Messages in this thread | | | Date | Sun, 22 Dec 2002 21:12:23 +0100 | From | DervishD <> | Subject | Re: A little explanation needed |
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Hi Joshua :)
> In otherwords, what's the use of a do{X}while(0) "loop" instead of > just X. I'm not the world's best trained C programmer, so forgive > me if I sound stupid.
First, you do not sound stupid at all.
Second. The do...while use in macros is to avoid the 'swallow semicolon' effect ;)) In other words, it makes the entire macro appear as a single statement. This avoids problems with 'else' constructs with macros that expand to multiple statements.
Someplace in the GNU cpp documentation you can find a far better explanation of this effect and why the do...while helps (it makes the macro a single statement...).
Hope that helps :) Raúl - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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