Hi,

I don't like auto<class T> vector<T> because T needs to be present twice. It ceases to be concise once you steer away from one-letter names.

Also what if you don't actually care about T here, but you want the overload to only match vectors? Then you can't use this syntax without needlessly introducing a name.

I'm not married to the particular syntax I suggested to the two separate proposals, but I think if still has merit two handle the two cases separately.