Patch to allow finding the position of a nonempty_iterator

[GoogleCodeExporter]

Hi!

It's useful when scanning over a table with the nonempty_iterator to be able to 
calculate the current position of the iterator in the table. Simple API:

sparsetable<int> table(100);

// Add things to table

for (sparsetable<int>::nonempty_iterator it=table.nonempty_ 
begin(),ite=table.nonempty_end();it!=ite;++it){
   int pos = table.get_pos(it);
  // Do stuff with pos
}

Attached a patch, plenty of room for optimisation by removing branch perhaps? 
The repetition of bits_in is a bit cumbersome too. Not sure how to place that 
outside of a static function...

Let me know if you what any changes!

Cheers,
Donovan.

Original issue reported on code.google.com by DonovanH...@gmail.com on 10 Jul 2011 at 6:22

Attachments:

• get_pos.diff

[GoogleCodeExporter]

Oops, missed out the tests. Please refer to this attached diff instead.

Original comment by DonovanH...@gmail.com on 10 Jul 2011 at 6:39

Attachments:

• get_pos.diff

[GoogleCodeExporter]

I'm obviously not very good with attachments!

Please use this one (fingers crossed!)

Original comment by DonovanH...@gmail.com on 10 Jul 2011 at 6:42

Attachments:

• get_pos.diff

[GoogleCodeExporter]

Thanks for the patch!  It looks good to me.  I'll pass it by someone here who 
is good at optimizing to see if they have any recommendations, but I'll look to 
get it into svn-trunk sometime this week.

Original comment by csilv...@gmail.com on 11 Jul 2011 at 10:43

• Changed state: Accepted
• Added labels: Priority-Medium, Type-Patch

[GoogleCodeExporter]

Original comment by csilv...@gmail.com on 12 Jul 2011 at 12:55

• Changed state: Started

[GoogleCodeExporter]

btw, can you please sign the CLA at
   http://code.google.com/legal/individual-cla-v1.0.html
if you haven't already?  Thanks!

Original comment by csilv...@gmail.com on 12 Jul 2011 at 12:57

[GoogleCodeExporter]

That's done, signed and submitted!

Original comment by DonovanH...@gmail.com on 12 Jul 2011 at 1:18

[GoogleCodeExporter]

Fixed in r76

Original comment by csilv...@gmail.com on 26 Aug 2011 at 1:27

• Changed state: Fixed