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

Asked by Last Modified  

1 Answer

Learn C Language +3 C Language Programming Advanced C++ Basic C++

Follow 5
Answer

Please enter your answer

Ashish Kumar

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: Constructor Copy Constructor Assignment operator; After C++11 - Move Copy constructor 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
Dislike Bookmark

Related Questions

hi sir c progarm codeing how to write sir........
take any C book then u can learn more...
Suryateja
Is the C language required to learn Java?
No, learning the C language is not a strict requirement for learning Java. While C and Java share some syntactical similarities, they are distinct programming languages with different paradigms. Java was...
Akhilesh
0 0
View Comments7
What are pointers in C language?
a variable that stores the memory address of another variable
Sanjeevani
0 0
View Comments6
What are the control statements in C language?
They are broadly classified into three types: decision-making, iteration, and jump statements. Decision-making statements, like if, else if, and switch, determine the flow of execution based on conditions....
Mukund
0 0
View Comments5
How can you avoid including a header more than once?
Most common ways, use: #pragma once on top of the each header file (though non standard but most compilers support it) or do the following, if you want to protect abc.h from multiple inclusions then...
Deepak
0 0
View Comments7

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

Ask a Question

Related Lessons

C for Begginers
C is an procedure oriented programming language. For any begginer the word program is new. Program: Set of instructions to be followed by machine or computer. Instruction Examples: Arithmetic instruction...

Sonali K.

5 0
View Comments0
Be prepared to get trained--init
Before starting the training,students must be mentally prepared for acceptance of new knowledge. Students must attend training with open minded forgetting the position they are working.This will help...
S

Smartnub Softsolutions

0 0
View Comments0
PRACTISE makes you PERFECT ; ; ; There is no SUBSTITUTE for HARD WORK ;;;;Breathe SUCCESS like OXYGEN
Proper Planning ( reg what portions to be covered today) revising today's class portions & clarifying doubts solving Maths problems regularly ,noting down formulae separately trying to understand...

Kiruthika S.

1 0
View Comments0
Lets know about far, near and huge pointers for fresher interview purpose
All of these three candidates relate to 16 bit architecture where segmented memory architecture was there. They are not at all relevant for present days 32 or 64 bit architecture where the way of memory...

Shiladitya Munshi

0 0
View Comments0
Why C is a Language and not a database?
When I interviewed a candidate, I raised this question many times, but I have not got the answer correctly. To under why C is a language and not a database, it is good to understand why our communication...

Vihanga Embedsoft

0 0
View Comments0

Recommended Articles

Lasya Infotech: An educational Training...

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 >

Brilliant Academy, a reputed B. Tech Tuition...

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 >

8 Hottest IT Careers of 2014!

Whether it was the Internet Era of 90s or the Big Data Era of today, Information Technology (IT) has given birth to several lucrative career options for many. Though there will not be a “significant" increase in demand for IT professionals in 2014 as compared to 2013, a “steady” demand for IT professionals is rest assured...

Read full article >

Top 5 Skills Every Software Developer Must have

Software Development has been one of the most popular career trends since years. The reason behind this is the fact that software are being used almost everywhere today.  In all of our lives, from the morning’s alarm clock to the coffee maker, car, mobile phone, computer, ATM and in almost everything we use in our daily...

Read full article >

Find C Language Classes near you
C Language Classes in Bangalore
C Language Classes in Hyderabad
C Language Classes in Delhi
C Language Classes in Pune
C Language Classes in Mumbai
C Language Classes in Chennai
C Language Classes in Kolkata
C Language Classes in Ghaziabad
C Language Classes in Noida
C Language Classes in Jaipur

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