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Chapter 15: Problem 10

The has-a relation between classes is best implemented using the mechanism of class _________.

Short Answer

Expert verified
Answer: Class composition.

Step by step solution

01

Understand the statement

In the given statement, we are looking for a mechanism that allows us to implement the has-a relationship between classes.
02

Review inheritance, composition, and aggregation

There are three common ways of establishing relationships between classes: 1. Inheritance: Represents an is-a relationship, where a subclass (derived class) inherits properties and methods from a superclass (base class). 2. Composition: Represents a strong has-a relationship, where the containing class is responsible for the existence and lifetime of the contained class. 3. Aggregation: Represents a weak has-a relationship, where the containing class is not responsible for the existence and lifetime of the contained class.
03

Choose the best mechanism for implementing the has-a relationship

Based on the definitions of inheritance, composition, and aggregation, we can conclude that both composition and aggregation represent a has-a relationship. However, the statement asks for the "best" method to implement the relationship. Since composition represents a strong has-a relationship and provides better encapsulation, it is considered the best mechanism for implementing the has-a relationship between classes.
04

Complete the statement

Based on our analysis, composition is the best method for implementing the has-a relationship. So the completed statement should be: "The has-a relation between classes is best implemented using the mechanism of class composition."

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Most popular questions from this chapter

Write a C++ class that has an array of integers as a member variable, a pure virtual member function bool compare(int \(x, \text { int } y)=0\) that compares its two parameters and returns a boolean value, and a member function void sort () that uses the comparison defined by the compare virtual function to sort the array. The sort function will swap a pair of array elements a \([\mathrm{k}]\) and a \([\text { j }]\) if \\[ \text { compare }(a[k], a[j]) \\] returns true. Explain how you can use this class to produce classes that sort arrays in ascending order and descending order.

Suppose that the classes Dog and cat derive from Animal, which in turn derives from Creature. Suppose further that pDog, pCat, pAnimal, and pCreature are pointers to the respective classes. Suppose that Animal and creature are both abstract classes. Will the statement pCreature \(=\) new Dog; compile?

Suppose that you need to have a class that can sort an array in ascending order or descending order upon request. If an array is already sorted in ascending or descending order, you can easily sort it the other way by reversing it. Now suppose you have two different classes that encapsulate arrays. One provides a member function to reverse its array, while the other provides a member function to sort its array. Can you use multiple inheritance to obtain a quick solution to your problem? Should you? Write a couple of paragraphs explaining whether using multiple inheritance will or will not work to solve this problem, and, if it can, whether this is a good way to solve the problem.

A base class pointer needs a(n) _________ to be assigned to a derived class pointer.

A collection of abstract classes defining an application in skeletal form is called a(n) _________.
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