Advanced C++ Topics

Nested Classes and Name Spaces

The definition of the member functions requires references to both the outer and inner classes.
```
List::Iterator::Iterator()
{
   ...
}

string List::Iterator::get() const
{
   ...
}
```
Note that the name of constructor is just Iterator.
In general, use nested classes for just one reason: to place the name of a class inside the scope of another class.