Dynamic Objects

The dynamic object can be created by the execution of a new operator expression. The syntax for creating a dynamic object is shown above. It returns the address of a newly created object. The returned address of an object can be stored in a variable of type pointer to object.

While creating a dynamic object, if a class has the default constructor, it is invoked as a part of object creation activity. Once a pointer is holding the address of a dynamic object, its members can be accessed by using -> operator. 

The syntax of delete operator releasing memory allocated to dynamic object is as

follows:

delete pointer_to_object

it destroys the object pointed to by pointer_to_object variable. It also invokes the destructor of the class if it exists as a part of object destruction activity before releasing memory allocated to an object by the new operator.

Sample Program

#include <iostream.h>

class de

{

public:

int data1;

char data2;

de(void)

{

cout<<”Constructor”<<endl;

data1 = 1;

data2 = ‘A’;

}

~de()

{

cout<<”Destructor”<<endl;

}

void show(void)

{

cout<<data1<<data2<<endl;

}

};

void main()

{

de *ptr_obj;

ptr_obj = new de;

cout<<”Accessing through dynamic object”<<endl;

ptr_obj->show();

cout<<”Destroying the dynamic object”<<endl;

delete ptr_obj;

}