std.socket.Address not allowed in tuples

[Neia Neutuladh]

On Thu, 24 Jan 2019 01:35:57 +0000, Steven O wrote:
> Is there any documentation or examples of how to do that? The
> RedBlackTree documentation gives trivial examples like

You define a function implementing the "less" operation for a pair of 
Tuple!(Address, int) (or whatever you have).

---
alias V = Tuple!(Address, int);
bool less(V a, V b)
{
  if (a[0].classinfo != b[0].classinfo)
  {
    return a[0].classinfo < b[0].classinfo;
  }
  // do something for InternetAddress, Internet6Address, etc
  return 0;
}
---

Then pass that to RedBlackTree:

---
alias VTree = RedBlackTree!(V, less);
VTree tree = new VTree();
---