Finishing Chapter 10 (for now at least)

• Some notes to clean up:
• An Example:
• Let's look at HumanT.h
• Let's look at HumanT.cpp
• Let's look at HumanTest.cpp
• Some notes:
  • While I only had one or two virtual methods, this is a clear pattern.
  • The base class is pure virtual.
• The final directive means you can't derived any further.
• The SingingCardUserT is an instance of the diamond problem, or Multiple Inheritance
  • Notice there are several hoops I need to jump through to handle the ambiguous base class.

  • // in HumanT.cpp
    string SingingCardUserT::Greet() const {
        return "Hello, I am a SingingCardUserT named " + SingerT::name
               + " but I am also named " + CardUserT::name +"." ;
    
    ...
    // in HumanTest.cpp
    humans.push_back(new CardUserT{"Ed"});
    humans.push_back(static_cast (new SingingCardUserT{"Fran"}));
    

  • Also note the strange name problem in the output.
  • Your author sates that multiple inheritance can be overcome by composition.
  • With virtual base classes (discussed on 389) you can overcome this problem.
• The next part of the chapter has some special cases.
  • You need practice with simple inheritance first.
• Non-public inheritance is discussed on 388.
• Casts are discussed on 390.