more detailed version of object suicide

suicide2.cpp

#include <iostream>
#include <memory>
#include <utility>
#include <string>
#include <vector>

class human;
typedef std::unique_ptr<human> human_ptr;
typedef std::vector<human_ptr> human_vector;

class house {
public:
    
    house(const int& _houseID) : houseID(_houseID) {
        std::cout << "house " << houseID << " being born at " << this << std::endl;
    };
    ~house(){
        std::cout << "house " << houseID << " being killed at " << this << std::endl;
    };
    
    void            add_human(human_ptr h){
        humans.push_back(std::move(h));
    };
    human_vector&   get_humans(){ return humans; };
    
private:
    int             houseID;
    human_vector    humans;
};

class human {
public:
    /* constructor */
    human(std::string _x, house* _h): x(_x), h(_h) {
        std::cout << "human " << x << " being born at " << this << std::endl;
    };
    /* destructor */
    ~human(){
        std::cout << "human " << x << " being killed at " << this << std::endl;
    };
    /* suicide */
    void suicide(){
        std::cout << "human " << x << " suiciding at " << this << std::endl;
        for(auto it = h->get_humans().begin(); it != h->get_humans().end(); it++){
            if(it->get() == this){
                std::cout << "i found myself!" << std::endl;
                h->get_humans().erase(it);
            }
        }

    };
    void hi(){
        std::cout << "human " << x << " says hi " << std::endl;
    };
    
    /* print out human */
    friend std::ostream& operator<<(std::ostream& os, human& h) {
        return os << "human " << h.x << " says hi"  << std::endl;
    }
private:
    std::string x;
    house* h;
};

int main(){
    
    house aHouse(1);
    
    human_ptr bob = std::make_unique<human>("bob",&aHouse);
    human_ptr alice = std::make_unique<human>("alice",&aHouse);
    
    aHouse.add_human(std::move(bob));
    aHouse.add_human(std::move(alice));
    aHouse.add_human(std::make_unique<human>("carol",&aHouse));
    
    std::cout << "there are " << aHouse.get_humans().size() << " humans in the house" << std::endl;

    aHouse.get_humans().front()->suicide();
    
    std::cout << "there are " << aHouse.get_humans().size() << " humans in the house" << std::endl;

    std::unique_ptr<house> house2 = std::make_unique<house>(2);
    human_ptr grace = std::make_unique<human>("grace",house2.get());
    house2->add_human(std::move(grace));
    for(auto &h : house2->get_humans()){
        h->hi();
    };
    
    return 0;
}