C++ Crash Kurs. Polymorphism. Dr. Dennis Pfisterer Institut für Telematik, Universität zu Lübeck
|
|
- Beverly Norris
- 6 years ago
- Views:
Transcription
1 C++ Crash Kurs Polymorphism Dr. Dennis Pfisterer Institut für Telematik, Universität zu Lübeck
2 C++ Polymorphism Major abstractions of C++ Data abstraction (using classes) Class relationships (using inheritance) However, often upcasting does not offer the desired behavior Example class Car public: void start() cout << "Car::start()" << endl; } }; class BMW : public Car public: void start() cout << "BMW::start()" << endl; } }; int main(int argc, char** argv) Car *car = new BMW; car->start(); //Calls Car::start(), not BMW::start() delete car; } Example: intro.cpp 2
3 C++ Polymorphism Standard behavior The type of the pointer, not the type of the object determines the method to invoke Desired behavior The type of the object, not the type of the pointer should determine the method to invoke Concept called polymorphism Even if it looks the same (same pointer type), it may behave differently (different types of objects) Key concept for the understanding of object oriented programming 3
4 C++ Inheritance: Dynamic Binding Compiler decides at run-time which method is invoked Depending on the type pointed-at object Key-word virtual Example class Car virtual void start ()... } // Car::start }; class BMW : public Car virtual void start ()... } //Redefinition: BMW::start redefines Car::start }; Car *car; BMW *bmw; car = new Car; car->f(x); //Invokes Car::f bmw = new BMW; b->f(x); //Invokes BMW::f car = new BMW; //UPCAST!!! car->f(x); //Invokes BMW::f since the object s type is BMW Example: introvirtual.cpp 4
5 C++ Inheritance: Dynamic Binding Compiler adds type information to the classes data structures to determine the object s type at runtime Keyword virtual tells the compiler to not to perform static binding (only for virtual methods) Compilers implement this behind the scenes by adding vtables They list address offsets of virtual functions for this object Method invocations require additional level of indirection (performance) Derived Memory address Base Base TypeInfo Base* TypeInfo Derived* Base* 5
6 C++ Inheritance: Name hiding Recall Redefinition of non-virtual identifiers Virtual methods behave differently Not called redefinition, but overriding No different return types are allowed (to guarantee a common polymorphic interface) Exception Derived class may return Derived* instead of Base* 6
7 C++ Inheritance: Behavior in constructors Problem Derived classes have not been initialized while the in the constructor of the base class runs As a result, virtual functions can not be invoked as they might invoke non-initialized code Behavior In constructors, virtual methods of the current class are invoked Same applies to destructors 7
8 C++ Inheritance: Why is virtual an option? Why is virtual an option if it triggers the correct behavior? C++ philosophy: If you don t use, you don t pay for it Virtual function calls need slightly more performance Additional level of indirection through vtable Inhibits several other performance optimizations possible with static binding Don t be worried about efficiency in the first place When designing classes, use polymorphism (virtual) extensively Optimization is possible later if the class concept is designed well Example: exhaustiveexample.cpp 8
9 C++ Inheritance: Virtual destructors Objects are deleted from memory using pointers In conjunction with polymorphism, which destructor is called? Base* b = new Derived; b->do_something(); delete b; Same behavior as with non-virtual methods: Type of the pointer determines the function (here: destructor) invoked Classes using polymorphism (virtual) must implement virtual destructors class A public: virtual ~A() } virtual f() } } 9
10 C++ Inheritance: Designing interfaces Often, base classes only provide an interface and no functionality What is start() supposed to do for Vehicle or Car? Vehicle and Car provide the interface to the outside BMW and VW provide real functionality How to avoid implementing of such interface methods? Vehicle Car Lorry Bike BMW VW 10
11 C++ Inheritance: pure virtual methods C++ provides the concept of abstract classes Pure virtual methods have no implementation A class containing pure virtual methods can not be instantiated Abstract classes provide a common interface that sub-classes implement Syntax virtual method-signature = 0; Examples class A virtual void f() = 0; }; class B virtual void f(const int x&) const = 0; }; 11
12 C++ Inheritance: pure virtual methods Interface and implementation class Lamp public: virtual void on() = 0; virtual void off() = 0; }; Usage class LightBulb : public Lamp public: void on() } void off() } private: }; void switch_on(lamp& l) l.on(); } LightBulb lb; switch_on(lb); //Polymorphism LightBulb::on() Example: purevirtual.cpp 12
13 C++ Inheritance: Summary polymorphism Properties The type of the object pointed-at is important, not the type of the pointer Only for functions declared to be virtual Advantages Code (new behaviors) can be added without requiring changes to other classes Easy implementation of interfaces Disadvantages Dynamic binding introduces run-time overhead 13
14 C++ Inheritance: Object slicing Passing derived objects by reference or pointer is always safe f(base *b) } or f(base &b) } Derived d; f(&d); or f (d); OK, pointed-at object is still of type Derived Passing derived objects by value leads to object slicing f(base b) } Derived d; f(d); b is a copy of d of type Base (which may not be what you wanted) 14
15 C++ Inheritance: Down-Casting Sometimes its necessary to perform a safe down-cast Type* t = dynamic_cast<type*> variable; Returns NULL if the conversion was not possible Only applicable to pointers Introduces some runtime overhead Should not be used too often If used very often, there is a good chance of your design being flawed Example Vehicle *v = new BMW BMW* bmw = dynamic_cast<bmw*> v; VW* vw = dynamic_cast<vw*> v; if( bmw!= NULL ) } else if( vw!= NULL ) } 15
Polymorphism. Zimmer CSCI 330
Polymorphism Polymorphism - is the property of OOP that allows the run-time binding of a function's name to the code that implements the function. (Run-time binding to the starting address of the code.)
More informationPOLYMORPHISM 2 PART. Shared Interface. Discussions. Abstract Base Classes. Abstract Base Classes and Pure Virtual Methods EXAMPLE
Abstract Base Classes POLYMORPHISM 2 PART Abstract Classes Static and Dynamic Casting Common Programming Errors class B { // base class virtual void m( ) =0; // pure virtual function class D1 : public
More informationPOLYMORPHISM 2 PART Abstract Classes Static and Dynamic Casting Common Programming Errors
POLYMORPHISM 2 PART Abstract Classes Static and Dynamic Casting Common Programming Errors CSC 330 OO Software Design 1 Abstract Base Classes class B { // base class virtual void m( ) =0; // pure virtual
More informationWhat is Polymorphism? Quotes from Deitel & Deitel s. Why polymorphism? How? How? Polymorphism Part 1
Polymorphism Part 1 What is Polymorphism? Polymorphism refers to a programming language s ability to process objects differently depending on their data type or class. Number person real complex kid adult
More informationC++ Crash Kurs. Exceptions. Dr. Dennis Pfisterer Institut für Telematik, Universität zu Lübeck
C++ Crash Kurs Exceptions Dr. Dennis Pfisterer Institut für Telematik, Universität zu Lübeck http://www.itm.uni-luebeck.de/people/pfisterer C++ Exceptions: Introduction What are exceptions Exceptions are
More informationPolymorphism Part 1 1
Polymorphism Part 1 1 What is Polymorphism? Polymorphism refers to a programming language s ability to process objects differently depending on their data type or class. Number person real complex kid
More informationC++ Programming: Polymorphism
C++ Programming: Polymorphism 2018 년도 2 학기 Instructor: Young-guk Ha Dept. of Computer Science & Engineering Contents Run-time binding in C++ Abstract base classes Run-time type identification 2 Function
More informationC++ Important Questions with Answers
1. Name the operators that cannot be overloaded. sizeof,.,.*,.->, ::,? 2. What is inheritance? Inheritance is property such that a parent (or super) class passes the characteristics of itself to children
More informationPolymorphism. Miri Ben-Nissan (Kopel) Miri Kopel, Bar-Ilan University
Polymorphism Miri Ben-Nissan (Kopel) 1 Shape Triangle Rectangle Circle int main( ) Shape* p = GetShape( ); p->draw( ); Shape* GetShape( ) choose randomly which shape to send back For example: Shape* p
More informationVIRTUAL FUNCTIONS Chapter 10
1 VIRTUAL FUNCTIONS Chapter 10 OBJECTIVES Polymorphism in C++ Pointers to derived classes Important point on inheritance Introduction to virtual functions Virtual destructors More about virtual functions
More informationIntroduction to C++ Introduction to C++ Dr Alex Martin 2013 Slide 1
Introduction to C++ Introduction to C++ Dr Alex Martin 2013 Slide 1 Inheritance Consider a new type Square. Following how we declarations for the Rectangle and Circle classes we could declare it as follows:
More information(12-1) OOP: Polymorphism in C++ D & D Chapter 12. Instructor - Andrew S. O Fallon CptS 122 (April 3, 2019) Washington State University
(12-1) OOP: Polymorphism in C++ D & D Chapter 12 Instructor - Andrew S. O Fallon CptS 122 (April 3, 2019) Washington State University Key Concepts Polymorphism virtual functions Virtual function tables
More informationQUIZ. Write the following for the class Bar: Default constructor Constructor Copy-constructor Overloaded assignment oper. Is a destructor needed?
QUIZ Write the following for the class Bar: Default constructor Constructor Copy-constructor Overloaded assignment oper. Is a destructor needed? Or Foo(x), depending on how we want the initialization
More informationCS105 C++ Lecture 7. More on Classes, Inheritance
CS105 C++ Lecture 7 More on Classes, Inheritance " Operator Overloading Global vs Member Functions Difference: member functions already have this as an argument implicitly, global has to take another parameter.
More informationObject Oriented Programming. Solved MCQs - Part 2
Object Oriented Programming Solved MCQs - Part 2 Object Oriented Programming Solved MCQs - Part 2 It is possible to declare as a friend A member function A global function A class All of the above What
More informationWhat does it mean by information hiding? What are the advantages of it? {5 Marks}
SECTION ONE (COMPULSORY) Question #1 [30 Marks] a) Describe the main characteristics of object-oriented programming. {5 Marks Encapsulation the ability to define a new type and a set of operations on that
More informationC++ Inheritance and Encapsulation
C++ Inheritance and Encapsulation Private and Protected members Inheritance Type Public Inheritance Private Inheritance Protected Inheritance Special method inheritance 1 Private Members Private members
More informationObject-Oriented Programming, Iouliia Skliarova
Object-Oriented Programming, Iouliia Skliarova CBook a = CBook("C++", 2014); CBook b = CBook("Physics", 1960); a.display(); b.display(); void CBook::Display() cout
More informationObject-Oriented Programming, Iouliia Skliarova
Object-Oriented Programming, Iouliia Skliarova You reuse code by creating new classes, but instead of creating them from scratch, you use existing classes that someone else has built and debugged. In composition
More informationPOLYMORPHISM Polymorphism: the type Polymorphism taking many shapes type of object
1 License: http://creativecommons.org/licenses/by-nc-nd/3.0/ POLYMORPHISM There are three major concepts in object-oriented programming: 1. Encapsulation (Classes), Data abstraction, information hiding
More information04-24/26 Discussion Notes
04-24/26 Discussion Notes PIC 10B Spring 2018 1 When const references should be used and should not be used 1.1 Parameters to constructors We ve already seen code like the following 1 int add10 ( int x
More informationIntroduction to Programming Using Java (98-388)
Introduction to Programming Using Java (98-388) Understand Java fundamentals Describe the use of main in a Java application Signature of main, why it is static; how to consume an instance of your own class;
More informationInheritance. Program construction in C++ for Scientific Computing. School of Engineering Sciences. Introduction. Michael Hanke.
1 (32) Inheritance School of Engineering Sciences Program construction in C++ for Scientific Computing 2 (32) Outline 1 2 3 4 3 (32) In the previous lecture we have developed a method for grid generation
More informationCOMP322 - Introduction to C++
COMP322 - Introduction to C++ Winter 2011 Lecture 08 - Inheritance continued School of Computer Science McGill University March 8, 2011 Last Time Single Inheritance Polymorphism: Static Binding vs Dynamic
More informationIncreases Program Structure which results in greater reliability. Polymorphism
UNIT 4 C++ Inheritance What is Inheritance? Inheritance is the process by which new classes called derived classes are created from existing classes called base classes. The derived classes have all the
More informationInheritance and aggregation
Advanced Object Oriented Programming Inheritance and aggregation Seokhee Jeon Department of Computer Engineering Kyung Hee University jeon@khu.ac.kr 1 1 Inheritance? Extend a class to create a new class
More informationA <Basic> C++ Course
adapted from Jean-Paul Rigault courses 1 A C++ Course 8 Object-oriented programming 2 Julien Deantoni 2 Outline Dynamic Typing Truncature Cast 3 Variants of class Paragraph Definition of derived
More informationInheritance, and Polymorphism.
Inheritance and Polymorphism by Yukong Zhang Object-oriented programming languages are the most widely used modern programming languages. They model programming based on objects which are very close to
More informationData Structures and Other Objects Using C++
Inheritance Chapter 14 discuss Derived classes, Inheritance, and Polymorphism Inheritance Basics Inheritance Details Data Structures and Other Objects Using C++ Polymorphism Virtual Functions Inheritance
More informationCS32 - Week 4. Umut Oztok. Jul 15, Umut Oztok CS32 - Week 4
CS32 - Week 4 Umut Oztok Jul 15, 2016 Inheritance Process of deriving a new class using another class as a base. Base/Parent/Super Class Derived/Child/Sub Class Inheritance class Animal{ Animal(); ~Animal();
More informationObject Oriented Software Design II
Object Oriented Software Design II Inheritance Giuseppe Lipari http://retis.sssup.it/~lipari Scuola Superiore Sant Anna Pisa February 29, 2012 G. Lipari (Scuola Superiore Sant Anna) C++ Intro February
More informationExtending Classes (contd.) (Chapter 15) Questions:
Extending Classes (contd.) (Chapter 15) Questions: 1 Virtual Functions in C++ Employee /\ / \ ---- Manager 2 Case 1: class Employee { string firstname, lastname; //... Employee( string fnam, string lnam
More informationCS 162, Lecture 25: Exam II Review. 30 May 2018
CS 162, Lecture 25: Exam II Review 30 May 2018 True or False Pointers to a base class may be assigned the address of a derived class object. In C++ polymorphism is very difficult to achieve unless you
More informationIntro to OOP Visibility/protection levels and constructors Friend, convert constructor, destructor Operator overloading a<=b a.
Intro to OOP - Object and class - The sequence to define and use a class in a program - How/when to use scope resolution operator - How/when to the dot operator - Should be able to write the prototype
More informationObject Oriented Software Design II
Object Oriented Software Design II Inheritance Giuseppe Lipari http://retis.sssup.it/~lipari Scuola Superiore Sant Anna Pisa February 29, 2012 G. Lipari (Scuola Superiore Sant Anna) C++ Intro February
More informationCS11 Introduction to C++ Fall Lecture 7
CS11 Introduction to C++ Fall 2012-2013 Lecture 7 Computer Strategy Game n Want to write a turn-based strategy game for the computer n Need different kinds of units for the game Different capabilities,
More information15: Polymorphism & Virtual Functions
15: Polymorphism & Virtual Functions 김동원 2003.02.19 Overview virtual function & constructors Destructors and virtual destructors Operator overloading Downcasting Thinking in C++ Page 1 virtual functions
More informationOOP Fundamental Concepts
Polymorphism Dr. Sanem Sarıel Talay 1 OOP Fundamental Concepts 1. Encapsulation (Classes) Data abstraction, information hiding 2. Inheritance Is a relation, reusability 3. Polymorphism Run time decision
More informationChapter 5 Object-Oriented Programming
Chapter 5 Object-Oriented Programming Develop code that implements tight encapsulation, loose coupling, and high cohesion Develop code that demonstrates the use of polymorphism Develop code that declares
More informationCOMP322 - Introduction to C++ Lecture 09 - Inheritance continued
COMP322 - Introduction to C++ Lecture 09 - Inheritance continued Dan Pomerantz School of Computer Science 11 March 2012 Recall from last time Inheritance describes the creation of derived classes from
More informationNote 12/1/ Review of Inheritance Practice: Please write down 10 most important facts you know about inheritance...
CISC 2000 Computer Science II Fall, 2014 Note 12/1/2014 1 Review of Inheritance Practice: Please write down 10 most important facts you know about inheritance... (a) What s the purpose of inheritance?
More informationProject. C++: Inheritance III. Plan. Project. Before we begin. The final exam. Advanced Topics. Project. This week in the home stretch
Project C++: III Advanced Topics Othello submitted. Next submission: Team Evaluations Nov 10 th Please don t forget If solo give yourself a good evaluation! Indicate if okay to share feedback with partner
More informationObject-Oriented Programming (OOP) Fundamental Principles of OOP
Object-Oriented Programming (OOP) O b j e c t O r i e n t e d P r o g r a m m i n g 1 Object-oriented programming is the successor of procedural programming. The problem with procedural programming is
More informationG52CPP C++ Programming Lecture 13
G52CPP C++ Programming Lecture 13 Dr Jason Atkin http://www.cs.nott.ac.uk/~jaa/cpp/ g52cpp.html 1 Last lecture Function pointers Arrays of function pointers Virtual and non-virtual functions vtable and
More informationInheritance. OOP components. Another Example. Is a Vs Has a. Virtual Destructor rule. Virtual Functions 4/13/2017
OOP components For : COP 3330. Object oriented Programming (Using C++) http://www.compgeom.com/~piyush/teach/3330 Data Abstraction Information Hiding, ADTs Encapsulation Type Extensibility Operator Overloading
More informationOBJECT ORIENTED PROGRAMMING USING C++
OBJECT ORIENTED PROGRAMMING USING C++ Overview of C++ Overloading Overloading occurs when the same operator or function name is used with different signatures Both operators and functions can be overloaded
More informationProgramming C++ Lecture 5. Howest, Fall 2013 Instructor: Dr. Jennifer B. Sartor
Programming C++ Lecture 5 Howest, Fall 2013 Instructor: Dr. Jennifer B. Sartor Jennifer.sartor@elis.ugent.be S Templates S Function and class templates you specify with a single code segment an entire
More informationInheritance, Polymorphism and the Object Memory Model
Inheritance, Polymorphism and the Object Memory Model 1 how objects are stored in memory at runtime? compiler - operations such as access to a member of an object are compiled runtime - implementation
More informationOOPS Viva Questions. Object is termed as an instance of a class, and it has its own state, behavior and identity.
OOPS Viva Questions 1. What is OOPS? OOPS is abbreviated as Object Oriented Programming system in which programs are considered as a collection of objects. Each object is nothing but an instance of a class.
More informationCpt S 122 Data Structures. Course Review Midterm Exam # 2
Cpt S 122 Data Structures Course Review Midterm Exam # 2 Nirmalya Roy School of Electrical Engineering and Computer Science Washington State University Midterm Exam 2 When: Monday (11/05) 12:10 pm -1pm
More informationChapter 15. Polymorphism and Virtual Functions. Copyright 2010 Pearson Addison-Wesley. All rights reserved
Chapter 15 Polymorphism and Virtual Functions Copyright 2010 Pearson Addison-Wesley. All rights reserved Learning Objectives Virtual Function Basics Late binding Implementing virtual functions When to
More informationAbsolute C++ Walter Savitch
Absolute C++ sixth edition Walter Savitch Global edition This page intentionally left blank Absolute C++, Global Edition Cover Title Page Copyright Page Preface Acknowledgments Brief Contents Contents
More informationWhat are the characteristics of Object Oriented programming language?
What are the various elements of OOP? Following are the various elements of OOP:- Class:- A class is a collection of data and the various operations that can be performed on that data. Object- This is
More informationCOEN244: Polymorphism
COEN244: Polymorphism Aishy Amer Electrical & Computer Engineering Polymorphism means variable behavior / ability to appear in many forms Outline Casting between objects Using pointers to access objects
More informationCompaq Interview Questions And Answers
Part A: Q1. What are the difference between java and C++? Java adopts byte code whereas C++ does not C++ supports destructor whereas java does not support. Multiple inheritance possible in C++ but not
More informationOOP THROUGH C++(R16) int *x; float *f; char *c;
What is pointer and how to declare it? Write the features of pointers? A pointer is a memory variable that stores the address of another variable. Pointer can have any name that is legal for other variables,
More informationObject-Oriented Programming
iuliana@cs.ubbcluj.ro Babes-Bolyai University 2018 1 / 40 Overview 1 2 3 4 5 2 / 40 Primary OOP features ion: separating an object s specification from its implementation. Encapsulation: grouping related
More informationMidterm Exam 5 April 20, 2015
Midterm Exam 5 April 20, 2015 Name: Section 1: Multiple Choice Questions (24 pts total, 3 pts each) Q1: Which of the following is not a kind of inheritance in C++? a. public. b. private. c. static. d.
More informationCMSC 202 Section 010x Spring Justin Martineau, Tuesday 11:30am
CMSC 202 Section 010x Spring 2007 Computer Science II Final Exam Name: Username: Score Max Section: (check one) 0101 - Justin Martineau, Tuesday 11:30am 0102 - Sandeep Balijepalli, Thursday 11:30am 0103
More informationCritique this Code. Hint: It will crash badly! (Next slide please ) 2011 Fawzi Emad, Computer Science Department, UMCP
Critique this Code string const & findsmallest(vector const &v) string smallest = v[0]; for (unsigned int i = 0; i < v.size(); i++) if (v[i] < smallest) smallest = v[i]; return smallest; Hint:
More informationInheritance and Polymorphism
Division of Mathematics and Computer Science Maryville College Outline Inheritance 1 Inheritance 2 3 Outline Inheritance 1 Inheritance 2 3 The "is-a" Relationship The "is-a" Relationship Object classification
More informationFramework Fundamentals
Questions Framework Fundamentals 1. Which of the following are value types? (Choose all that apply.) A. Decimal B. String C. System.Drawing.Point D. Integer 2. Which is the correct declaration for a nullable
More informationC How to Program, 6/e by Pearson Education, Inc. All Rights Reserved.
C How to Program, 6/e 1992-2010 by Pearson Education, Inc. All Rights Reserved. 1 Standard Behavior: When the compiler is working out which member function to call, it selects according to the type of
More informationPart VIII. More classes. Philip Blakely (LSC) C++ Introduction 226 / 370
Part VIII More classes Philip Blakely (LSC) C++ Introduction 226 / 370 Inheritance Outline 29 Inheritance 30 Virtual functions 31 Polymorphism 32 Classes and static Philip Blakely (LSC) C++ Introduction
More informationC++ Inheritance II, Casting
C++ Inheritance II, Casting CSE 333 Spring 2018 Instructor: Justin Hsia Teaching Assistants: Danny Allen Dennis Shao Eddie Huang Kevin Bi Jack Xu Matthew Neldam Michael Poulain Renshu Gu Robby Marver Waylon
More informationWhy use inheritance? The most important slide of the lecture. Programming in C++ Reasons for Inheritance (revision) Inheritance in C++
Session 6 - Inheritance in C++ The most important slide of the lecture Dr Christos Kloukinas City, UoL http://staff.city.ac.uk/c.kloukinas/cpp (slides originally produced by Dr Ross Paterson) Why use inheritance?
More informationAdvanced C++ Topics. Alexander Warg, 2017
www.kernkonzept.com Advanced C++ Topics Alexander Warg, 2017 M I C R O K E R N E L M A D E I N G E R M A N Y Overview WHAT IS BEHIND C++ Language Magics Object Life Time Object Memory Layout INTRODUCTION
More informationPolymorphism. Arizona State University 1
Polymorphism CSE100 Principles of Programming with C++, Fall 2018 (based off Chapter 15 slides by Pearson) Ryan Dougherty Arizona State University http://www.public.asu.edu/~redoughe/ Arizona State University
More informationVirtual functions concepts
Virtual functions concepts l Virtual: exists in essence though not in fact l Idea is that a virtual function can be used before it is defined And it might be defined many, many ways! l Relates to OOP concept
More informationCommon Misunderstandings from Exam 1 Material
Common Misunderstandings from Exam 1 Material Kyle Dewey Stack and Heap Allocation with Pointers char c = c ; char* p1 = malloc(sizeof(char)); char** p2 = &p1; Where is c allocated? Where is p1 itself
More informationAnnouncements. CSCI 334: Principles of Programming Languages. Lecture 18: C/C++ Announcements. Announcements. Instructor: Dan Barowy
CSCI 334: Principles of Programming Languages Lecture 18: C/C++ Homework help session will be tomorrow from 7-9pm in Schow 030A instead of on Thursday. Instructor: Dan Barowy HW6 and HW7 solutions We only
More informationInheritance and Polymorphism
Division of Mathematics and Computer Science Maryville College Outline Inheritance 1 Inheritance 2 3 Outline Inheritance 1 Inheritance 2 3 The "is-a" Relationship Object classification is typically hierarchical.
More informationReusable and Extendable Code. Composition Example (1) Composition Example (2) CS183-Su'02-Lecture 8 17 June by Eric A. Durant, Ph.D.
Reusable and Extendable Code Tools so far classes ADTs using classes Building new classes Composition class objects as data members Inheritance Extending an existing class 1 Composition Example (1) class
More informationObject Oriented Design
Object Oriented Design Chapter 12 continue 12.6 Case Study: Payroll System Using Polymorphism This section reexamines the CommissionEmployee- BasePlusCommissionEmployee hierarchy that we explored throughout
More information엄현상 (Eom, Hyeonsang) School of Computer Science and Engineering Seoul National University COPYRIGHTS 2017 EOM, HYEONSANG ALL RIGHTS RESERVED
엄현상 (Eom, Hyeonsang) School of Computer Science and Engineering Seoul National University COPYRIGHTS 2017 EOM, HYEONSANG ALL RIGHTS RESERVED - Polymorphism - Virtual Functions - Abstract Classes - Virtual
More informationCPSC 427: Object-Oriented Programming
CPSC 427: Object-Oriented Programming Michael J. Fischer Lecture 7 September 21, 2016 CPSC 427, Lecture 7 1/21 Brackets Example (continued) Storage Management CPSC 427, Lecture 7 2/21 Brackets Example
More informationCS 251 INTERMEDIATE SOFTWARE DESIGN SPRING C ++ Basics Review part 2 Auto pointer, templates, STL algorithms
CS 251 INTERMEDIATE SOFTWARE DESIGN SPRING 2011 C ++ Basics Review part 2 Auto pointer, templates, STL algorithms AUTO POINTER (AUTO_PTR) //Example showing a bad situation with naked pointers void MyFunction()
More informationCS250 Intro to CS II. Spring CS250 - Intro to CS II 1
CS250 Intro to CS II Spring 2017 CS250 - Intro to CS II 1 Topics Virtual Functions Pure Virtual Functions Abstract Classes Concrete Classes Binding Time, Static Binding, Dynamic Binding Overriding vs Redefining
More information1/29/2011 AUTO POINTER (AUTO_PTR) INTERMEDIATE SOFTWARE DESIGN SPRING delete ptr might not happen memory leak!
//Example showing a bad situation with naked pointers CS 251 INTERMEDIATE SOFTWARE DESIGN SPRING 2011 C ++ Basics Review part 2 Auto pointer, templates, STL algorithms void MyFunction() MyClass* ptr( new
More informationWeek 7. Statically-typed OO languages: C++ Closer look at subtyping
C++ & Subtyping Week 7 Statically-typed OO languages: C++ Closer look at subtyping Why talk about C++? C++ is an OO extension of C Efficiency and flexibility from C OO program organization from Simula
More informationCPSC 427: Object-Oriented Programming
CPSC 427: Object-Oriented Programming Michael J. Fischer Lecture 21 November 14, 2018 CPSC 427, Lecture 21, November 14, 2018 1/23 Singleton Design Pattern (revisited) More on Functions Casts and Conversions
More informationPassing arguments to functions by. const member functions const arguments to a function. Function overloading and overriding Templates
Lecture-4 Inheritance review. Polymorphism Virtual functions Abstract classes Passing arguments to functions by Value, pointers, refrence const member functions const arguments to a function Function overloading
More informationXII- COMPUTER SCIENCE VOL-II MODEL TEST I
MODEL TEST I 1. What is the significance of an object? 2. What are Keyword in c++? List a few Keyword in c++?. 3. What is a Pointer? (or) What is a Pointer Variable? 4. What is an assignment operator?
More informationInstantiation of Template class
Class Templates Templates are like advanced macros. They are useful for building new classes that depend on already existing user defined classes or built-in types. Example: stack of int or stack of double
More informationCPSC 427: Object-Oriented Programming
CPSC 427: Object-Oriented Programming Michael J. Fischer Lecture 18 November 7, 2016 CPSC 427, Lecture 18 1/19 Demo: Craps Game Polymorphic Derivation (continued) Name Visibility CPSC 427, Lecture 18 2/19
More informationContents. I. Classes, Superclasses, and Subclasses. Topic 04 - Inheritance
Contents Topic 04 - Inheritance I. Classes, Superclasses, and Subclasses - Inheritance Hierarchies Controlling Access to Members (public, no modifier, private, protected) Calling constructors of superclass
More informationChapter 14 Abstract Classes and Interfaces
Chapter 14 Abstract Classes and Interfaces 1 What is abstract class? Abstract class is just like other class, but it marks with abstract keyword. In abstract class, methods that we want to be overridden
More informationShort Notes of CS201
#includes: Short Notes of CS201 The #include directive instructs the preprocessor to read and include a file into a source code file. The file name is typically enclosed with < and > if the file is a system
More informationObject Oriented Programming: Inheritance Polymorphism
Object Oriented Programming: Inheritance Polymorphism Shahram Rahatlou Computing Methods in Physics http://www.roma1.infn.it/people/rahatlou/cmp/ Anno Accademico 2018/19 Today s Lecture Introduction to
More informationCS201 - Introduction to Programming Glossary By
CS201 - Introduction to Programming Glossary By #include : The #include directive instructs the preprocessor to read and include a file into a source code file. The file name is typically enclosed with
More informationOBJECT ORIENTED PROGRAMMING USING C++ CSCI Object Oriented Analysis and Design By Manali Torpe
OBJECT ORIENTED PROGRAMMING USING C++ CSCI 5448- Object Oriented Analysis and Design By Manali Torpe Fundamentals of OOP Class Object Encapsulation Abstraction Inheritance Polymorphism Reusability C++
More informationInheritance. Overview. Chapter 15 & additional topics. Inheritance Introduction. Three different kinds of inheritance
Inheritance Chapter 15 & additional topics Overview Inheritance Introduction Three different kinds of inheritance Changing an inherited member function More Inheritance Details Polymorphism Motivating
More informationI BCS-031 BACHELOR OF COMPUTER APPLICATIONS (BCA) (Revised) Term-End Examination. June, 2015 BCS-031 : PROGRAMMING IN C ++
No. of Printed Pages : 3 I BCS-031 BACHELOR OF COMPUTER APPLICATIONS (BCA) (Revised) Term-End Examination 05723. June, 2015 BCS-031 : PROGRAMMING IN C ++ Time : 3 hours Maximum Marks : 100 (Weightage 75%)
More informationInheritance and Polymorphism
Object Oriented Programming Designed and Presented by Dr. Ayman Elshenawy Elsefy Dept. of Systems & Computer Eng.. Al-Azhar University Website: eaymanelshenawy.wordpress.com Email : eaymanelshenawy@azhar.edu.eg
More informationAbstract Classes. Abstract Classes a and Interfaces. Class Shape Hierarchy. Problem AND Requirements. Abstract Classes.
a and Interfaces Class Shape Hierarchy Consider the following class hierarchy Shape Circle Square Problem AND Requirements Suppose that in order to exploit polymorphism, we specify that 2-D objects must
More informationJava: introduction to object-oriented features
Chair of Software Engineering Carlo A. Furia, Marco Piccioni, Bertrand Meyer Java: introduction to object-oriented features Chair of Software Engineering Carlo A. Furia, Marco Piccioni, Bertrand Meyer
More informationResource Management With a Unique Pointer. Resource Management. Implementing a Unique Pointer Class. Copying and Moving Unique Pointers
Resource Management Resource Management With a Unique Pointer Dynamic memory is an example of a resource that is allocated and must be released. void f() { Point* p = new Point(10, 20); // use p delete
More informationC:\Temp\Templates. Download This PDF From The Web Site
11 2 2 2 3 3 3 C:\Temp\Templates Download This PDF From The Web Site 4 5 Use This Main Program Copy-Paste Code From The Next Slide? Compile Program 6 Copy/Paste Main # include "Utilities.hpp" # include
More informationInheritance -- Introduction
Inheritance -- Introduction Another fundamental object-oriented technique is called inheritance, which, when used correctly, supports reuse and enhances software designs Chapter 8 focuses on: the concept
More informationstep is to see how C++ implements type polymorphism, and this Exploration starts you on that journey.
EXPLORATION 36 Virtual Functions Deriving classes is fun, but there s not a lot you can do with them at least, not yet. The next step is to see how C++ implements type polymorphism, and this Exploration
More information