STL way of creating/filling std::set from std::vector

Question

I want to create and fill a set from the contents of a member variable of each entry of a vector. This is what I am doing:

struct S { int i; };

int main()
{
    std::vector<S*> structPtrs;

    // code to fill the above vector

    // create set from the above vector
    std::set<int> setInts;
    for (auto it = structPtrs.begin(); it != structPtrs.end(); ++it)
    {
        setInts.insert((*it)->i);
    }
}

Is there an STL way to do it? Or via any available method(s) in <algorithm>?

Answer 1

There is one other way you can do this. If you add conversion operator to int to your struct you can just use range constructor directly

#include <iostream>
#include <set>
#include <vector>
using namespace std;

struct test {int i; operator int() {return i;}};

int main() {
    vector<test> v;
        v.push_back(test{433});
        v.push_back(test{533});
        set<int> s(v.begin(), v.end());
        cout << *(++s.begin());
    return 0;
}

https://www.ideone.com/qJwtwc