1. Inheritance & Destructors

2. Constructing/Destructing
Object built/destroyed in layers
Base class constructed
Derived class constructed
Geometric Object
Circle

3. Constructing/Destructing
Object built/destroyed in layers
Base class constructed
Derived class constructed
Derived class destroyed – clean up after itself
Geometric Object

4. Constructing/Destructing
Object built/destroyed in layers
Base class constructed
Derived class constructed
Derived class destroyed – clean up after itself
Base class destroyed – clean up after itself

5. Example Simple list has array of ints
LessSimpleList is a SimpleList with one extra char on heap
Each new has a matching delete

6. Example
Base created Derived created Derived destroyed Base destroyed 1 5 3 2 4

7. Example
Base created Derived created Derived destroyed Base destroyed 1 5 3 2 4

8. Copy Constructor Issue
No copy constructor = trouble:

9. Copy Constructor Issue
Copying child class defaults to no-arg construction of parent:

10. Copy Constructor Fix
Child copy ctor should explicitly call parent one

11. Assignment Operator
Assignment operator also needs to call parent version:

12. Virtual Messiness
Also need to worry about virtual dispatch to handle: SimpleList* list = new LessSimpleList(); delete list;
Fixes:
Virtual destructor
Child classes need to override parent Copy/Assignment