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;
    }