Re: [igraph] Destroying uninitialized graphs

[Matthew Walker]

Hi Gabor, Tamas,

Thanks again for your suggestions.

I cannot help but ask, why isn't this approach available inside igraph?

There could be an igraph_zero() function, that just zero'd the memory 
used in igraph_t.  Such a function would mean that igraph_destroy() 
could then be made safe to call on zero'd graphs.

Thanks again,

Matthew

On 11-03-07 10:34 AM, Gábor Csárdi wrote:
> Matthew,
>
> there is no such function. You need to keep track of that. It is
> actually not possible to write such a function, IMHO, because some
> architectures do not zero out newly allocated memory. Although,
> probably most of the do, nowadays.
>
> What you can do, is filling the igraph_t by zeros after you allocate
> it, and then check whether the 'from' field is zero or not. It should
> not be zero for a valid graph.
>
> Best,
> Gabor
>
> On Mon, Mar 7, 2011 at 10:28 AM, Matthew Walker
> <address@hidden>  wrote:
> > Hi,
> >
> > I currently have a problem in that my program seg faults because I am
> > calling igraph_destroy() on an uninitialized graph.
> >
> > Is there a function to tell whether the graph is initialized?
> >
> > Thanks,
> >
> > Matthew
> >
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