Chain two different struct specialization

[Andrea Fontana]

I'm trying to do something like this. I don't know whether or not 
it's a good idea, i'm open to solutions and suggestions

struct MyStruct(WEIGHTS)
{
    string ...
    string ...

    alias WEIGHTS weights;
}

double likeness(T,T1)(ref in T1, ref in T2)
{
     // Here i do some complex calculus using struct fields
     // and using weights consts
}

enum FirstWeights : double
{

}