CODEWITHSUNDEEP
c++
Alok
Alok

Reputation: 2035

Can i copy 'vector' elements in 'set' using the copy algorithm?

I am getting the run time error in following code. Please let me know can i copy vector elements in set?

#include <iostream>
#include <vector>
#include <set>
using namespace std;
int main()
{
    vector<int> v;
    set<int> kk;
    set<int>::iterator itr;
    for (int i = 0; i < 6; i++)
    {
        v.push_back(i * 2);
    }
    copy(v.begin(), v.end(), inserter(kk, itr));
}

Upvotes: 21

Views: 29172

Answers (4)

johnsyweb
johnsyweb

Reputation: 141810

You are not initialising itr:

set<int>::iterator itr = kk.begin();

Or remove itr entirely:

copy(v.begin(), v.end(), inserter(kk, kk.begin()));

In this instance, you could simply initialise kk thus (but if you want to add to kk follow the line above):

set<int> kk(v.begin(), v.end());

Upvotes: 32

Karl Knechtel
Karl Knechtel

Reputation: 61519

If the goal is to create a set from the vector elements (rather than update an already existing set that might have some elements in it), then do that, by using the constructor:

set<int> s(v.begin(), v.end());

Upvotes: 17

Loki Astari
Loki Astari

Reputation: 264411

Try:

copy(v.begin(), v.end(),inserter(kk, kk.end() ));  
                                  // ^^^^^^^^  You need a real iterator.

Upvotes: 2

joncham
joncham

Reputation: 1614

You need to initialize the iterator.

set<int>::iterator itr = kk.end();

Upvotes: 2

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