How to test if Qore object is inherited from a specific class

Question

When I have more classes, how can I test if instance is derived from a class?

class a {
};
class b inherits a {
};
class c inherits b {
};


a B = new b();
a C = new c();
assert ((B is instance_of b) == (C is instance_of b))

Ugly hack is testing B.className == 'b' but it is wrong for 'C'. I cannot find an operator.

Answer 1

use the instanceof operator:

class A {
}
class B inherits A {
}
class C inherits B {
}

A a();
B b();
C c();

printf("%y %y %y\n", a instanceof B, b instanceof B, c instanceof C);

prints: False True True

(the code above is based on your code but follows Qore's standard naming conventions and was also corrected for syntax errors)