一个调用问题

thrTransData::thrTransData()
{
    m_spTimerFactory = NEWSP(TimerFactory);

    new std::thread(std::bind(&thrTransData::thread, this));
};

#include <iostream>
#include <functional>
using namespace std;

class A{
public:
    A();
    virtual void fun1(){};
    void fun2();
    std::function<void()> m_heh;
};

A::A()
{
    m_heh = std::bind(&A::fun2, this);
}

void A::fun2()
{
    fun1();
}

class B:public A
{
public:
    void fun1();

private:

};

void B::fun1()
{
    std::cout<<"hhe";
}

int main()
{
    A* p = new B;
    p->m_heh();
    getchar();
    return 0;

}