This is absolutely untrue. Look at how libpng handles exceptions. It uses setjmp. Look at how FreeTDS handles errors. It allows you to define a function pointe

This is absolutely untrue. Look at how libpng handles exceptions. It uses setjmp. Look at how FreeTDS handles errors. It allows you to define a function pointer to handle error cases. Yes you can throw return codes down through each layer but there are lots of other ways to build in exception like handling as well.