Why is C++ less portable than C? In my experience, non-portable code happens when the interaction with the OS is not well isolated. Since the major OS interfaces are C header files, I don't see why C++ makes it any worse.
I should've clarified: I meant portability of code so that is can be compiled by multiple compilers, VS, clang, gcc. The feature set for C++ is so vast that it's almost certain that you'll write code on for one compiler that doesn't compile on another.
