UrbanPro

Learn C Language from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Search in

How would you explain C++'s rule of 0, rule of 3, and rule of 5 in your own words?

Asked by Last Modified  

Follow 4
Answer

Please enter your answer

Electrical Engineer from IIT Kanpur ,By profession Software Engineer and Teacher by passion

These rules are instrumental when you design your class. When you create/write a new class, you always think of 5 place holder methods in it. Earlier it was three, but after C++ 11 it became 5. They are: Constructor Copy Constructor Assignment operator; After C++11 - Move Copy constructor Move Assignment...
read more

These rules are instrumental when you design your class.

When you create/write a new class, you always think of 5 place holder methods in it.

Earlier it was three, but after C++ 11 it became 5.

They are: 

  1. Constructor 
  2. Copy Constructor
  3. Assignment operator; After C++11 - 
  4. Move Copy constructor 
  5. Move Assignment operator.
  • Rule of 0 means, your class is designed in a way, such that you don't need any of 1,2,3,4,5
  • Rule of 3 means, you need 1,2,3
  • Rule 3 of 5 means, you need all 1,2,3,4,5

Best case is to design a class so that you have a rule of 0. But it's not always possible.

It will depend on the nature of your class members. It's bad practice to have them as raw pointers because then you have to write these constructors carefully and also think about resource leakage. Sometimes, we make them shared pointer or unique pointer etc. to reduce our work of writing these constructors and methods. If your class members are themselves following the rule of 0,3,5 etc., then it will also affect your decision whether you have to give all 5 or 0 or 3.

In a nutshell, it's always a good practice to think about these five methods, whenever you write a new class. 

Good question!!

read less
Comments

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

INTRODUCTION TO PROGRAMMING LANGUAGES
Language is a medium for communication. If we want to perform anything with another person, we can know the human language as a human being. Similarly, if we want to perform anything with a computer, we...

Facts about C language
C programming language was developed in 1972 by Dennis Ritchie at AT&T Bell Labs. It was developed to overcome the problems of languages such as B, BPCL. It was developed to write the Unix operating...

Manoj S. | 03/08/2020

0 0
0

Dynamic Memory Allocation in C using malloc()
#include <stdio.h>#include <conio.h>//#include <malloc.h> OR#include <stdlib.h>void main(){ int *ptr, i, n, sum = 0; printf("how many elements ? "); scanf("%d", &n);...

Sankhadeep Pujaru | 04/06/2020

0 0
0

Recommended Articles

Brilliant Academy is one of the reputed institutes for B.Tech tuition classes. This institute is specialised in delivering quality tuition classes for B.E, Engineering - all streams and Engineering diploma courses. Incorporated in 2012, Brillant Academy is a brainchild of Mr Jagadeesh. The main motto of the academy is to...

Read full article >

Lasya Infotech is a Hyderabad based IT training institute founded in 2016 by O Venkat. Believing in his innovation, passion and persistence and with a diverse blend of experience, he started his brainchild to deliver exemplary professional courses to aspiring candidates by honing their skills. Ever since the institute envisions...

Read full article >

Information technology consultancy or Information technology consulting is a specialized field in which one can set their focus on providing advisory services to business firms on finding ways to use innovations in information technology to further their business and meet the objectives of the business. Not only does...

Read full article >

Almost all of us, inside the pocket, bag or on the table have a mobile phone, out of which 90% of us have a smartphone. The technology is advancing rapidly. When it comes to mobile phones, people today want much more than just making phone calls and playing games on the go. People now want instant access to all their business...

Read full article >

Looking for C Language Classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for C Language Classes?

The best tutors for C Language Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Learn C Language with the Best Tutors

The best Tutors for C Language Classes are on UrbanPro

Book a Free Demo

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more