int main(){
    Status_List s_list;

    s_list.add_status("Blind", 2);
    s_list.add_status("Stun", 5);
    s_list.add_status("Deaf", 3);
    s_list.add_status("Weak", 4);
    print_status(s_list);

    for(int i = 0; i < 5; ++i){
        --s_list;
        print_status(s_list);
    }

    return 0;
}

void print_status(Status_List s_list){
    for(int i = 0; i < s_list.status.size(); ++i){
        std::cout << s_list.status[i]->get_eff() << ", " << s_list.status[i]->get_dur() << std::endl;
    }
}

Status_List& Status_List::operator--(){
    int i = 0;

    while(i < status.size()){
        if(status[i]->get_dur() <= 1)
            rem_status(i);
        else{
            status[i]->dec();
            ++i;
        }
    }

    return *this;
}

Status_List Status_List::operator--(int){
    Status_List tmp(*this);
    operator--();
    return tmp;
}

class Status{
 public:
	Status(std::string eff = "", short dur = 0) : effect(eff), duration(dur) {}

	void dec() {duration--;}
	short get_dur() {return duration;}
	std::string get_eff() {return effect;}

 private:
	std::string effect;
	short duration;
};

class Status_List{
 public:
	~Status_List();

	void add_status(std::string, short);
	Status_List& operator--();
	Status_List operator--(int);

	friend void print_status(Status_List);

 private:
	std::vector<Status *> status;

	void rem_status(int);
};

...

void Status_List::rem_status(int index){
	Status * stat = status[index];
	status.erase(status.begin() + index);
	delete stat;
}