C++ is not cross platform anymore
As of 2019, C and C++ are the only programming languages that are supported by virtually any platforms on the market. For example both iOS and android support compiling C and C++ directly as part of their official IDEs. This is one of the reason why I decided to write my voxel editor Goxel in C99: I wanted to be able to run it on Linux, Mac, Windows, iOS, and now I am working on a Android port as well....