Exhaustive switch statements are switch statements that do not have the default case because all possible values of the type in question have been ...
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There's nothing special about scoped
enums or C++ insofar asswitchis concerned. Everything you said applies equally well to unscopedenums in both C++ and C.FYI, see here and here.
Fair point. Having said that, except for legacy code, there are not many scenarios where I would prefer unscoped enums over scoped enums in C++.
Sure, but your whole point was about exhaustive switch statements that don't care about whether
enums are scoped or not.Until you mentioned, I incorrectly assumed that exhaustive switch statements worked only with scoped enum types. Thank you for making me aware that it is not the case. I updated the post to remove the reference to scoped enum types.
btw. your posts about C++ are incredibly comprehensive!
The warnings are about compiler quality-of-implementation. They have nothing to do with what either the C or C++ standards mandate.
I feel that anything less does a disservice to the reader. Even if there were a case where I didn't want to discuss a particular facet of something, I'd at least mention it so the reader knows its exists and can look elsewhere for more information.
After your change, you might consider mentioning that exhaustive switch statements apply to unscoped enumerations as well — and also apply in C.
I changed the first paragraph to call out that exhaustive switch statement can be used for both, scoped and unscoped enum types. I think I will skip the C part.
It's worth mentioning that this is true only for Clang.
With GCC, the first code raises a warning (
warning: control reaches end of non-void function [-Wreturn-type]) and the option-Wswitch-enummust be added if you want to be warned when a new value is added to theenum.See here
Thanks for pointing this out! I updated the post to include this information.
To be honest, Clang behavior seems much better to me 😅
Agree. There is no world I wouldn't want to have this switch on.