gistfile1.h

class Inner
{
    float a;
    float b;
};

class Outer
{
    Inner myInner;
  public:
    void updateInner(Inner & newInner); 
};

void Outer::updateInner(Inner & newInner)
{
    this->myInner = newInner; /* does this work OK? what happens to the memory that used to
                               * hold the original myInner?
                               */
}