#include<iostream>
using namespace std;
#define METHOD_PROLOGUE(theClass,localClass) \
theClass* pThis = ( (theClass*)((char*)(this) - \
offsetof(theClass,m_x##localClass)) );
class Outer
{
int o_a;
int o_b;
public:
Outer(){o_a=0;o_b=0;cout<<"Outer()"<<endl;}
virtual void print();
class InnerA
{
private:
int i_a;
int i_b;
public:
InnerA(){i_a=1;i_b=1;cout<<"InnerA()"<<endl;}
virtual void print();
}m_xInnerA;
class InnerB
{
private:
int i_a;
int i_b;
public:
InnerB(){i_a=2;i_b=2;cout<<"InnerB()"<<endl;}
virtual void print();
}m_xInnerB;
friend class InnerA;
friend class InnerB;
};
void Outer::print()
{
//cout<<"o_a="<<o_a<<",o_b="<<o_b<<endl;
cout<<"Outer::vptr=="<<this<<endl;
cout<<"the address of Outer:: o_a="<<&o_a<<",add of o_b="<<&o_b<<endl;
}
void Outer::InnerA::print()
{
METHOD_PROLOGUE(Outer,InnerA)
cout<<"InnerA::vptr=="<<(Outer*)(char*)(this)<<endl;
cout<<"(Outer::vptr)pThis="<<pThis<<endl;
cout<<"the address of Outer::InnerA::i_a="<<&i_a<<",add of i_b="<<&i_b<<endl;
//cout<<"o_a="<<pThis->o_a<<",o_b="<<pThis->o_b<<endl;
//cout<<"i_a="<<i_a<<",i_b="<<i_b<<endl;
}
void Outer::InnerB::print()
{
METHOD_PROLOGUE(Outer,InnerB)
cout<<"InnerB::vptr="<<(Outer*)(char*)(this)<<endl;
cout<<"(Outer::vptr)pThis="<<pThis<<endl;
cout<<"the address of Outer::InnerA::i_a="<<&i_a<<",add of i_b="<<&i_b<<endl;
//cout<<"i_a="<<i_a<<",i_b="<<i_b<<endl;
}
int main()
{
Outer mOb;
cout<<"the address of mOb="<<&mOb<<endl;
mOb.print();
cout<<"the address of mOb.m_xInnerA="<<&(mOb.m_xInnerA)<<endl;
cout<<"offsetof(Outer,m_xInnerA)="<<offsetof(Outer,m_xInnerA)<<endl;
mOb.m_xInnerA.print();
cout<<"the address of mOb.m_xInnerB="<<&(mOb.m_xInnerB)<<endl;
cout<<"offsetof(Outer,m_xInnerB)="<<offsetof(Outer,m_xInnerB)<<endl;
mOb.m_xInnerB.print();
return 0;
}
