I have the following in C++:

class Base
{
public:
    void Foo() { ... }
};

class Derived : public Base
{
};


I then bind these types as follows:

RegisterObjectType("Base",     0, asOBJ_REF | asOBJ_NOCOUNT);
RegisterObjectType("Derived",  0, asOBJ_REF | asOBJ_NOCOUNT);

RegisterObjectMethod("Base", "void Foo()", asMETHODPR(Base, Foo, (), void), asCALL_THISCALL);

RegisterObjectBehaviour("Base", asBEHAVE_REF_CAST, "Derived@ f()", asFUNCTION((refCast<Base,Derived>)), asCALL_CDECL_OBJLAST);
RegisterObjectBehaviour("Derived", asBEHAVE_IMPLICIT_REF_CAST, "Base@ f()", asFUNCTION((refCast<Derived,Base>)), asCALL_CDECL_OBJLAST);

Then in script I have the following:

void main(Derived& d)
{
  d.Foo();
}

I expect the registered implicit conversion to apply to 'd' and call (in C++) d.Foo(), which should resolve to Base's Foo(). However, I get the following compilation error:

No matching signatures to 'Derived::Foo()'

Am I doing anything wrong with how I'm registering the implicit cast? Or would it only take effect for assignment/function params/etc and not what I'm trying to do?

Thank you very much.

Thank you very much - I ended up doing something similar.