On 17 July 2015 at 11:00, Bernd Petrovitsch <bernd@xxxxxxxxxxxxxxxxxxx> wrote:
Hi!
On Fre, 2015-07-17 at 15:55 +0800, Navy wrote:
[...]
> Goto is recommend in linux kernel programming, but it is despised in
> many other situation. There are four rationable for using goto in
"goto" is (usually totally) forbidden for beginners/inexperienced
programmers because some of us are old enough to have started
programming with Basic on the C64 (no functions there - just "goto" and
"gosub") and know what may happen in the long run if you write more than
a hello-world.c ...
My usual answer to "when may or should I use 'goto'" is: You will know
when it's time - before that, simply don't use it.
> Documentation/CodingStyle. Do you have some viewpoints about "why
> goto" or "why not goto"? I'm glad to get your point.
It mainly depends *how* you use it - see the patterns in the kernel for
not so bad ones;-)
And - as others wrote - rewrite the code without 'goto' and look into it
after 3 months and decide which version is more readable/understandable.
BTW that holds for all programming "style advices" (starting from "when
should i factor out a function" over "how large should a function should
be" and "too few or too many comments" to ...).
It is like everywhere else: If the guideline is trivial to check, it is
probably silly anyways.
The big goal in (99,9% of) software development is: You want source code
to be as easy to read and understand as possible - and nothing else!
Coding style guidelines are just that: guidelines in that direction but
never necessary nor sufficient to guarantee that (so the occasional
violation for good reason - which one writes into a comment;-) - is not
evil).
Bernd
This is an interesting article about the history of goto being considered harmful; and how Dijkstra’s paper about it was misunderstood.
http://videlalvaro.github.io/2015/02/programming-myths.html
http://videlalvaro.github.io/2015/02/programming-myths.html
Luis
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