Parent lost, cannot clone program.

Hi Arne.

I get the above error with the following code. Shouldn't that work?

The parent use detector is overzealous...

arne

---

class A { object D(string n) { return C.D(this, E(n));

The problem here is that D has been marked as PROGRAM_USES_PARENT, but is indexed directly from a program (C), so the parent pointer can't be set.

If you change the code to

return C()->D(this, E(n));

it might work.

}

}

class B { inherit A;

array(object) operands;

void create(object ... operands) {
    this_program::operands = operands;
}

}

class C { class D { inherit B;

C (and D) get PROGRAM_USES_PARENT set here because B is found by traversing the compile-time parent pointers of D and C.

As inherits are performed at compile-time (it isn't possible to swap out the inherited B by inheriting the top-level program and overriding B (ie link-time)), this isn't meaningful.

It ought to be rather simple to change so that PROGRAM_USES_PARENT isn't set in this case, but I havn't looked close at it.

    void foo() {
        operands->foo();
    }
}

}

[...]

/grubba