I'm not sure I understand the appeal of C++ exceptions. For years I've been told that Rust and Go's lack of advanced exception support is a crutch; and that error returns or sum types were unimaginative.
Now, in this thread, exceptions are supposed to be used rarely. I don't see the difference between an exception and Rust/Go's `panic`. If the error is rare enough, then chances are you cannot gracefully recover. If the error isn't rare; then why are you using exceptions for control flow?
Exceptions have always supposed to be used rarely - that's the point! The most obvious example is 'new' failing and returning std::bad_alloc. Given that new is implicit all over the place (pushing to a vector for example) the code would get very cluttered if you had to cope with this everywhere, so the pragmatic decision was taken to use exception handling to give apps that cared the chance to deal with them, and those that don't a sensible error message by default when the exception escapes main.
It's interesting that the lack of enforced exception handling was seen as a strength when exceptions were added to the language, compared to now when the lack of enforced exception handling is sometimes seen as a weakness. Programming language design and expectations are a moving target, so it'll be interesting to see how these things develop over time.
And yes, Rust and Go take a different approach. Is there right and wrong? No, i'd say just different approaches which will play to the strengths of some problem domains and coding styles.
> If the error is rare enough, then chances are you cannot gracefully recover.
that does not match my experience. Generally, rolling back to the state at the beginning of whatever user interaction caused the exception is good enough in a large amount of cases and a much better experience for end-users than abort()
Now, in this thread, exceptions are supposed to be used rarely. I don't see the difference between an exception and Rust/Go's `panic`. If the error is rare enough, then chances are you cannot gracefully recover. If the error isn't rare; then why are you using exceptions for control flow?