> On Sun, 12 Jan 2003 14:59:57 EST, Rob Wilkens said:
>
>> In general, if you can structure your code properly, you should never need
>> a goto, and if you don't need a goto you shouldn't use it. It's just
>> "common sense" as I've always been taught. Unless you're
>> intentionally trying to write code that's harder for others to read.
>
> Now, it's provable you never *NEED* a goto. On the other hand, *judicious*
> use of goto can prevent code that is so cluttered with stuff of the form:
>
> if(...) {
> ...
> die_flag = 1;
> if (!die _flag) {...
>
> Pretty soon, you have die_1_flag, die_2_flag, die_3_flag and so on, rather
> than 3 or 4 "goto bail_now;".
Right.
> The real problem is that C doesn't have a good multi-level "break"
> construct. On the other hand, I don't know of any language that has a good
> one - some allow "break 3;" to break 3 levels- but that's still bad because
> you get screwed if somebody adds an 'if' clause....
The one that I used in a previous life was like so. No "while"
or "for" constructs, only "do thisloop forever" with conditionals
all being explicitly coded inside the loop(s). All based on:
do [loopname] [forever];
{block};
end [loopname];
with {block} possibly containing "undo [loopname]".
An unnamed undo just terminates the innermost loop.
Named undo's can be used to terminate any loop level.
~Randy
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This archive was generated by hypermail 2b29 : Wed Jan 15 2003 - 22:00:43 EST