return -2 : is there a clean way to exit parent function from a nested function?

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Jonas 2015-1-15

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评论： Jonas 2015-1-15

I have a parent function and several nested functions. I would like to be able, in a nested function instead of doing "return" and go back to the parent function, to do some kind of "return-2" and also exit the parent function (not only the nested one).

Is there a clean way to do it?

(I know that I can use some "flag" variable, and then in the parent function have each time "if flag; return", but I want to avoid to have duplicated code, if possible.)

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Geoff Hayes 2015-1-15

Jonas - do you mean nested function or nested loop?

Jonas 2015-1-15

Nested function.

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Answer 1

Image Analyst 2015-1-15

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As far as I know, the flag way you described is the clean way to do it. You dive in and then you bubble back up the reverse direction you went in. To do it any other way, for example a "goto" statement to send you directly to some arbitrary location, would enable "spaghetti code" and is not recommended. Don't worry about putting in 3 or 4 lines - your code might be way longer than that anyway. Anyway, some alternate method of accomplishing what you want would probably be that many lines also.

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John D'Errico 2015-1-15

I could see the idea of a variable return, IF it were possible, as creating far too many bugs with the stack than it is worth. Just like the idea of a goto - a bad idea in terms of code flow, and not really that useful.

Jonas 2015-1-15