Question

I have a somewhat complex range I want to assign to a data member of a class.

chain(nicklist,
      map!(a=>format("%s%d", nicklist[0], a))(sequence!"n+1"()))

nicklist is just a string[]. Normally my trusty friend auto would just take care of this but for a data member I need to declare the type and I’m at a loss for what that type should be. I’ve tried to figure out how to use typeof() to get it but the runtime arguments confuse me and I haven’t been able to figure out how to formulate it.

(this is being used for an IRC bot. nicklist is a list of nicks I want it to try in order and after it has exhausted all of those with nick collisions it’ll just try the first nick with numbers appended)

Answer 1

This would work:

typeof(chain(cast(string[])[], map!(a=>format("%s%d", "", a))(sequence!"n+1"()))) memberVar;

Another possibility would be to have a function wrap it and then take its return type and use that:

auto func(string[] nicklist)
{
    return chain(nicklist,
                 map!(a=>format("%s%d", nicklist[0], a))(sequence!"n+1"()));
}

ReturnType!func memberVar;

ReturnType is in std.traits.