指向C++类虚成员函数指针的释疑

指向基类的虚成员函数的指针赋值为基类的虚成员函数地址，如果派生类覆写了基类的对应虚函数，那么当用派生类的对象来调用该虚成员函数指针时，调用的是派生类虚函数！见下面的实例。

#include <iostream>

using namespace std;

class Base
{
public:
	virtual void Func() { cout << "Base Func\n"; }
};

class Derived : public Base
{
public:
	virtual void Func() { cout << "Derived Func\n"; }
};

typedef void (Base::*pFunc_t)();

int main()
{
	void (Base::*pFunc1)() = &Base::Func;
	pFunc_t pFunc2 = &Base::Func;

	Base *pDerived = new Derived;

	(*pDerived).Func();

	(pDerived->*pFunc1)();
	(pDerived->*pFunc2)();

	delete pDerived;

	return 0;
}

输出：

Derived Func
Derived Func
Derived Func