#include <stdio.h>

class mixin_base {
public:
    mixin_base() : m_flags(0) {
        printf("in mixin_base constructor\n");
    }

    int m_flags;

protected:
    void set_mixin_flags(int flags) {
        m_flags |= flags;
        printf("mixin_base adding flags %x, now %x\n", flags, m_flags);
    }
};

template <typename T>
class mixin1 : public T, virtual public mixin_base {
public:
    mixin1() : mixin_base() {
        printf("in mixin1 constructor\n");
        set_mixin_flags(0x1);
    }
};

template <typename T>
class mixin2 : public T, virtual public mixin_base {
public:
    mixin2() : mixin_base() {
        printf("in mixin2 constructor\n");
        set_mixin_flags(0x2);
    }
};

class thing {
public:
    thing() {
        printf("in thing constructor\n");
    }
};

int main(int argc, char **argv) {
    mixin1< mixin2< thing > > x;
    printf("x flags: %x\n\n", x.m_flags);

    mixin2< mixin1< thing > > y;
    printf("y flags: %x\n\n", y.m_flags);

    mixin1< thing > z;
    printf("z flags: %x\n", z.m_flags);

    return 0;
}