???????????????????????????

???????C++????????????????????????????????????????????????????????

???????????????????????????????????????private????????????????????????????????????á??????????????????private??????????????д?????????????????

??????????????????????????????operator new??operator delete?????private?????????new????????????????????????operator new??delete???????????????operator delete??

#include <iostream>
using namespace std;

//????????????????????
class CHeapOnly
{
public:
    CHeapOnly()
    {
        cout << "Constructor of CHeapOnly!" << endl;
    }

    void Destroy() const
    {
        delete this;
    }

private:
    ~CHeapOnly()
    {
        cout << "Destructor of CHeapOnly!" << endl;
    }
};

//????????????????????????????new??????????operator new??л?
class CStackOnly
{
public:
    CStackOnly()
    {
        cout << "Constructor of CStackOnly!" << endl;
    }

    ~CStackOnly()
    {
        cout << "Destrucotr of CStackOnly!" << endl;
    }

private:
    void* operator new(size_t size)
    {
    }

    void operator delete(void * ptr)
    {
    }
};

int main()
{
    //use of CHeapOnly
    CHeapOnly* pHeap = new CHeapOnly;
    pHeap->Destroy();

    //error use of CHeapOnly
    //CHeapOnly objHeap;

    //use of CStackOnly
    CStackOnly objStack;

    //error use of CStackOnly
    //CStackOnly* pStack = new CStackOnly;

    return 0;
}

???????????????????????????????????????????????????????private???????????????static???????????????????????????????е??

#include <iostream>
using namespace std;

//????????????????????
class FinalClass
{
public :
    static FinalClass* GetInstance()
    {
        cout<<"Constructor of the class"<<endl;
        return new FinalClass;
    }

    static void DeleteInstance(FinalClass* pInstance)
    {
        cout<<"Destructor of the class"<<endl;
        delete pInstance;
        pInstance = 0;
    }

private :
    FinalClass() {}
    ~FinalClass() {}
};

int main()
{
    //use of CHeapOnly
    FinalClass* fc = FinalClass::GetInstance();
    FinalClass::DeleteInstance(fc);

    return 0;
}