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Adjusting the value of one object in a vector based off of the value of another object in a different vector...

Areks (1)
So I've got one vector with all my citizens and another vector with all my cities. What I would like to happen is to have the population of a settlement be a result of the number of citizens that have that city's ID as their residence, if that makes sense.

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Population Definition

     #ifndef POPULATION_H
     #define POPULATION_H

     #include <iostream>
     #include <string>
     #include <vector>

     using namespace std;

     class population
     {
     public:
        //Default Constructor
        population();

        //Overload Constructors
        population(int, string, string, string, int, string, int, string, string, int, string, int, int, int, int, int, int, int, int, bool);
        population(int);

        //Destructor
        ~population();

        //Accessor Function
        int getNumber() const;
        string getName() const;
        string getGender() const;
        string getRace() const;
        int getAge() const;
        string getMarried() const;
        int getMarriedCount() const;
        string getSpouse() const;
        string getSurname() const;
        int getFamilyCount() const;
        string getEconType() const;
        int getEconPower() const;
        int getResidence() const;
        int getStr() const;
        int getDex() const;
        int getCon() const;
        int getInt() const;
        int getWis() const;
        int getCha() const;
		bool getAlive() const;

        //Mutator Functions
        void setNumber(int);
        void setName(string);
        void setGender(string);
        void setRace(string);
        void setAge(int);
        void setMarried(string);
        void setMarriedCount(int);
        void setSpouse(string);
        void setSurname(string);
        void setFamilyCount(int);
        void setEconType(string);
        void setEconPower(int);
        void setResidence(int);
        void setStr(int);
        void setDex(int);
        void setCon(int);
        void setInt(int);
        void setWis(int);
        void setCha(int);
		void setAlive(bool);



    private:
        //Member Variables
        int newNumber;
        string newName;
        string newGender;
        string newRace;
        int newAge;
        string newMarried;
        int newMarriedCount;
        string newSpouse;
        string newSurname;
        int newFamilyCount;
        string newEconType;
        int newEconPower;
        int newResidence;
        int newStr;
        int newDex;
        int newCon;
        int newInt;
        int newWis;
        int newCha;
		bool newAlive;

     };
    #endif // POPULATION_H
 
Settlements Definition

     #ifndef SETTLEMENTS_H
     #define SETTLEMENTS_H
     #include <iostream>
     #include <string>
     #include <vector>
     #include "population.h"

     using namespace std;

     class settlements
     {
    public:
        //Default Constructor
        settlements();

        //Overload Constructors
        settlements(int number, string name, int popCount, string align, string type, int servRating, int dockRating, int laborRating, int commRating, int healRating, int relRating, int govRating, int milRating, int crimeRating);
        settlements(int);

        //Destructor
        ~settlements();

        //Accessor Function
        int getNumber() const;
        string getName() const;
        int getPopCount() const;
        string getAlign() const;
        string getType() const;
        int getServRating() const;
        int getDockRating() const;
        int getLaborRating() const;
        int getCommRating() const;
        int getHealRating() const;
        int getRelRating() const;
        int getGovRating() const;
        int getMilRating() const;
        int getCrimeRating() const;

        //Mutator Functions
        void setNumber(int);
        void setName(string);
        void setPopCount(int);
        void setAlign(string);
        void setType(string);
        void setServRating(int);
        void setDockRating(int);
        void setLaborRating(int);
        void setCommRating(int);
        void setHealRating(int);
        void setRelRating(int);
        void setGovRating(int);
        void setMilRating(int);
        void setCrimeRating(int);
        void popUpkeep(vector<population>& world, vector<settlements>& cities);

    private:
        //Member Variables
        int newNumber;
        string newName;
        int newPopCount;
        string newAlign;
        string newType;
        int newServRating;
        int newDockRating;
        int newLaborRating;
        int newCommRating;
        int newHealRating;
        int newRelRating;
        int newGovRating;
        int newMilRating;
        int newCrimeRating;

     };
     #endif // SETTLEMENTS_H

--------------------------------------------------------------------------------
Function to set upkeep the settlement population with the number of citizens that have been identified as having that settlement as their home.


     void settlements::popUpkeep(vector<population>& newWorld, vector<settlements>& newCities){
    for(int x = 0; x < newCities.size(); x++){
        for(int i = 0; i < newWorld.size(); i++){
            if(newWorld[i].getResidence == newCities[x].getNumber()){
                newCities[x].setPopCount() = newCities[x].getPopCount() + 1;
                }
            }
         }
      }
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