Operator Overloading in an Abstract Base Class

["Nordlöw" via Digitalmars-d-learn]

On Thursday, 20 November 2014 at 22:35:51 UTC, IgorStepanov wrote:
> class Patt
> {
>     // It is better then your static if.
>     // Compiler will raise better error message for incorrect 
> operator.
>     Seq opBinary(string op)(Patt rhs) if (op == "~")
>     {
>         return opCatImpl(rhs);
>     }
>
>     protected Seq opCatImpl(Patt rhs) //you may override it in 
> derived class
>     {
>         return seq(this, rhs);
>     }
> }

Great! I've update my code! Thanks!