#include <vector>
#include <functional>
#include <algorithm>

void f(std::function<std::vector<int>::iterator (int)>) {}

int main()
{
    std::vector<int> v{0, 1, 2, 3};

    auto p = [&] (int n) {
        return std::find(v.begin(), v.end(), n);
    };

    f(p);
}