Lecture 18: Polymorphism

Programs Shown:

• Box class: Box.h, Box.cpp, boxtest.cpp and boxtest.txt.

• Cube class: Cube.h, Cube.cpp, cubetest.cpp, and cubetest.txt.

• Color cube class: ColorCube.h, ColorCube.cpp,

• Simple use of ColorCube, showing order of construction, destruction, and use of base class methods.
  cctest.cpp, cctest.txt.

• Passing a derived object to a function with base class reference parameters.
  cctest2.cpp, cctest2.txt.

• Passing a derived object to a function with base class value parameters.
  cctest3.cpp, cctest3.txt.

• Same as cctest3.cpp, but bar3() is compiled separately.
  ccsep4.cpp, cctest4.cpp, cctest4.txt.

• Checking out how assignment works, or doesn't.
  cctest5.cpp, cctest5.txt.

• Checking out pointers and dereferencing.
  cctest6.cpp, cctest6.txt.

• C++ lets you do BAAAAD things with arrays of objects.
  cctest7.cpp, cctest7.txt.

• Checking out function overloading and inheritance.
  cctest8.cpp, cctest8.txt.

  Examples of the Box class using virtual identify(). The only change needed is to add the keyword "virtual" to declaration of identify() in the Box class definition: Box.h.

  Some test programs using the virtual identify() function: vtest0.cpp, vtest1.cpp, and vtest2.cpp. Note that the end of vtest2.cpp is a total hack that rewrites the virtual function table pointer of cc to make it point to the base class virtual function table. (Don't do try this at home.)