gistfile1.txt

#include <iostream>
#include <memory>

class Foobar
{
private:
    int _array[10];
public:
    Foobar() {
        for( int i=0; i<10; i+=1)
            _array[i] = i;
    }
    int Get(int index) {
        return _array[index];
    }
    void Set(int index, int value) {
        _array[index] = value;
    }
};

class Apple
{
private:
    std::shared_ptr<Foobar> _foobar;
public:
    Apple(std::shared_ptr<Foobar> foobar)
    : _foobar(foobar)
    {
    }
    void Print() {
        std::cout << "Apple::Print\n";
        for( int i=0; i<10; i+=1)
            std::cout << _foobar->Get(i) << " ";
        std::cout << "\n";
    }
};

class Pear
{
private:
    std::shared_ptr<Foobar> _foobar;
public:
    Pear(std::shared_ptr<Foobar> foobar)
    : _foobar(foobar)
    {
    }
    void Modify() {
        _foobar->Set(0, 100);
    }
};

int main() {
    auto foobar = std::make_shared<Foobar>();
    Apple apple(foobar);
    Pear pear(foobar);
    apple.Print();
    pear.Modify();
    apple.Print();
}