std::vector<int> arr;

    arr.push_back(0); arr.push_back(1); arr.push_back(2);

    std::vector<int>::iterator it    = arr.begin();
    std::vector<int>::iterator itEnd = arr.end();

    auto oFn = [](const int& n) { return 2 <= n; };

    if ( std::find_if<std::vector<int>::iterator&, decltype(oFn)>(it, itEnd, oFn) != itEnd )
    {
        *it = 5;
    }