Passing arrays of pointers in C++

Question

Not sure what I'm doing wrong here. I'm trying to add a new element and up until the function ends it appears to have worked. But once I try to access anything in it after I get a segmentation fault.

This is just sample code I'm using to try and figure out what I'm doing wrong, with console output to help determine current values.

#include <iomanip>
#include <iostream>

using namespace std;


class foo
    {
    private:
    int z;
    public:
    foo(int);
    int getz();
    void setz(int);
    };

    foo::foo(int zz)
    {
        z = zz;
    }

    int foo::getz()
    {
        return z;
    }

    void foo::setz(int zz)
    {
        z = zz;
    }

void boo(foo** x, unsigned* n)
{
    foo** b = new foo*[3];

    for (int i=0; i<2; i++)
        b[i] = x[i];
    b[2] = new foo(5);
    cout << x[0]->getz() << x[1]->getz();
    delete[]x;
    x = b;
    cout << x[0]->getz() << ' ' << x[1]->getz() << ' ' << x[2]->getz();
    b = nullptr;
    (*n)++;
}

int main() {
    
    foo** a = new foo*[2];
    unsigned s = 2;

    a[0] = new foo(1);
    a[1] = new foo(2);
    boo(a, &s);
    cout << s;
    cout << a[0]->getz();
    return 0;
}