[Boost-users] [multi-index] member arguments [Was: how to use in herit member as index]

If you're using Boost 1.34, then you can simply use

hashed_unique< tag<userid>, member >

Hi, I'm just curious - is there a reason why "member" takes 3 template parameters, and not just one, like in member<&Peer::userid> ? The first two types can be extracted from the member pointer, so I find this a bit redundant... Thanks, Filip