Myron Alexander wrote:
> I was in the process of writing the enhancement request when I had a quick peek at the documentation. The operator overloading document specifically allows for overloading the in operator with opIn and opIn_r (although doesn't say how it is supposed to be used). This got me thinking, is this an enhancement request, or a bug fix request?

You can only overload operators on structs and classes (and perhaps unions). You can't overload operators purely on built-in types and arrays.

(You /could/ overload it separately for every aggregate type you implement, but then it still won't work for arrays of primitive types, or arrays of arrays)

Frits van Bommel wrote:
> Myron Alexander wrote:
>> I was in the process of writing the enhancement request when I had a quick peek at the documentation. The operator overloading document specifically allows for overloading the in operator with opIn and opIn_r (although doesn't say how it is supposed to be used). This got me thinking, is this an enhancement request, or a bug fix request?
> 
> You can only overload operators on structs and classes (and perhaps unions). You can't overload operators purely on built-in types and arrays.
> 
> (You /could/ overload it separately for every aggregate type you implement, but then it still won't work for arrays of primitive types, or arrays of arrays)

Hello Frits.

I am not sure how to use the in operator. I tried to overload it in a class and struct but received a compiler error. This is the code I tried:

struct A {
   int opIn (char[] val) {
      return true;
   }
}

void main () {
   A a = A ();

   if ("hello" in a) {
      printf ("It's alive\n");
   }
}

The compiler error I received:
inop.d(10): Error: rvalue of in expression must be an associative array, not A

How do I overload the in operator?

Thanks ahead,

Myron.

"Myron Alexander" <dprogramming@myron.RMVETHISalexander.com> wrote in message news:f0tona$38c$1@digitalmars.com...
>    int opIn (char[] val) {
>       return true;
>    }

Change it to opIn_r and it will work.  (Personally I think the forward and reverse overloads should be switched, but whatever)

Jarrett Billingsley wrote:
> Change it to opIn_r and it will work.  (Personally I think the forward and reverse overloads should be switched, but whatever) 
> 
> 

Thanks Jarrett, works now.