[Templates] Incrementing + outputting a counter value

[Jim Spath]

What is the best way to increment and output a counter value?

Ideally, I'd like to do something like this:

   [% tabindex++ %]

But I can only get it to work by doing this:

  [% tabindex = tabindex + 1; tabindex %]

Is there a better way?  I poked around the docs and couldn't find one.

Thanks!
- Jim