C / C++ / MFC

class ClassTest1 {};
class ClassTest2 {};

// Base class
class JSBase
{
public:
	JSBase() {};
	virtual ~JSBase() {};

	virtual void import(ClassTest1 Data) {};
	virtual void import(ClassTest2 Data) {};
};

// Derived class
class JSDerived : public JSBase
{
public:
	JSDerived() : JSBase() {};
	~JSDerived() {};

	void import(ClassTest2 Data) {};
};

// Main
void main(int argc, char* argv[])
{
	JSDerived MyDerived;
	ClassTest1 MyData;
	MyDerived.import(MyData);
}