Vector Isn't Creating Multiple Class Objects - c++

Question

I have a vector that stores multiple class objects for later access. This way my program can create new objects during runtime. This is done like so:
vector<Person> peopleVector;
peopleVector.push_back(Person(name, age));
for (int i = 0; i < peopleVector.size(); i++) {
cout << peopleVector[i].name << endl;
}
This function should print out each objects "name" every time the code runs (it's a function that runs multiple times). However, when I run this, somehow the vector does not increase in size. If you add cout << peopleVector.size(); to that code, you will find that each time it runs, it gets one (obviously assuming you also have the class code which I have below).
I'm curious why I can't create multiple objects in the class.
Class.h
#pragma once
#include <iostream>
using namespace std;
class Person {
public:
Person(string personName, int personAge);
string name;
int age;
};
Person::Person(string personName, int personAge) {
name = personName;
age = personAge;
}
Main.cpp
#include "Class.h"
#include <random>
int main() {
// Necessary for random numbers
srand(time(0));
string name = names[rand() % 82]; // Array with a lot of names
int age = 4 + (rand() % 95);
}
// Create a new person
void newPerson(string name, int age) {
vector<Person> peopleVector;
peopleVector.push_back(Person(name, age));
for (int i = 0; i < peopleVector.size(); i++) {
cout << peopleVector[i].name << endl;
}
}
Just FYI those #includes might be a little bit off because I took that code out of a large section that had like 15 includes.

Answer 1

You are creating an empty vector each time you call your newPerson() function, and then you add a single person to it.
You then display the contents of that vector. What else can it contain, other than the single person that you added?

Answer 2

Problem
Every time a function runs, all local variables inside the function are re-created in their default state. That means that every time you call newPerson, it just recreates peopleVector.
Solution
There are two solutions:
Have newPerson take a reference to a vector, and add it on to that
make peopleVector static, so that it isn't re-initialized every time
First solution:
// Create a new person; add it to peopleVector
// The function takes a reference to the vector you want to add it to
void newPerson(string name, int age, vector<Person>& peopleVector) {
peopleVector.push_back(Person(name, age));
for (int i = 0; i < peopleVector.size(); i++) {
cout << peopleVector[i].name << endl;
}
}
Second solution: mark peopleVector as static
// create a new person; add it to peopleVector
void newPerson(string name, int age) {
// Marking peopleVector as static prevents it from being re-initialized
static vector<Person> peopleVector;
peopleVector.push_back(Person(name, age));
for (int i = 0; i < peopleVector.size(); i++) {
cout << peopleVector[i].name << endl;
}
}