Remove algo logic duplication Round 3

[Marc Glisse]

On Mon, 23 Sep 2013, François Dumont wrote:

>    Here is a new version of the patch.

And I was almost getting used to the idea we would use less<void> ;-)

I didn't read it in details, but I'll ask a question anyway, because I am 
a pain that way: did you check how much more we are copying iterators and 
predicates in this new code compared to the old one? I know those 
operations aren't supposed to be super expensive, but still...

I was wondering if we should mark the predefined ops as inline to help the 
compiler early-inline them and make it more likely it will generate the 
same code as before, or if that may prevent the compiler from doing even 
better choices. Probably not worth the trouble.

-- 
Marc Glisse