privacy is dead

gistfile1.cpp

#include <iostream>

class Foo {
    private:
        int m_value;

    public:
        Foo(int i) : m_value(i) {};
        int get_value(void) { return m_value; };
};

class Bar {
    public:
        int m_value;
};

int main()
{
    Foo foo(1);
    Bar *p_bar = reinterpret_cast<Bar*>(&foo);

    std::cout << "foo value: " << (foo.get_value()) << std::endl;

    // This fails
    // foo.m = 2
    p_bar->m_value = 3;

    std::cout << "foo value: " << (foo.get_value()) << std::endl;

    return 0;
}