finding max value of a struct construction inside vector c++

enum class comp {
    age,
    weight
};
struct person {
    int age;
    int weight;
    static auto max(std::vector<person> x, comp(y)) {
        if (comp(y) == comp::age) {
            for (person e : x) {
                auto max = 0;
                for (card e : x) {
                    if (max < e)
                        max = e;
                }

            }
        }

i am trying to find the max value of age, weight from this vector of a struct construction.

>Solution :

here is a corrected version of your code. As cory post shows you can do this with standard algorithms in a much cleaner way

struct person {
    int age;
    int weight;
    static int max(std::vector<person> x, comp y) {
        if (y == comp::age) {
            for (person e : x) {
                auto max = 0;
                for (auto e : x) {
                    if (max < e.age)
                        max = e.age;
                }
               return max;
            }
        }
        return 0;
    }
};
int main()
{
   person p1;
   person p2;
   p1.age=42;
   p2.age=4;
   std::vector<person> pp{p1,p2};
   int maxAge = person::max(pp, comp::age);

}