Re: [xml] knowing when cur is still valid?

[Daniel Veillard <veillard redhat com>]

On Fri, Aug 02, 2002 at 04:29:36PM -0700, Rick Jones wrote:
> I was perusing the tree documentation, and came across a number of
> entries such as this:
>
> <excerpt>
> xmlAddChild ()
>
> xmlNodePtr  xmlAddChild                     (xmlNodePtr parent,
>                                              xmlNodePtr cur);
>
> Add a new node to parent, at the end of the child (or property) list
> merging adjacent TEXT nodes (in which case cur is freed) If the new node
> was already inserted in a document it is first unlinked from its
> existing context. If the new node is ATTRIBUTE, it is added into
> properties instead of children. If there is an attribute with equal
> name, it is first destroyed.
>
> parent : the parent node
> cur : the child node
> Returns : the child or NULL in case of error.
> </excerpt>
>
> I've naievely assumed that cur would be an xmlNodePtr I have allocated
> and filled-in with everything of interest. If cur is possibly freed by
> xmlAddChild, how will I know whether or not it is still OK to access or
> free cur?

  if the xmlNodePtr returned is different than cur, then it means that
you cannot access cur anymore (you don't need to free it either).

Daniel

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