“X是Y的模糊基”:多重继承噩梦

Track 有四个实例 IConnectableTrack 编译器不知道使用哪一个。使前3个箭头为虚拟箭头。

https://wandbox.org/permlink/Y1e9LwDI0IVaERaW

class IConnectableTrack {};
class Object {};
class ConnectableTrack: public virtual IConnectableTrack, public Object {};
class IOccupiableTrack: public virtual IConnectableTrack {};
class OccupiableTrack: public IOccupiableTrack {};
class ISignalledTrack: public virtual IConnectableTrack {};
class SignalledTrack: public ISignalledTrack {};
class Track: public OccupiableTrack, public SignalledTrack {};

void f(IConnectableTrack&) {}

int main() {
    Track t;
    f(t);
}