std.socket.Address not allowed in tuples

[Steven O]

On Wednesday, 23 January 2019 at 16:30:33 UTC, Neia Neutuladh 
wrote:
> As always, it helps a lot to post the error message the 
> compiler gave you.

Sorry about that.

> The issue is that Address doesn't have a comparison operator 
> defined, so the resulting tuple type can't be compared with the 
> standard operators. You need to define your own function for 
> comparing the tuples in question and pass that to RedBlackTree.

Is there any documentation or examples of how to do that? The 
RedBlackTree documentation gives trivial examples like

auto maxTree = redBlackTree!"a > b"(iota(5));

but, that doesn't really help me figure out how to do something 
more complex.