"is protected within this context" error

From: H. S. (g_reate_xcalibur_at_yahoo.com)
Date: 03/24/05 

Date: Wed, 23 Mar 2005 23:08:16 -0500

I am getting this error if I try to compile the file demarcated below.
What I am missing here? I am using g++ (GCC) 3.3.5 (Debian 1:3.3.5-8).

{tp2}> g++ -ansi -g -Wall tp2.cc -o tp2
tp2.cc: In member function `void Other::DoSomething()':
tp2.cc:11: error: `int Base::iX' is protected
tp2.cc:29: error: within this context

// %< %< ----------------------------------- %< %<
#include <cstdio>
#include <iostream>

class Base{
public:
     Base();

protected:
     int iX;
};

Base::Base():iX(7){}

class Derived:public Base{};

class Other{
public:
     Derived* D;
     void DoSomething();
};

void Other::DoSomething(){
     std::cout << D->iX;
}

int main(){}

// %< %< ----------------------------------- %< %<

Thanks,
->HS 

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