CODEWITHSUNDEEP
c++stlset
Andy
Andy

Reputation: 155

Set intersection not working

I'm trying to make the intersection of two sets using the following code and if the result is different than the empty set i want to insert the first of my sets into a set of sets.

    std::set<int> set1,set2;
    std::set<set<int> > result;
    std::set<int> intersection;
             set_intersection(set1.begin(),set1.end(),set2.begin(),set2.end(),std::back_inserter(intersection));
                if(!intersection.empty()) result.insert(set1);

However i get the following error: 'class std::set' has no member named 'push_back'. What is the problem? Thanks in advance.

Upvotes: 1

Views: 915

Answers (1)

R Sahu
R Sahu

Reputation: 206567

std::back_inserter uses std::back_inserter_iterator, which calls push_back() on the container.

Use std::inserter when the output is an std::set.

 std::set<int> set1,set2;
 std::set<int> intersection;
 std::set_intersection(set1.begin(),set1.end(),set2.begin(),set2.end(),
                       std::inserter(intersection, intersection.begin()));

Upvotes: 2

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