My experience is that a lot of really old C++ code fails to compile on modern compilers - generally not because of new standards, but because the compiler(s) th

My experience is that a lot of really old C++ code fails to compile on modern compilers - generally not because of new standards, but because the compiler(s) the code was written against didn't enforce the standards of the time properly (especially old versions of GCC). C++ has been around a pretty long time though.