重载私有成员函数的地址

Question

我需要调用某些类的实例的私有方法，
我使用了一个小的代码片段，如果成员没有重载，它可以正常工作，否则它会失败，解决方案是什么以及如何提供重载成员函数的地址？

templates.h

template <class ClassT>
struct AddressHolder
{
     static typename ClassT::PtrPrivateMemFnT address;
};

// init static member
template <class ClassT>
typename ClassT::PtrPrivateMemFnT AddressHolder<ClassT>::address = 0;

template <class ClassT, typename ClassT::PtrPrivateMemFnT x>
struct GetAddress
{
     GetAddress() { AddressHolder<ClassT>::address = x; }
     static GetAddress instance;
};
template <class ClassT, typename ClassT::PtrPrivateMemFnT x>
GetAddress<ClassT,x> GetAddress<ClassT,x>::instance;

的main.cpp

#include "templates.h"

class HidenGems {
    void privateMethod() {std::cout << "hey1\n";}
    void privateMethod2(int) {std::cout << "hey2\n";}
    void privateMethod2(int,int) {std::cout << "hey2\n";}
};


struct PrivateMethod_TypeHolder {
    typedef void(HidenGems::*PtrPrivateMemFnT)();
};
struct PrivateMethod2_TypeHolder {
    typedef void(HidenGems::*PtrPrivateMemFnT)(int);
};
struct PrivateMethod2_int_int_TypeHolder {
    typedef void(HidenGems::*PtrPrivateMemFnT)(int,int);
};

template struct GetAddress<PrivateMethod_TypeHolder, &HidenGems::privateMethod>;
template class GetAddress<PrivateMethod2_TypeHolder, &HidenGems::privateMethod2>;
template class GetAddress<PrivateMethod2_int_int_TypeHolder, &HidenGems::privateMethod2>;

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    HidenGems hg;
    (hg.*AddressHolder<PrivateMethod_TypeHolder>::address)();
    (hg.*AddressHolder<PrivateMethod2_TypeHolder>::address)(100);
    (hg.*AddressHolder<PrivateMethod2_int_int_TypeHolder>::address)(100,100);
    return a.exec();
}

我收到了编译信息：

/Users/mac/dummy/main.cpp:29: error: 'privateMethod2' is a private member of 'HidenGems'
template class GetAddress<PrivateMethod2_TypeHolder, &HidenGems::privateMethod2>;

/Users/mac/dummy/main.cpp:30: error: 'privateMethod2' is a private member of 'HidenGems'
template class GetAddress<PrivateMethod2_int_int_TypeHolder, &HidenGems::privateMethod2>;