Re: error handlling in recursive function
- From: David Resnick <lndresnick@xxxxxxxxx>
- Date: Fri, 30 May 2008 06:51:44 -0700 (PDT)
On May 30, 9:22 am, pereges <Brol...@xxxxxxxxx> wrote:
How to to go about this ? Suppose a malloc inside a recursive function
has failed and you want to set the error flag and return it to the
calling function(the one which called the recursive function in the
first place)
Options seem to be:
1) Propagate the flag back through the stack of recursive functions,
checking for it at each invocation. This is the best way if you need
to, say, release resources in each invocation of the recursive
function, which seems possible given that you are mallocing in the
recursion.
2) Use setjmp (before entering recursion) and longjmp to hop back on
error.
n.b. this is a case where exception throwing is nice, as with minimal
fuss it gets you back to the level that wants to handle the error
cleaning up all in between. But as we're in C, not an option
-David
.
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