Member function doesn't work when using pointer to class - c++

Question

Scenario: I have two classes, each contains a pointer to the other (when using them, being able to refer to the other is going to be important so I deemed this appropriate). When I try accessing a private variable from one class via using the pointer to the other and a getter function inside that, it works perfectly.
Problem: Using a setter (in this case, addPoints)/manipulating the variables however leads to no result.
I'm new so anything here might be "improper etiquette" and bad practice. Feel free to point them out! But please also try to provide a solution. This is also my first question on SO, so please be gentle!
Related code pieces:
Team.h
#include "Driver.h"
using namespace std;
class Team {
int Points = 0;
vector<Driver*> Drivers;
public:
void addPoints(int gained); //does not work
int getPoints(); //works perfectly
Driver getDriver(int nr);
void setInstance(vector<Driver*> drivers);
};
Team.cpp
#include "Team.h"
#include "Driver.h"
using namespace std;
void Team::addPoints(int gained) {
this->Points = this->Points + gained;
}
int Team::getPoints() {
return this->Points;
}
Driver Team::getDriver(int nr) {
return *Drivers[nr];
}
void Team::setInstance(vector<Driver*> drivers) {
this->Drivers = drivers;
}
Driver.h
using namespace std;
class Team;
class Driver {
int Points = 0;
Team* DriversTeam;
public:
void SetTeam(Team& team);
Team getTeam();
int getPoints(); //works
void addPoints(int gained); //doesn't work
};
Driver.cpp
#include "Driver.h"
#include "Team.h"
using namespace std;
void Driver::SetTeam(::Team& team) {
this->DriversTeam = &team;
}
Team Driver::getTeam() {
return *DriversTeam;
}
int Driver::getPoints() {
return this->Points;
}
void Driver::addPoints(int gained) {
this->Points = this->Points + gained;
}
Initializer.cpp (linking drivers to teams)
void InitializeData(vector<Team>& teams, vector<Driver> &drivers) {
//(...)
//reads each team in from data file to memory
//key part:
vector<Driver*> teamsDrivers;
for (auto& iter : drivers) { //this loop mainly determines which driver to link with which teams
if (iter.getName().compare(values[4]) == 0) { //values is csv line data in a string vector. I guess not the prettiest parsing method here but will be revised
teamsDrivers.push_back(&iter);
}else if(iter.getName().compare(values[5]) == 0) {
teamsDrivers.push_back(&iter);
}
}
tempTeam.setInstance(teamsDrivers);
teams.push_back(tempTeam);
}
(linking driver to team)
//drivers are linked to teams last, as they are declared first (so I cannot link them to the yet nonexisting teams)
void LinkTeam(vector<Driver>& drivers, vector<Team>& teams) {
for (auto& driverIter : drivers) { //iterate through drivers
for (auto& teamIter : teams) { // iterate through teams
bool found = 0;
for (size_t i = 0; i < teamIter.DriverAmount(); i++) {
if (driverIter.getName() == teamIter.getDriver(i).getName()) {
driverIter.SetTeam(teamIter);
found = 1;
break;
}
}
if (found) { //exit iterating if driver is found
break;
}
}
}
}
Example of use in main.cpp
teams[0].addPoints(10);
drivers[3].getTeam().addPoints(15); //driver 3 is linked to team 0
cout << teams[0].getPoints(); //15
cout << drivers[3].getTeam().getPoints(); //15
teams[0].getDriver(1).addPoints(20); //driver 1 of team 0=driver[3]
drivers[3].addPoints(25);
cout << drivers[3].getPoints(); //25
cout << teams[0].getDriver(1).getPoints(); //25
Thanks for the help in advance.

Answer 1

This is quite simple:
Your getTeam() and getDriver() functions are returning copies of the objects, not references, so the addPoints() are performed on temporary copies and not the real ones.
To fix it, simply change the return types to references (add &):
Team& getTeam();
and
Driver& getDriver();