Detection and versioning of operating systems, compilers, architecture and other element are traditionally done using preprocessor macros. Library like Boost.Predef provides a sanitized interface on top of those but still live in a world where the preprocessor is king.
SPY is a C++17 (and onward) library that gathers similar informations and provides a constexpr
compatible interface to access those information, thus making their exploitation within constexpr
context possible.
The complete documentation can be found here.
