ProtoObject and comparison for equality and ordering

[Steven Schveighoffer]

On 5/14/19 9:36 PM, Eduard Staniloiu wrote:

> Jonathan's question got us to the point raised: maybe it doesn't make 
> much sense to be able to compare two `ProtoObjects`, so maybe you 
> shouldn't be able to. This would change the interface to
> ```
> interface Ordered(T)
> {
>      int opCmp(scope const T rhs);
> }
> ```
> 
> Now the attributes of `opCmp` will be inferred.

Just wanted to make sure you understand this is not the case. opCmp in 
this instance is a virtual call, and will NOT have attributes inferred.

There isn't really a way to define an interface for this, nor do you 
need to.

Just define the opCmp you want in your own interface/base object, and 
then you can compare those. Almost nobody wants to compare 2 completely 
unrelated objects.

-Steve