Re: opEquals

[Dan]

On Wednesday, 5 December 2012 at 00:17:05 UTC, deed wrote:
interface I
{
    bool opEquals(I i);
}
class C : I
{
    bool opEquals(I i)
    {
        return true;
    }
}

void main()
{
    I i1 = new C;
    I i2 = new C;
    assert(i1 == i2);  // Assertino failure
    assert(i1 != i2);  // Passes, although it's the opposite of 
what I want..
}

What's missing?

It looks like you want the opEquals to be called and it is not. 
Match the signature of it to what is in object.di. This may be 
what you want.
----------------------------------

import std.stdio;
interface I
{
  bool opEquals(Object i);
}

class C : I
{
  override bool opEquals(Object i) const
  {
    writeln("Called");
    return true;
  }
}

void main()
{
  I i1 = new C;
  I i2 = new C;
  writeln(i1 == i2);
  writeln(i1 != i2);
}