Erik Andersen wrote:
> > Does any body how to use long jump in c/c++, I have a
> > program that parse a hierachy structured bitstream, its
> > call nested very deep, so I want to get back to the main
> > instead of check error in each of the nested function and
> > return one by one.
>
> Something like this:
>
> #include <stdio.h>
> #include <setjmp.h>
>
> jmp_buf errorhandler;
> #define FAIL(why) fprintf(stderr, why); longjmp(errorhandler, 1)
Ouch. If someone decides to write:
if (...)
FAIL(...);
the result won't be what they expect, and the bug could be fairly hard
to find. The usual solution is to use something like:
#define FAIL(why) do {fprintf(stderr, why); longjmp(errorhandler, 1);} while (0)
which is a single statement, and so doesn't have this problem.
--
Glynn Clements <[EMAIL PROTECTED]>
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