这是我之前问过的一个问题的第 2 部分:是否可以在 C++ 中进行多态成员重载?
使用 Wiki 示例我创建了这个示例。 http://en.wikipedia.org/wiki/Double_dispatch
我的问题是编译后的代码从不查找 vtable,并且总是使用基类而不是继承类。这是我的代码:
#include <iostream>
class xEntity;
class xVehicle;
class xMapObject
{
public:
virtual void Bump(xMapObject&) { std::cout << "MapObject Bump MapObject\n"; };
virtual void Bump(xEntity&) { std::cout << "MapObject Bump Entity\n"; };
virtual void Bump(xVehicle&) { std::cout << "MapObject Bump Vehicle\n"; };
};
class xEntity : public xMapObject
{
public:
virtual void Bump(xMapObject&) { std::cout << "Entity Bump MapObject\n"; };
virtual void Bump(xEntity&) { std::cout << "Entity Bump Entity\n"; };
virtual void Bump(xVehicle&) { std::cout << "Entity Bump Vehicle\n"; };
};
class xVehicle : public xEntity
{
public:
virtual void Bump(xMapObject&) { std::cout << "Vehicle Bump MapObject\n"; };
virtual void Bump(xEntity&) { std::cout << "Vehicle Bump Entity\n"; };
virtual void Bump(xVehicle&) { std::cout << "Vehicle Bump Vehicle\n"; };
};
int main(int argv, char **argc)
{
xEntity Entity;
xVehicle Vechile;
xMapObject &EntityRef = Entity;
xMapObject &VehicleRef = Vechile;
VehicleRef.Bump(EntityRef);
return 0;
}
但是,输出始终是:
Vehicle Bump MapObject
非常感谢您对这个谜团的任何帮助。