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Computer Science II " Lecture 10O =7Inheritance (Review)Wagner Truppel Lecturer, Dept. of Computer Science & Engineering UC Riverside wagner@cs.ucr.edu http://www.cs.ucr.edu/~wagner http://www.cs.ucr.edu/cs12O  O`a~/ What is it ?Recall that classes can be organized in a hierarchical fashion (figure in next slide) Typically, classes which are more general appear towards the top of the hierarchy More specialized classes have the same member variables and most member functions from their parent classes They may also add member variables and member functions of their own They may also change the behavior of the member functions they get from their parent classes BZ"BJ0  1 AdvantagesGreat organizational structure to help you better design your code  Easy to debug, test, and maintain b/c you do it one class at a time Avoids un-necessary code duplication: all derived classes from a given base class get the same code from it Hierarchies are very expressive structures: lots of real-world stuff may be efficiently organized in hierarchies Allow for common coding patterns to be developed and documented, so that no one has to reinvent the wheel all the time (Design Patterns) Z2Is-a & has-a relationsHow to discover inheritance relations among classes? A Staff person is an Employee; an Employee is a Person A JetEngine is an Engine A Jet is an Airplane, but is not an Engine; a Jet has an Engine The University uses (has) Employees How about this ? a Person is an EmployeeZZ7     n 3C++ inheritance syntax 5C++ inheritance syntaxclass Employee : public Person { private: double salary; public: Employee(string aName, double sal); double getSalary(); }; Employee :: Employee (string aName, double sal) : Person(aName), salary(sal) {}!Z ZZZ8ZTZ      #    R  %  6C++ inheritance syntaxclass TA: public Employee { private: string course; public: TA(string aName, double sal, string crse); string getCourse(); }; TA :: TA (string aName, double sal, string crse) : Employee(aName, sal), course(crse) {}  ?^     $  H       7 ImportantMConstructor chain A constructor of a derived class (TA, Employee) must first call a constructor of its base class (Employee, Person) Why ? Destructor chain Same idea as above, but in the opposite order Why ? An object of a derived class has many types (polymorphism) A TA object is also an Employee object and is also a Person object\ZyZZ4Z;ZCZ"3-               8 Access modifiersoAll member variables are inherited, but not all are necessarily accessible inside the derived class private member vars are not directly accessible by name in the derived class private means: no class other than the one where the member is defined has access to it Can we have members which are directly visible only in derived classes but private for other classes?tdfd2Rfs9 Access modifiersCCan we have members which are directly visible only in derived classes but private for other classes? Yes ! New access modifier: protected protected means: public in derived classes, private for every other class These access modifiers (public, protected, private) apply to member functions as well as to member variables*D: Access modifierszAll member vars and most member functions are inherited, but not all are necessarily accessible inside derived classes private members are not directly accessible by name in any derived class of the class they re defined protected members are directly accessible by name in all derived classes of the class they re defined, but behave as private for all other classes public members are directly accessible by name in all classes, derived or not Constructors, destructors, and the assignment operator are not inherited Private member functions are effectively not inheritedwZGZZw O  ~ <;(  .; Access modifiersclass Person { protected: string name; // rest is the same as before }; class Employee : public Person { protected: double salary; // rest is the same as before }; class TA: public Employee { protected: string course; // rest is the same as before };tZ Z ZZ&Z ZZZ!Z ZZZZ  &       ! ,I <Redefining member fsExtending: just adding a function to a derived class which didn t exist in the base class Overloading: same name, different signatures (old news& ) Redefining: changing the code of an inherited member function; that is, having different functions with the same signature Overriding: redefinition of virtual functions (more on this later)Q Q . b   =Extending class behaviorclass TA: public Employee { private: string course; public: TA(string aName, double sal, string crse); string getCourse(); }; // here s an example of extending a class string TA::getCourse() { return course; }  ?Y +        *bH   = ?Redefining member fs<class Lecturer class Wagner : public Lecturer { { private: private: // stuff // more stuff public: public: // constructor(s) // constructor(s) // stuff // more stuff void teach(); void teach(); }; }; void Lecturer::teach() void Lecturer::teach() { /* do the teaching thing& */ } { /* teach with slides ! */ }JTpJTL#  }  t N  9@Excellent exampleAn excellent example that brings together all this stuff is the partially filled array with backup example from Savitch s book, pp. 608-616 It s good also because it has a major, but subtle, logical mistake First 15 cs 12 students to figure it out and email me the correct explanation get a 20% increase in their next quiz grades The explanation must be on an email having all the usual info about yourself and it must have the subject cs 12 challenge. Make your explanation short and clear. Only until Friday Feb 28 at noonLZZ@"o2$jI>p `VAVirtual functionsSay you have a class Engine, with member functions start() and run() Say that start() calls run() class Engine { public: void start(); void run(); }; void Engine::run() { /* run the engine */ } void Engine::start() { // do some preparatory work // then run the engine run(); }b$F: $F3BVirtual functionsSay you have a class JetEngine, deriving from Engine Say that JetEngine redefines run(), but not start() class JetEngine { public: void run(); }; void JetEngine ::run() { // run at a higher temperature and // using a special fuel }j;     ;P  (  GCVirtual functionsxNow suppose we create an object of class JetEngine and call start() on it JetEngine f18; F18.start(); The question is: which version of run() gets executed? You have a minute to answer& vKZZUZ)  ".,)  hDVirtual functions`Now suppose we create an object of class JetEngine and call start() on it JetEngine f18; F18.start(); The question is: which version of run() gets executed? No, it s not JetEngine s version, even though that s what we d like to happen. It s Engine s run() that gets executed because that s what the compiler knew at the time start() was compiled. Is there a way to make sure it s the JetEngine s version of run() that gets executed? JZZKZ)  " >F4 P)  V  %EVirtual functionsNow, what if it didn t make sense to have run() defined in the class Engine? After all, no one knows how to run an undifferentiated engine Could we still have start() defined there, even though it calls run() and run() isn t defined there anymore? What would be the alternative if the answer was no? Another minute for you to think about it& YZ*U%}FVirtual functions`The answer to both problems It s Engine s version of run() that gets executed when you call start() on a JetEngine object How to have start() be defined and call run() in a class that doesn t itself define run() is to tell the compiler, somehow, to wait until the right run() is available In other words, we need late binding (also called dynamic binding) as opposed to static binding This is accomplished using the keyword virtualNZZNZZ" ';& 'i >GVirtual functionsBy marking run() in Engine as virtual, we re telling the compiler to use the implementation of the caller s class, not the implementation defined where start() was defined class Engine { public: void start(); virtual void run(); }; void Engine::run() { /* run the engine */ } void Engine::start() { // do some preparatory work // then run the engine run(); } ZZ,ZFZ:ZZ s  F3HVirtual functionsNow, when we do JetEngine f18; F18.start(); It s still Engine s start() which gets executed (JetEngine did not redefine start()) But it s JetEngine s run() which gets called from within start() ! How about the other problem? What if it doesn t make sense to have run() defined in Engine? Can we still have start() defined there even though it calls run()?LZZ:Z   G $> E % IVirtual functionsHow about the other problem? What if it doesn t make sense to have run() defined in Engine? Can we still have start() defined there even though it calls run()? Same idea& make run() virtual, but give it no executing body. That is, make it a pure virtual function. class Engine { public: void start(); virtual void run() = 0; // now run() is a pure virtual function }; void Engine::start() { // do some preparatory work // then run the engine run(); }  ZZXZZ:ZZZC $ 4  * 3  JVirtual functionsNow, when we do JetEngine f18; F18.start(); It s still Engine s start() which gets executed (JetEngine did not redefine start()) But it s JetEngine s run() which gets called from within start() since Engine doesn t even have a run() function defined in it. Now& can we try to declare an object of class Engine? Engine eng; // is this possible ? ZZ Z#ZZ   H"> E $ KVirtual functions8Now& can we try to declare an object of class Engine? Engine eng; // is this possible ? It was possible before (even when run() was virtual), but now that run() is pure virtual, it s not possible anymore. Why? Well, what would happen if someone tried to call start() on that object? Engine eng; eng.start(); Which run() function gets executed? There isn t any version available! So& a class having at least one pure virtual function cannot be instantiated. It s then called an abstract class. (Note the italicized name in the UML diagram) 6Z"ZZZZZZ.""[\&  LThe slicing problemRYou cannot slice the cake and eat it too& no, just kidding Ok, say that run() is just virtual, not pure virtual, so that Engine is not an abstract class (it s then called a concrete class) Now let s create some objects. Can we do: JetEngine f18 = Engine(); ? No ! Engine eng = JetEngine(); ? Yes !^CH,.,C, %  MThe slicing problemCan we do: JetEngine f18 = Engine(); ? No ! Of course not. Not every engine is a jet engine. And you can t coerce a general engine into a specific one either& Engine eng = JetEngine(); ? Yes ! Yes, all jet engines are engines, so this works. But& there is a problem. If we do this, we lose the jet engine s identity as a jet engine. It now thinks it s only a regular engine. Its jet-engine-specific member variables and functions are NOT accessible any more. This  memory loss is called the slicing problem Z!ZsZ"Z Z1Z !s"   1,  GN The slicing problemThe correct way to treat a derived class object as an object of its base class is to use pointers Engine* engPtr; JetEngine* jetPtr = new JetEngine(); engPtr = jetPtr; Now we can treat the jet engine as a regular engine without losing the jet engine s identity This is useful sometimes, but I won t go into any more detail Read more in the textbook DbZIZZbIb  O!A really bad ideaSSuppose we have a bunch of animal classes: Dog, Cat, Lion, Sheep, etc Suppose they all have a member function feed(). Suppose we have a bunch of animal objects: Dog fluffy, Dog fang, Cat garfield, Lion lippy, Sheep dolly, and we want to feed them all. Easy, right? fluffy.feed(); fang.feed(); garfield.feed(); lippy. feed(); dolly.feed();  ZJZ+.-    .J,c&P"A really bad ideaYes, but what if we didn t know these animals ahead of time? That is, what if they re created interactively by the user of our program. Not a big deal, right? First, create a base class Animal, from which the others are all derived and have feed() be defined only in Animal // pseudo-code& void Animal::feed() { If (this animal is a Dog) { /* do the dog-feeding thing */ } else if (this animal is a Cat) { /* do the cat-feeding thing */ } else if (this animal is a Lion) { /* do the lion-feeding thing */ } else if (this animal is a Sheep) { /* do the sheep-feeding thing */ } }Z&Z ZZ1 & Q#A really bad ideaFirst, create a base class Animal, from which the others are all derived and have feed() be defined only in Animal // pseudo-code& void Animal::feed() { If (this animal is a Dog) { /* do the dog-feeding thing */ } else if (this animal is a Cat) { /* do the cat-feeding thing */ } else if (this animal is a Lion) { /* do the lion-feeding thing */ } else if (this animal is a Sheep) { /* do the sheep-feeding thing */ } } Bad idea ! What if you later have Zebras, Tigers, Elephants, etc ? You re going to have to search for all these if statements and change them to include the new animals.sZ&Z ZZZ1 &               p  R$ A smart ideaFirst, create a base class Animal, from which the others are all derived and have feed() be a pure virtual function in Animal. Then, have each derived class define its own feeding behavior. Now, you can call feed() on any Animal and the right feeding method will be executed, even if you later define other derived classes from Animal. For example, suppose you have a dynamically allocated array of Animal objects. Then, instead of for (int i = 0; i < size; i++) { if (array[i] is a Dog) { /* feed a dog */ } elseif (array[i] is a Cat) { /* feed a cat */ } // etc etc etc } you simply have for (int i = 0; i < size; i++) { array[i].feed(); }tZ!Zk ZZZ4Z1Q03A!k4PD:,S%A really smart idea$ For example, suppose you have a dynamically allocated array of Animal objects. Then, you simply have for (int i = 0; i < size; i++) { array[i].feed(); } But that won t quite work yet& because of the slicing problem If you put a bunch of Animal objects in an array of Animals, they ll lose their identity. They have to! Why ? So& the solution is to have an array of pointers to Animal objects Animal* array[numberOfAnimals]; // initialize the array for (int i = 0; i < size; i++) { array[i]->feed(); } Late binding (the virtual function idea) allows for automatic polymorphic behaviorBeZ4ZZmZSZ? 4T%3a 4>j) /PsxHH@Rg(HH(dh   ` www3ff` 3fff` ___>?" dF@,?n<d@uA @ " d`  n?" dd@   @@``PR   @ ` `P0p>> - 2003 WL Truppel \CS 12: Intro. Computer Science II " Lecture 10 X( = 2  N`U0?"! :    NU0gֳgֳ ?"`  T Click to edit Master title style! !<  HV0gֳgֳ ?"  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  N@W0gֳgֳ ?"`p  Z*    NX0gֳgֳ ?"`    \*     NY0gֳgֳ ?"`@  \*   N  6n޽h? ? www3ff $Blank Presentation3  - 2003 WL Truppel \CS 12: Intro. 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