how to do this meta-programming? print the address of random element's address of a variable length of arrays?

[Paul Backus]

On Saturday, 12 September 2020 at 18:16:51 UTC, mw wrote:
> Now, let me expand this challenge: suppose we need to add a new 
> set of variable length extra parameters in parallel to the 
> arrays, i.e:
>
> [...]
>
> Now the question is how to pass & handle 2 sets of variadic 
> parameters?

void fun(Args...)(Args args)
     if (args.length % 2 == 0)
{
     alias firstSet = args[0 .. $/2];
     alias secondSet = args[$/2 .. $];

     // rest of function body goes here
}

You will probably also want to include some `static asserts` to 
make sure each set contains arguments of the appropriate types.