Custom order of ints

#include <queue>
#include <iostream>

class IntOrder{
public:
    bool operator() (int a, int b) const {return o[a%o.size()]<o[b%o.size()];}
protected:
    std::vector<int> o = {0,2,4,6,8};
};

class Foo{
public:
    Foo(IntOrder o, std::vector<int> ints){
        this->o = o;

        for(auto i:ints)
            h.push(i);
    }
protected:
    IntOrder o;
    std::priority_queue<int, std::vector<int>, IntOrder> h;
};

int main() {
    std::vector<int> ints = {0,1,2,3,4,5,6,7,8,9};

    auto foo = new Foo(IntOrder(), ints);
    return 0;
}