On Monday, April 30, 2012 07:09:46 Era Scarecrow wrote:
> In some code I'm working on, my asserted when I've confirmed it
> was correct. With the opCmp() overridden. 'this' refers to the
> current object, so why doesn't the first one succeed?
>
> class X {
> int z;
>
> this(int xx) {
> z = xx;
> }
>
> override int opCmp(Object y){
> X x = cast(X) y;
> return z - x.z;
> }
>
> void something(X rhs) {
> assert(this.opCmp(rhs) == 0); //works fine.
> assert(this == rhs); //fails?
> }
> }
>
> int main(){
> X a = new X(10);
> X b = new X(10); //different objects, same compare value
> a.something(b);
> return 0;
> }
== uses opEquals, not opCmp. It's using Object's opEquals, which does a
comparison of the references, so it's true when comparing the exact same
object and false otherwise.
- Jonathan M Davis
