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Chapter 8:Dynamic BindingAndAbstract classes презентация
Содержание
- 1. Chapter 8:Dynamic BindingAndAbstract classes
- 2. Objectives What is static binding? What is
- 3. 7.1- Static binding 5 Circle Constructor class
- 4. 7.2- Dynamic binding pc Circle Constructor class
- 5. 7.3- Restriction of overriding Functions Perhaps, you
- 6. 7.4- Virtual Functions- Polymorphism Polymorphism ability occurs
- 7. 7.5- Virtual Function Table
- 8. 7.6- Type Conformity Pointer of base
- 9. Type conformity…. Error: Can not convert “Point2*” to “Poỉnt3*” Opposite Type casting NO OK
- 10. Type conformity…. Explicit Type casting OK
- 11. Type conformity… Two classes have no relation. Explicit type casting ➔ OK
- 12. 7.7- Abstract class Result of so-high generation
- 13. Abstract class… Abstract class must have at
- 14. Abstract class….
- 15. Abstract subclass Error: Cannot create instance of
- 16. Abstract subclass…
- 17. 7.8-A Demonstration The following program depicts using
- 18. Class Shape and Circle
- 19. Class Rectangle
- 20. Class ShapeList
- 21. Class ShapeList…, main(), Result
- 22. 7.9- Class Object elements and Class Vector for arbitrary elements
- 23. 7.9- …
- 24. 7.9- Class Student:public Object
- 25. 7.9- Class Circle:public Object
- 26. 7.9- Main
- 27. Summary Virtual Method is a way to
- 28. Summary Abstract class is a result of
- 29. Exercises Using the class Object, implement classes:
- 30. Thanks
Objectives What is static binding? What is Dynamic binding? Restriction of overriding methods Virtual method Virtual function table Type conformity Abstract classes A demonstration
Слайд 2Objectives
What is static binding?
What is Dynamic binding?
Restriction of overriding methods
Virtual method
Virtual
function table
Type conformity
Abstract classes
A demonstration
Type conformity
Abstract classes
A demonstration
Слайд 37.1- Static binding
5
Circle
Constructor
class Circle
{ int x,y,r;
public:
Circle
(int xx, int yy, int rr)
{ x=xx; y=yy; r=rr;
}
void print()
{ cout < }
};
void main()
{ Circle c(3,4,5);
c.print();
}
{ x=xx; y=yy; r=rr;
}
void print()
{ cout <
};
void main()
{ Circle c(3,4,5);
c.print();
}
4
3
Circle
print()
main()
[180,65520]
[120,65520]
800
120
180
65520 c
Data is associated with corresponding code at compile-time
Слайд 47.2- Dynamic binding
pc
Circle
Constructor
class Circle
{ int x,y,r;
public:
Circle
(int xx, int yy, int rr)
{ x=xx; y=yy; r=rr;
}
void print()
{ cout < }
};
void main()
{ Circle *pc;
pc= new Circle(3,4,5);
pc->print();
}
{ x=xx; y=yy; r=rr;
}
void print()
{ cout <
};
void main()
{ Circle *pc;
pc= new Circle(3,4,5);
pc->print();
}
Circle
print()
main()
[180,[65540]]
[120,[65540]]
800
120
180
65540
Data is associated with corresponding code at run-time
5
Circle
Constructor
4
3
Circle
print()
main()
[180,1200]
[120,1200]
1200
1200
Слайд 67.4- Virtual Functions- Polymorphism
Polymorphism ability occurs
only when you use a
pointer
to an object and
used-methods of classes
are virtual methods
to an object and
used-methods of classes
are virtual methods
virtual ReturnType
or
ReturnType virtual
are accepted
Слайд 127.7- Abstract class
Result of so-high generation
class Circle
int x,y,r;
void print()
double area()
double perimeter()
class
Rectangle
int x1,y1,x2,y2;
void print()
double area()
double perimeter()
int x1,y1,x2,y2;
void print()
double area()
double perimeter()
class Triangle
int x1,y1,x2,y2,x3,y3;
void print()
double area()
double perimeter()
class Shape
void print()
double area()
double perimeter()
How will we implement
these methods?
Pure virtual
methods
Слайд 13Abstract class…
Abstract class must have at least one pure virtual method
Pure
virtual method is a method with no body.
Syntax of pure virtual method:
virtual DataType Method (…) = 0;
You cannot create an object of abstract class but you can declare a pointer of abstract class.
This pointer must be point to an object of a concrete class.
Syntax of pure virtual method:
virtual DataType Method (…) = 0;
You cannot create an object of abstract class but you can declare a pointer of abstract class.
This pointer must be point to an object of a concrete class.
Слайд 15Abstract subclass
Error: Cannot create instance
of abstract class ‘B’
A is
an abstract class
B is public subclass of A
In B, the inherited method
MA() is not overriden yet
➔ B is abstract class
B is public subclass of A
In B, the inherited method
MA() is not overriden yet
➔ B is abstract class
Слайд 177.8-A Demonstration
The following program depicts using abstract class.
People generate all concrete
classes as Circle, Rectangle,… into Shape class.
User will input some shape details
Program will print out details of all shape
Values of area and perimeter of each shape will be printed also.
User will input some shape details
Program will print out details of all shape
Values of area and perimeter of each shape will be printed also.
Слайд 27Summary
Virtual Method is a way to make polymorphism.
Syntax for virtual method:
virtual ReturnType Method (parameters)
ReturnType virtual Method (parameters)
Compiler will determine the right method will be called using a virtual function table for every class which contains virtual methods.
Pure virtual method is a virtual method but it has no code.
Syntax for pure virtual method:
virtual ReturnType Method (parameters)=0;
ReturnType virtual Method (parameters)
Compiler will determine the right method will be called using a virtual function table for every class which contains virtual methods.
Pure virtual method is a virtual method but it has no code.
Syntax for pure virtual method:
virtual ReturnType Method (parameters)=0;
Слайд 28Summary
Abstract class is a result of so-high generation.
Abstract class must have
at least one pure virtual method.
You can not create an object of abstract class but you can declare a pointer to it then, it points to an object of a concrete subclass.
You can not create an object of abstract class but you can declare a pointer to it then, it points to an object of a concrete subclass.
Слайд 29Exercises
Using the class Object, implement classes: Father, Mother, Son, Daughter.
Write
a program will
Input a list of members in a family. Store them into a Vector object.
Print out members of the family.
Input a list of members in a family. Store them into a Vector object.
Print out members of the family.
