On 09 Oct 2015, at 4:33 , Esteban Lorenzano <estebanlm@gmail.com> wrote:

On 09 Oct 2015, at 16:21, Gabriel Cotelli <g.cotelli@gmail.com> wrote:

If the collection implements = using the objects it holds then you need to consider at least some of them in the hash calculation. I can't conceive a hash calculation for this case independent of the contents (well,  just hardcode a number but this will lead to always collide if used as a key in a hashed collection).

it is not :)

I'm with Levente here, I think the hash implementation is reasonable. And I wouldn't use a mutable object as key in a hashed collection.

no idea��� I���m not using it, just arrive to that method random and I cannot understand it. 

I still believe is wrong.