No Return

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Your title is perfect! What about a function such as execve that shouldn't return but could? Should it have the noreturn attribute?

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No, it shouldn't -- if there is a possibility for control flow to return to the caller, it must not have the noreturn attribute. Thompson If a call to a noreturn function is wrapped in a try-block, any code from the catch block on will count as reachable again.

So it's not impossible to return, just abnormal. That's useful. Thompson no, it's impossible to return. Throwing an exception is not returning, so if every path throws then it's noreturn. Handling that exception is not the same as it having returned.

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Any code within the try after the call is still unreachable, and if not void then any assignment or use of the return value will not happen. Stephen Canon Stephen Canon TemplateRex: Compile with -Wno-return and you will get a warning. Probably not the one you were expecting but it is probably sufficient to tell you that the compiler has knowledge of what [[noreturn]] is and it can take advantage of it.

I am a bit surprised that -Wunreachable-code did not kick in TemplateRex: Sorry -Wmissing-noreturn , the warning implies that flow analysis determined that the std::cout is not reachable. Here's an assembly dump -S -o - flags in coliru , indeed drops the "unreachable" code. Interestingly enough, -O1 is already enough to drop that unreachable code without the [[noreturn]] hint. TemplateRex: All of the code is in the same translation unit and visible, so the compiler can infer the [[noreturn]] from the code.

the point of no return

If this translation unit only had a declaration of the function that was defined somewhere else, the compiler would not be able to drop that code, as it does not know that the function does not return. That is where the attribute should help the compiler. All the other examples listed use void functions -- how does it work when you have both the [[no return]] directive and a non-void return type? Does the [[no return]] directive only come into play when the compiler gets ready to warn about a possibility of not returning and ignore the warning?

For example, does the compiler go: "Okay, here is a non-void function. Should I warn the user? Feb 15 at The noreturn function in my example is not f , it's abort. It doesn't make sense to mark a non-void function noreturn. A function which sometimes returns a value and sometimes returns a good example is execve cannot be marked noreturn. Elazar Elazar Nothing may be cast to void and void never evaluates to true or false or anything else.

Learn more. First 10 Free. What is the point of noreturn? Ask Question. Asked 7 years, 4 months ago.

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Active 1 month ago. Viewed 28k times. So, what is the point of the noreturn attribute? How is it supposed to be used? Deduplicator What is so important about this kind of funciton that will most likely happen once in a program execution that deserves such attention? Isn't this an easily detectable situation? Given how they're nearly always used in tandem, I think the confusion is justified. Thompson Jun 24 '16 at Your title is perfect!

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What about a function such as execve that shouldn't return but could? Should it have the noreturn attribute? No, it shouldn't -- if there is a possibility for control flow to return to the caller, it must not have the noreturn attribute. Thompson If a call to a noreturn function is wrapped in a try-block, any code from the catch block on will count as reachable again.

So it's not impossible to return, just abnormal. That's useful. Thompson no, it's impossible to return. Throwing an exception is not returning, so if every path throws then it's noreturn. Handling that exception is not the same as it having returned. Any code within the try after the call is still unreachable, and if not void then any assignment or use of the return value will not happen.

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Stephen Canon Stephen Canon TemplateRex: Compile with -Wno-return and you will get a warning. Probably not the one you were expecting but it is probably sufficient to tell you that the compiler has knowledge of what [[noreturn]] is and it can take advantage of it. I am a bit surprised that -Wunreachable-code did not kick in TemplateRex: Sorry -Wmissing-noreturn , the warning implies that flow analysis determined that the std::cout is not reachable.

Here's an assembly dump -S -o - flags in coliru , indeed drops the "unreachable" code. TripAdvisor has been notified. This property is closed Report incorrect address Suggest edits. Is a headcover required for this place or activity? Yes No Unsure.

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