> but many C++ programmers disable exceptions for performance
I have never seen a project like this for 10+something years. The only piece of code with disabled exceptions that I've seen was created for Atmel controllers. And in modern C++ exceptions is zero-cost. Your paying for exceptions only when they occur so, nobody is disabling exceptions now.
This is not the only line that bugs me but I don't have enough time for it right now.
> On their face, the benefits of using exceptions outweigh the costs, especially in new projects. However, for existing code, the introduction of exceptions has implications on all dependent code. If exceptions can be propagated beyond a new project, it also becomes problematic to integrate the new project into existing exception-free code. Because most existing C++ code at Google is not prepared to deal with exceptions, it is comparatively difficult to adopt new code that generates exceptions.
And most importantly, I don't think that they're disabling exceptions using compiler flag. I'm sure that they just using error codes for error handling instead of exceptions.
Embedded people still disable exceptions.