class base
{
public:
     base():size(), p_array(0){}
private:
     size_t size;
     boost::shared_array<unsigned char> p_array;

};

class derived
{
public:
     derived(size_t array_size):size(array_size)
     {
          p_array.reset(new unsigned char[size]);
     }
};

p_array.reset(new unsigned char[size]);

class base
{
public:
     base():size(), p_array(0){}
     base(size_t array_size):size(array_size)
     {
          p_array.reset(new unsigned char[size]);
     }
private:
     size_t size;
     boost::shared_ptr<unsigned char> p_array;

};

class derived
{
public:
     derived(size_t array_size):base(array_size)
     {
     }
private:
};

class base
{
   base(size_):size(size_), p_array(new char[size_]) {}
}

class largebufferderived : public base
{
   public:
     largebufferderived() : base(77220) {}
}

boost::shared_ptr<char> Buffer()
{
   if (!p_Array)
     p_array.reset(new unsigned char[size]);
}