Set c++ stl question

#1


Please explain this question

#include <bits/stdc++.h>
using namespace std;
int main()
{
sets;
pair<set::iterator, bool> ret;
s.insert(1);
s.insert(5);
s.insert(10);
s.insert(3);
ret = s.insert(10);
cout<<ret.second<<endl;
return 0;
}

Why not compilation error
#2

Hey which question are you talking about its a 3 hour webinar.

#include <bits/stdc++.h>

using namespace std;
int main() {
    set<bool> s;        // You declaration of set was wrong
    pair < set::iterator, bool > ret;
    s.insert(1);
    s.insert(5);
    s.insert(10);
    s.insert(3);
    ret = s.insert(10);
    cout << ret.second << endl;
    return 0;
}

This code is meant to show that the insert function in the set returns a pair that contains set:iterator and the value bool. The insert function is used to add new elements to the set. We have just depicted that the return value of set is a pair of set:iterator pointing to the element and value of element we just inserted.

For more info about set::insert function. You can check http://www.cplusplus.com/reference/set/set/insert/

2 Likes
#3

Sir this question was in c++ stl quiz, but in quiz section we don’t have the facility to ask the doubts so I asked it using webinar section of stl.

#4

As I already explained you s.insert() returns a pair of set:iterator and its value. So ret.second will have the value 10 acc. to your question.

#5

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