Bug 5459 – comparison of interfaces not implemented

Currently, object.di's global opEquals function does not support comparing interfaces. The following code adds such support, but may add bloat due to duplicated code for all type combinations: /************************ * Returns true if lhs and rhs are equal. */ equals_t opEquals(T, U)(T lhs, U rhs) if ((is(T == class) || is(T == interface)) && (is(U == class) || is(U == interface))) { // If aliased to the same object or both null => equal if (lhs is rhs) return true; // If either is null => non-equal if (lhs is null || rhs is null) return false; // If comparison is supported via opEquals, use it static if (__traits(compiles,{lhs.opEquals(rhs) && rhs.opEquals(lhs);})) { // If same exact type => one call to method opEquals if (typeid(lhs) is typeid(rhs) || typeid(lhs).opEquals(typeid(rhs))) return lhs.opEquals(rhs); // General case => symmetric calls to method opEquals return lhs.opEquals(rhs) && rhs.opEquals(lhs); } else static assert( false, T.stringof ~ " cannot be compared to a " ~ U.stringof ); }

*** This issue has been marked as a duplicate of issue 4088 ***