On 12/04/2012 04:12 PM, 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); // Assertion failure
assert(i1 != i2); // Passes, although it's the opposite of what I want...
}
What's missing?
opEquals is a special function of Object but interface's do not inherit
from Object. Just override it on the class:
interface I
{
// ...
// bool opEquals(I i);
}
class C : I
{
int i;
// ...
override bool opEquals(Object o) const
{
auto rhs = cast(const C)o;
return (rhs && (i == rhs.i));
}
}
void main()
{
I i1 = new C;
I i2 = new C;
assert(i1 == i2);
}
What I know about this topic is in the following chapter:
http://ddili.org/ders/d.en/object.html
Ali
--
D Programming Language Tutorial: http://ddili.org/ders/d.en/index.html
