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

How do I learn C programming by videos or books?
BOOKS AND PRACTICE by far remain the best way for learning any language ....
Fgrefg
0 0
View Comments7
What is the best website to learn c language?
NIIT online
Nom
I know some basics of c, how much time will I require more to reach a good/advance level in c?
It is about 3 to 4 months according to me..
Akash
What are all the data types in C programming with their details?
C programming language supports several data types, which are categorized into two main groups: primitive or basic data types and derived data types. Primitive data types include: Integers: Represent...
Ganga
0 0
View Comments6
Why do C++ programmers dislike C?
C++ programmers don't dislike C universally; some may find C limiting due to its lack of modern features like object-oriented programming and stricter type safety
Jitender
0 0
View Comments6

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++ Program-Working with constant using #define preprocessor
//Header Files #include#include // using #define preprocessor for defining a constant#define len 10#define br 5#define rad 3#define NEWLINE '\n' //Main function void main(){ int area_r; float area_c; //Function...

Salim Ahmed Ansari

0 0
View Comments0
Pointers in C : Why Students Fear Them (and why they Shouldn't)

Vikas Bandaru

0 0
View Comments0
Design your own Mouse Driver in C Language
Mouse Driver (msdrv.h) #include #include union REGS i,o; restrictmouseptr(int x1, int y1, int x2, int y2) { i.x.ax=7; i.x.cx=x1; i.x.dx=x2; ...

P K Subudhi

1 0
View Comments0
Datatypes in C Language
Data types in C Language Data types specify how we enter data into our programs and what type of data we enter. C language has some predefined set of data types to handle various kinds of data that...

Venkateswararao S.

0 0
View Comments0
Bit wise operators in C
Bit Wise Operators Bit Wise operators are manipulates of individual bits with in a word of memory. The bit wise operators can be divided in to three general category. One’s Complement...

Venkateswararao S.

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 Chennai
C Language Classes in Mumbai
C Language Classes in Kolkata
C Language Classes in Noida
C Language Classes in Ghaziabad
C Language Classes in Gurgaon

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