, I will often develop and debug my os-independent logic using Visual C++ on Windows and then when that is working well, recompile using g++ or clang++.
We are working on VS support. Last time we tried to port to VS some of the constexpr stuff we use was not available yet. The next release (in 1-2 month) should have full VS2015 support.
Um...is that legal? Nothing in VS is licensed GPLv3.