This is esoteric because normally you would write a compare function and pass it to std::sort() but because this is a std::set and gets sorted at insertion, we need to specify the compare operator as part of the class and even explicitly during instantiation of the object. This is good to know thanks
Hi Rupesh, Detailed explanation. Your teaching style so understandable. Thank you. I have one doubt which not related to this "set" topic. A general one. At the starting of the program, "using namespace std;" is used. So do we need to mention std here - > "std::greater / std::less " ? I apologize for this my doubt is not relevant to this topic discussed.
Hi CppNuts, if you can do it, can you make some videos or maybe an entire playlist about boost libraries? Maybe a video about how to install them on Windows and Linux and some other videos about how to use the boost libraries. Thanks for the Stl playlist, I am learning a lot of new things
Thank you very much for this explanation. The operation overloading part wasn't so clear but you explained the concept of Set very well. You earned a subscriber and deserve many more. Keep uploading great content, Rupesh!
Hi Rupesh, why set is not sorted Person object on the basis of name(2nd argument),why on the basis of age(first argument)? Is it possible to sort the set on the basis of 2nd argument?
hey man, is there any container that provides uu-order feature such that order should not change at all ,if i am taking 7,3,1,4,2,9,10.....it should print exactly same 7,3,1,4,2,9,10?
There's a risk to this code, if you enter two Persons with the same age, the second person will not be entered into the set because it will be considered a duplicate because of the age variable. So, how can we write the code to recognize that the constructor variables are different?
Hi @ryklin1 I come across your answer. Simply add an or condition in the operator function like this: bool operator < ( const Person & rhs ) const { return ( age < rhs.age || name < rhs.name); } it should work.
i dont know where you can read it, but here is my explanation.... greater is a tamplate class it self, now it has all operator overloaded into it, but they have used ascending logic, now if you want to use descending logic then you write your own greater function, and as data type of greater is Person it will take our provided logic instead of its own logic. and in this line bool operator < (const Person& rhs) const {return age y) swap; here that if condition will be replaced by ( age < rhs.age) remeber we needed to do that because we are giving user defined data type otherwise you would not have to give this bool operator < (const Person& rhs) const {return age
@@eduardo9163 well when i was in college they gave me some book and that time i didn't know english so it was like understanding english first and then programming. And when i understood english i never red any programming book. It just internet and stuff. But i what i more emphasis is if you are beginner then just do some pattern printing and some other small programs. That should clear the doubts how to use your programming language and do what you want.
In 10:45 you did operator overloading.. can you explain why you have used 'const' in that line.. or what's the role of 'const' there.. you have used it twice in that line..
Correct me if i am wrong. If we have raw pointers as data members in our class, then we have to overload "operator==" because if we don't, the compiler will compare the pointer and not what it is pointing to and hence store it in the set, right?
Yes, you have to, because as it is not integral data types it's a user defined data type, which requires a way from user to be given that how to compare it. (And Set would need to know how to compare two elements in-order to place them according)
Hey, how can I implement set class using templates, I want to write the methods, that I have done, not getting the idea about how to implement iterator for this
it's not mandatory, just a good practice. const makes the object immutable at compile time since we're just comparing the objects and wont change the values we use const rhs is the object which will be on the right hand side. u can call it anything. but people usually use this notation for operator overloading. &rhs is the reference(address) of rhs. read Pass by Reference. ur not passing the actual variable but and address to the variable. This along with the const wont have significant effects on small programs but good practice is definitely makes a difference in large programs.
If the data members in a user defined data type are private, do we pass the information the same way? class Person { private: float age; string name; public: };
Still like this when the data members are private? set Set = { {30, “Rupesh”}, {25, “Hitesh”}}; Also, what if we have many float data members, that means it will take our input based on the order we declare the float data members in class?
hi bro thanks for the video.I have one doubt you are using set variable called Set. How 3 data of age and name are stored inside the same set without creating 3 different object name? my understanding is are you overwriting the age and name variable with different data?
bool operator < (const Person& rhs) const {return age< rhs.age;} can you please explain why "const {...}" -> const is used? what is the need to use that?
What is the use of lines 25,26 in the code , and you haven't made any explanation regarding those two lines(not the const part , it is the bool part)! I haven't understood what is being done there....!!! respond ASAP!!!!
I don't know why I am getting this error even after writing the same code as you have written!! The error message is actually huge. Here is a small part of it: D:/CodeBlocks/MinGW/lib/gcc/mingw32/5.1.0/include/c++/bits/stl_function.h:387:20: note: 'const Person' is not derived from 'const std::tuple' { return __x < __y; }
std::set needs some way to compare one object with another object because it has to create a tree inside and place these objects accordingly, so if you compare obj1
while compiling, i get this error - non-aggregate type 'set' cannot be initialized with an initializer list set Set = {1,2,5,4,3,1,2,3,4,5}; ^ ~~~~~~~~~~~~~~~~~~~~~
In the line "for {const auto& e: Set}" while "Set" contains integer value then also "&" is used with "auto". I checked that the similar code will also work if "&" is removed. Then why will we give "&"? If "Set" contains string variable then also both with and without "&" the iteration will work. Can you please explain why there is an "&" needed, or if it "&" is not mandatory then what is the benefit of using it?
step 1: write down code in vs code, step 2: take a screenshot of that. step 3: import the screenshot in "openboard" s/w( or any digital board you like ) and explain whatever you want to explain. To Know More Check Out: th-cam.com/video/3xlPxKzQiWU/w-d-xo.html
Instead of paid courses, you are getting knowledge about few products in the market if you watch ads and thats all it takes to get it free. I would say it is a good deal. :P
This is esoteric because normally you would write a compare function and pass it to std::sort() but because this is a std::set and gets sorted at insertion, we need to specify the compare operator as part of the class and even explicitly during instantiation of the object. This is good to know thanks
Hey Rupesh just because no one told you, Jhon is written wrong. John is the correct way to write the name. :)
@SuperLordee Heyy....Ik it’s usually john but jhon is also a name:)
superbb explanation ...! set< int , greater > for descending order
Yes, correct
Hi Rupesh,
Detailed explanation. Your teaching style so understandable. Thank you.
I have one doubt which not related to this "set" topic.
A general one.
At the starting of the program, "using namespace std;" is used. So do we need to mention std here - > "std::greater / std::less " ?
I apologize for this my doubt is not relevant to this topic discussed.
It is good question.
No you don't have to specify explicitly.
Hi CppNuts, if you can do it, can you make some videos or maybe an entire playlist about boost libraries?
Maybe a video about how to install them on Windows and Linux and some other videos about how to use the boost libraries.
Thanks for the Stl playlist, I am learning a lot of new things
Great explanation. Thanks to you
Thanks cppnuts.. we are eager to learn Stl from your video teachings..
Thanks for all your support.. 😊
Bro your sound is amazing funny and attractive, keep going !
Thanks 👍
so clear and enjoyable ! :-) thanks a million
Thanks man!!
Damnn I love those videos, they are really in depth and so damn clear!! Thanks a lot for your time man!
Thanks for the comment!!
Sir plzz explain the bool comparator part!!!!!
yeah plz
Rupesh, thank you so much for this lesson. I've appreciated a lot it!
wow clear my all concept thnxxxx sir
Glad to hear that
thank you so much sir ,it is very useful at the time of examinations..
could you explain me the for loop syntax that you have used in this video.
It is call range based for loop.
th-cam.com/video/dvaqLnbdEcM/w-d-xo.html
Here is my video on this topic, and i have compared it with normal loop.
😊
What if I want insert the new "Person" with the same age, which is already existed in the list, Ex: 30, "Raj", will this set allow?
No, same age is not allowed.
Once you have 30, Rupesh then you can't have 30 Hitesh.
@@CppNuts does not a different string make that an another unique object tho?
Thank you very much for this explanation. The operation overloading part wasn't so clear but you explained the concept of Set very well. You earned a subscriber and deserve many more. Keep uploading great content, Rupesh!
Thank you so much for creating this video! It was very clear, easy and enjoyable! Good luck and you've won me as a subscriber :)
Glad it was helpful!
Sir excellent content.
Thanks a ton
Very good informational tutorial.
Glad it was helpful!
Thank you man! Easy to understand!
Glad it helped!
Bro you are the best 😊
You are the best
More info and a clear explanation. You're the best in doing this.
Glad you think so!
Lovely expln... 👌🏻
Thanks a lot 😊
Bro awesome video but can u do a vifeo for how to define a custom comparison operator...😅
Great teacher! Thank you for the videos
My pleasure!
i have 2 questions:
1)what do the asscociative container ASSOCIATE those sorted values to?
2) what is "const auto& e" ?
0:57 the syntax used in for loop is valid in C++14 ?.... Extremely nice explaination 👌 and ajj pata chala app INDIAN ho 😂😍
Thanks dude..
Thank you for the great content!
Thanks
sir ,don't how you used for loop in program
for(const auto&e: Set){
cout
This is called range based for loop, google it.
@@CppNuts thank you
Now I know why OPERATOR in C++ exist and what purpose it have.
Great..
best in class !
Thanks..
What did you do with that bool???
And what's the syntax for templates in greater???
what does bool operator()(const Person& rhs) const do ?? if its "()" ?
i'd like to know too!!
its been a year did u find out?
Hi Rupesh,
why set is not sorted Person object on the basis of name(2nd argument),why on the basis of age(first argument)?
Is it possible to sort the set on the basis of 2nd argument?
Yes you can do it, you just need to use name instead of age.
@@CppNuts Thanks Rupesh.
hey man,
is there any container that provides uu-order feature such that order should not change at all ,if i am taking 7,3,1,4,2,9,10.....it should print exactly same 7,3,1,4,2,9,10?
Array, list, vector
Why set is called as associative container? Because there is no pair of key-value while storing data in set. This was asked in an interview.
for the bool operator < function, the age belongs to which object and rhs takes reference to which object?Thankyou very much
age is Left Hand side data member and rhs.age is datamember of Right hand side .
sir which ide you use for coding.
VS Code.
in the example , you have showed there the set is initiated . What if the set is not initiated? How can I input set from console ??
set.insert();
@@CppNuts thanks 💕
Thanks
Welcome
which ide are you using, can it be used on windows 10
This is VS Code.
I use sublime also.
it's an editor not an IDE
and it's cross platform
There's a risk to this code, if you enter two Persons with the same age, the second person will not be entered into the set because it will be considered a duplicate because of the age variable. So, how can we write the code to recognize that the constructor variables are different?
Hi @ryklin1 I come across your answer. Simply add an or condition in the operator function like this:
bool operator < ( const Person & rhs ) const { return ( age < rhs.age || name < rhs.name); }
it should work.
God You;
Thanks dude..
are you overloading < operator?
yes
I didn't understood how you used bool operator and what is this Person& rhs. Please explain .
can any one tell me where i can read about this i didn't understand this .....
bool operator < (const Person& rhs) const {return age
i dont know where you can read it, but here is my explanation....
greater is a tamplate class it self, now it has all operator overloaded into it, but they have used ascending logic, now if you want to use descending logic then you write your own greater function, and as data type of greater is Person it will take our provided logic instead of its own logic.
and in this line bool operator < (const Person& rhs) const {return age y) swap;
here that if condition will be replaced by ( age < rhs.age)
remeber we needed to do that because we are giving user defined data type otherwise you would not have to give this bool operator < (const Person& rhs) const {return age
Search "Operator Overloading C++"
9:25 its john bro , but great content
Thanks man.
I swear computer science is over kill. You Write a bunch of lines to console out a line lol
This is life.. :D
@@CppNuts what books do you reccomend
@@eduardo9163 well when i was in college they gave me some book and that time i didn't know english so it was like understanding english first and then programming. And when i understood english i never red any programming book. It just internet and stuff.
But i what i more emphasis is if you are beginner then just do some pattern printing and some other small programs. That should clear the doubts how to use your programming language and do what you want.
In 10:45 you did operator overloading..
can you explain why you have used 'const' in that line.. or what's the role of 'const' there..
you have used it twice in that line..
I have used Constant to says that I will not modify if I am receiving with reference
Correct me if i am wrong. If we have raw pointers as data members in our class, then we have to overload "operator==" because if we don't, the compiler will compare the pointer and not what it is pointing to and hence store it in the set, right?
Yes, you have to, because as it is not integral data types it's a user defined data type, which requires a way from user to be given that how to compare it. (And Set would need to know how to compare two elements in-order to place them according)
@@CppNuts yup, so we have to overload > and ==
@@CppNuts Never knew there was such a great channel on TH-cam. Keep growing 💪
Hey, how can I implement set class using templates, I want to write the methods, that I have done, not getting the idea about how to implement iterator for this
Man the video was great why do you so many ads . They suckkk!!!
It depends on TH-cam how many ads should come. Sorry for the inconvenience.
Good job mate!
Thank you! Cheers!
Pls. Explain Comparator and how we can define them in cpp file!!!!
Is any efficient way to insert a range of consecutive integers in a set ? If Yes then How?
you can pass iterator or array / vectors to set and it will automatically insert everything from vector or array.
Thnks man
Happy to help
Can somebody explain the loop const auto &e. Why it is const? And why we are reference variable?
What will be time complexity of getting
--set. end() iterator
can you explain in line 25 why you are using " const" and " & rhs"
it's not mandatory, just a good practice.
const makes the object immutable at compile time
since we're just comparing the objects and wont change the values we use const
rhs is the object which will be on the right hand side. u can call it anything. but people usually use this notation for operator overloading.
&rhs is the reference(address) of rhs. read Pass by Reference. ur not passing the actual variable but and address to the variable.
This along with the const wont have significant effects on small programs but good practice is definitely makes a difference in large programs.
@@darkinferno4687 thanks
can anyone explain what is this return{age
Hey, @CppNuts Can you please spare little time to explain how the line 25 26 functions. Thanks
hey! thankyou this explinantion teaches me a lot of things! i really liked it
Glad it was helpful!
If the data members in a user defined data type are private, do we pass the information the same way?
class Person {
private:
float age;
string name;
public:
};
Still like this when the data members are private?
set Set = { {30, “Rupesh”}, {25, “Hitesh”}};
Also, what if we have many float data members, that means it will take our input based on the order we declare the float data members in class?
hey dude make some videos on setuping vs code for c++
I believe there are so many videos for the same.
very well explained
Glad you think so!
hi bro thanks for the video.I have one doubt you are using set variable called Set. How 3 data of age and name are stored inside the same set without creating 3 different object name?
my understanding is are you overwriting the age and name variable with different data?
Didn't get the question.
@@CppNuts Thanks for replying... I mean you told that {30,"Rupesh},{25,"Hitesh"},{22,"jhon"}, are three objects. is that object or data?
could you please explain 25 line of code
bool operator < (const Person& rhs) const {return age< rhs.age;}
can you please explain why "const {...}" -> const is used? what is the need to use that?
thanks very much but i didn't understand what is the ' rhs ' word that you wrote it minute(10:50)
Right hand side
@@CppNuts What do you mean by Right hand side
@@CppNuts please if you can answer me i need that
You can use “obj” instead of rhs, it’s nothing.
so nicely explained! Thank you so much! :D
Glad it was helpful!
What is the use of lines 25,26 in the code , and you haven't made any explanation regarding those two lines(not the const part , it is the bool part)! I haven't understood what is being done there....!!! respond ASAP!!!!
Learn operator overloaded.
I have videos for that..
I got the for loop syntax.But Why did you use const keyword in the loop..
excellent tutorial,thank you
Glad you liked it
Ok now..how to take a particular set using a given value. For eg..given 22 I need the whole object back..how to do it?
You can a function like:
getValue(index) {
int count = 0;
if(index
Why we have used const in the loop??
Compiler does some kind of optimization, if we tell that the parameter is const.
I don't know why I am getting this error even after writing the same code as you have written!!
The error message is actually huge. Here is a small part of it:
D:/CodeBlocks/MinGW/lib/gcc/mingw32/5.1.0/include/c++/bits/stl_function.h:387:20: note: 'const Person' is not derived from 'const std::tuple'
{ return __x < __y; }
However, making the overloaded function as friend works fine
RIP jhon😂😂 it shld be joh.lol
Why are you using std:: everywhere if you'd write using namespace std at the beginning?????
what is bool operator
std::set needs some way to compare one object with another object because it has to create a tree inside and place these objects accordingly, so if you compare obj1
Why "pair" is not a Associative Container ?? 🧐🧐
Can you just describe about 'for(const auto&e: Set)'
whatever Set will hold would come one by one in "e" and in loop we can process "e", just like traditional loop.
why did they write const in front of return statement and in front of person& rhs
bool operator < (const Person& rhs) const {return age < rhs.age;}
while compiling, i get this error - non-aggregate type 'set' cannot be initialized with an initializer list
set Set = {1,2,5,4,3,1,2,3,4,5};
^ ~~~~~~~~~~~~~~~~~~~~~
Try online compiler, don't know why this error.
I did not understand bool operator .......................................... syntex.
what is this? plz someone explain.
What is rhs here?
Right hand side
could the comparator compare strings? Like where we used age to compare, could we use their name?
How is the initializer list for the "Person" class working without a parametrized constructor in the class?
Is it possible that you can share the file which are using for explanation?
In the line "for {const auto& e: Set}" while "Set" contains integer value then also "&" is used with "auto". I checked that the similar code will also work if "&" is removed. Then why will we give "&"? If "Set" contains string variable then also both with and without "&" the iteration will work. Can you please explain why there is an "&" needed, or if it "&" is not mandatory then what is the benefit of using it?
John *
can anyone tell me how is writing on the screen.
Secret :P
step 1: write down code in vs code,
step 2: take a screenshot of that.
step 3: import the screenshot in "openboard" s/w( or any digital board you like ) and explain whatever you want to explain.
To Know More Check Out: th-cam.com/video/3xlPxKzQiWU/w-d-xo.html
Hi, Your video is really good, but one thing why are you trying to make western accent.
When i am in good mood sometime it happens.
I think in c++ 98 some things don't work, like direct assigning values to vector instead of push_back.
Like what?
its john not jhon :p
:D
Enough with the greed, reduce the number of adds to 1. SERIOUSLY!!
Instead of paid courses, you are getting knowledge about few products in the market if you watch ads and thats all it takes to get it free. I would say it is a good deal. :P
@@CppNuts Fair👍🏻
please drop your accent it is irritating
:D can't..
whats with the fake accent tho
how do you recognize b/w fake and real?