Pointer tho another Object - c++

Question

I have a little problem .. I want to do car registration and i want to have owner(pointer to a Person object) but when i want to take the owner with get function i can't do that ... and this is mystery for me ... Maybe i have a little mistake somewhere and i can't find it .. Please help :)
class Person
{
friend class Cars;
public:
Person(){}
Person(uint8_t age, string name) :m_age(age), m_name(name)
{
m_idGener = s_idGenerator++;
}
int getId()
{
return m_idGener;
}
uint8_t getAge()
{
return m_age;
}
string getName()
{
return m_name;
}
private:
string m_name;
uint8_t m_age;
static int s_idGenerator;
int m_idGener;
};
class Cars:public Person
{
public:
Person *m_owner; // this is my pointer which i want to point to cars Object
it will stay public for the test after the test i will move it in the private section
Cars()
{
}
// getters and setters
Cars setOwner(Cars &object, Person &owner) // with this function i set the owner
{
object.m_owner = &owner;
}
Cars getOwner(Cars &object) /// here is my problem i can't take the owner
{
return *(object.m_owner); // but i can't take the owner
}
uint16_t getHorsePower()
{
return horsePower;
}
string getRegNumber()
{
return registrationNumber;
}
private:
string m_manufacturerName;
string modelName;
uint16_t horsePower;
string registrationNumber;
};
int Person::s_idGenerator = 0;

Answer 1

You have made more mistakes. At least the followings should be corrected:
Cars setOwner(Cars &object, .....
This method doest not return a value, so it should be void. The car object should be the object for which the method will be called, not a parameter.
Cars getOwner(Cars &object) /// here is my problem i can't take the owner
{
return *(object.m_owner); // but i can't take the owner
}
In this method I would change the return type to Person *, then return simply m_owner. Parameter is not needed.
A modified working example:
#include <string>
#include <iostream>
using namespace std;
class Person
{
friend class Cars;
public:
Person(){}
Person(uint8_t age, string name) :m_age(age), m_name(name)
{
m_idGener = s_idGenerator++;
}
int getId()
{
return m_idGener;
}
uint8_t getAge()
{
return m_age;
}
string getName()
{
return m_name;
}
private:
string m_name;
uint8_t m_age;
static int s_idGenerator;
int m_idGener;
};
class Cars:public Person
{
public:
Person *m_owner; // this is my pointer which i want to point to cars Object
// it will stay public for the test after the test i will move it in the private section
Cars()
{
}
// getters and setters
void setOwner(Person &owner) // with this function i set the owner
{
m_owner = &owner;
}
Person *getOwner() /// here is my problem i can't take the owner
{
return (m_owner); // but i can't take the owner
}
uint16_t getHorsePower()
{
return horsePower;
}
string getRegNumber()
{
return registrationNumber;
}
private:
string m_manufacturerName;
string modelName;
uint16_t horsePower;
string registrationNumber;
};
int Person::s_idGenerator = 0;
int main() {
Person p(5,"Bill");
Cars c;
c.setOwner(p);
cout << c.getOwner()->getName();
}

Answer 2

Here:
Cars setOwner(Cars &object, Person &owner) // with this function i set the owner
{
object.m_owner = &owner;
}
You declared out value type as "Cars" but you don't return anything.
And here:
Cars getOwner(Cars &object) /// here is my problem i can't take the owner
{
return *(object.m_owner); // but i can't take the owner
}
You want to return "Person" object but again you declared out value type as "Cars".
So you can change this functions like that:
First:
void setOwner(Cars &object, Person &owner);
Second:
Person getOwner(Cars &object);