This document discusses aggregation in C++. Aggregation allows objects to be composed of other objects, creating a whole-part relationship. To declare an aggregated object in C++, a class declares a member variable of another class's type using a pointer or reference. The aggregated object can then be initialized in the constructor and accessed using pointer or reference syntax. Proper use of aggregation provides flexibility in managing object lifetimes and supports encapsulation and reusable object composition.

1. AGGREGATION IN C++:
POWER OF DATA
COMPOSITION

2. INTRODUCTION :
01
02
TOPIC: AGGREGATION IN C++: POWER OF DATA COMPOSITION
PRESENTER'S NAME : OMKAR KSHIRSAGAR

3. DEFINITION OF AGGREGATION
AGGREGATION IS A FUNDAMENTAL CONCEPT IN
OBJECT-ORIENTED PROGRAMMING (OOP) THAT
ALLOWS OBJECTS TO BE COMPOSED OF OTHER
OBJECTS, CREATING A WHOLE-PART RELATIONSHIP.
Key elements: Composition, whole-part relationship

4. DECLARING AN AGGREGATED OBJECT
Aggregating objects in C++ involves declaring an
aggregated object within a class. This allows us to compose
complex objects by combining simpler objects together.
1.SYNTAX
2.INITIALIZATION:
3.ACCESSING AGGREGATED OBJECT

5. SYNTAX :
DECLARE A MEMBER VARIABLE OF A CLASS AS A POINTER
OR REFERENCE TO THE AGGREGATED OBJECT TYPE.
USE THE APPROPRIATE DATA TYPE AND NAMING
CONVENTION.
class AggregatingClass {
//...
AggregatedType* aggregatedObject; // Aggregated object as a pointer
// or
AggregatedType& aggregatedObject; // Aggregated object as a reference
//...
};

6. INITIALIZATION
AGGREGATED OBJECTS CAN BE INITIALIZED IN THE
CONSTRUCTOR OF THE AGGREGATING CLASS.
USE DYNAMIC MEMORY ALLOCATION (IF USING POINTERS)
OR REFERENCE ASSIGNMENT (IF USING REFERENCES).
class AggregatingClass {
public:
AggregatingClass() {
aggregatedObject = new AggregatedType(); // Initialize aggregated object using dynamic memory allocation
// or
aggregatedObject = existingAggregatedObject; // Initialize aggregated object using reference assignment
}
//...
private:
AggregatedType* aggregatedObject; // Aggregated object as a pointer
// or
AggregatedType& aggregatedObject; // Aggregated object as a reference
//...
};

7. ACCESSING AGGREGATED OBJECT
TO ACCESS MEMBERS OR INVOKE FUNCTIONS OF THE
AGGREGATED OBJECT, USE THE POINTER OR REFERENCE
SYNTAX WITH THE ARROW (->) OR DOT (.) OPERATOR,
RESPECTIVELY.
CPP
ADING
class AggregatingClass {
public:
void doSomething() {
aggregatedObject->memberFunction(); // Access a member function of the aggregated object using a pointer
// or
aggregatedObject.memberFunction(); // Access a member function of the aggregated object using a reference
}
private:
AggregatedType* aggregatedObject; // Aggregated object as a pointer
// or
AggregatedType& aggregatedObject; // Aggregated object as a reference
};

8. Objects Aggregation in C++ allows for the
creation and destruction of aggregated
objects independently of the aggregating
object. This provides flexibility and control
over the lifespan of individual components.
LIFETIME MANAGEMENT OF AGGREGATED OBJECTS

9. EXAMPLE SCENARIO: AGGREGATING A
LIBRARY SYSTEM
DEMONSTRATION: SHOWCASE A SIMPLIFIED CODE
SNIPPET ILLUSTRATING AGGREGATION IN A LIBRARY
SYSTEM.
HIGHLIGHT THE COMPOSITION OF OBJECTS SUCH AS
LIBRARY, BOOK, AND PATRON USING AGGREGATION.
EMPHASIZE THE FLEXIBILITY AND REUSABILITY ACHIEVED
THROUGH AGGREGATION.

10. BEST PRACTICES FOR AGGREGATION IN
C++
PROPER MEMORY MANAGEMENT: ENSURE CORRECT
INITIALIZATION AND DESTRUCTION OF AGGREGATED
OBJECTS TO AVOID MEMORY LEAKS.
CONSISTENT OWNERSHIP: CLEARLY DEFINE OWNERSHIP AND
RESPONSIBILITY OF AGGREGATED OBJECTS TO MAINTAIN A
COHERENT DESIGN.
ENCAPSULATION: ENCAPSULATE AGGREGATED OBJECTS AND
PROVIDE APPROPRIATE INTERFACES FOR INTERACTION.

11. THANK YOU