Re: [xml] xmlHashScanner type ought to return a bool...

On Thu, Jan 25, 2007 at 02:52:10PM -0600, David Hagood wrote:
I'd like to suggest that the various xmlHashScan functions be modified so
that the function pointer passed to them can return a bool indicating
whether the scan should continue or not.

I have a case where I have to basically reverse a hash scan - given
something about the data hashed, locate a string that maps to that data.

So what I might have is:

struct something
   int a;
   int b;

and a hash mapping a bunch of strings to different instances of something.
Now, I want to find a string which maps to a "something" with a .a value
of 12.

Now, unless I have some other entity besides the hash which lists all the
possible somethings, the only way to find a "something" with .a=12 would
be to create a hash scanner function that checks each item in the hash and
records the first item which has .a=12 - but then I am going to iterate
over the whole rest of the hash after having found my object.

If the hash scanner function could return TRUE = (continue scanning) or
FALSE = (stop scanning), then I could stop the search when I've found the

  That would be a good idea, except it break both API compatibility and
ABI compatibility with previous versions, so that's just impossible. And
I'm not sure it's worth adding a new API at this point. 


Red Hat Virtualization group
Daniel Veillard      | virtualization library
veillard redhat com  | libxml GNOME XML XSLT toolkit | Rpmfind RPM search engine

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