Reset all Members of a Aggregate Instance

[Nordlöw via Digitalmars-d-learn]

Given

     class C
     {
         // lots of members
     }

and a function

     f(C c)
     {
     }

is there a generic way, perhaps through reflection, to reset 
(inside f) all members of `c` to their default values? Something 
along

     foreach(ref member; __traits(allMembers, c))
     {
         member = typeof(member).init;
     }