Resource Management-Object Oriented Programming-Lecture Slides, Slides of Object Oriented Programming

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ObjectObject--Oriented Programming (OOP)Oriented Programming (OOP)

Lecture No. 45

Lecture No. 45

Example

Example

int function1(){

int function1(){

FILE *fileptr =

FILE *fileptr =

fopen( fopen(““filename.txtfilename.txt””,,““ww””););

throw exception();

throw exception();

fclose(fileptr); fclose(fileptr);

return 0; return 0;

Second Attempt

Second Attempt

class FilePtr{

class FilePtr{

FILE * f;

FILE * f;

public: public:

FilePtr(const char *name, FilePtr(const char *name,

const char * mode) const char * mode)

{ f = fopen(name, mode);}

{ f = fopen(name, mode);}

~FilePtr()

~FilePtr() { fclose(f);

{ fclose(f); }

operator FILE * ()

operator FILE * () { return f;

{ return f; }

Resource Management

Resource Management

►

►

The destructor of the FilePtr class will close

The destructor of the FilePtr class will close

the file

the file

►

►

Programmer does not have to close the file

Programmer does not have to close the file

explicitly in case of error as well as in

explicitly in case of error as well as in

normal case normal case

Example

Example

Student::Student (String aName) : Student::Student (String aName) :

name(aName) name(aName)

/*The constructor of String can throw a

/*The constructor of String can throw a

exception*/

exception*/

Example

Example

Student::Student (String aName)

Student::Student (String aName)

try

try

: name(aName) {

: name(aName) {

catch(

catch(

Example

Example

Complex::~Complex()

Complex::~Complex()

try{ try{

throw Exception(); throw Exception();

catch(

catch( …

Syntax

Syntax

void Function1() { void Function1() {……}}

void Function2() throw () { void Function2() throw () {……}}

void Function3( )

void Function3( )

throw (Exception1,

throw (Exception1, …

… ){}

){}

► ► Function1 can throw any exceptionFunction1 can throw any exception

► ► Function2 cannot throw any ExceptionFunction2 cannot throw any Exception

► ► Function3 can throw any exception of type Exception1 orFunction3 can throw any exception of type Exception1 or

any class derived from it

any class derived from it

Object Orientation

Object Orientation

►

►

What is an object

What is an object

►

►

Object

Object

Oriented Model

Oriented Model

Information HidingInformation Hiding

EncapsulationEncapsulation

Abstraction

Abstraction

► ► ClassesClasses

Object Orientation

Object Orientation

►

►

Multiple inheritance

Multiple inheritance

► ►

Types of association

Types of association

Simple associationSimple association

CompositionComposition

Aggregation

Aggregation

► ► PolymorphismPolymorphism

Inheritance

Inheritance

C++ Constructs

C++ Constructs

►

►

Public inheritance

Public inheritance

►

►

Private inheritance

Private inheritance

► ►

Protected inheritance

Protected inheritance

►

►

Overriding

Overriding

► ►

Class hierarchy

Class hierarchy

Templates

Templates

C++ Constructs

C++ Constructs

►

►

Generic programming

Generic programming

►

►

Classes template

Classes template

►►

Function templates

Function templates

►

►

Generic algorithm

Generic algorithm

►

►

Templates specialization

Templates specialization

Partial SpecializationPartial Specialization

Complete specializationComplete specialization