Class ref

tests/object.h:67–203

 */
template <typename T>
class ref {
public:
    /// Create a nullptr reference
    ref() : m_ptr(nullptr) {
        print_default_created(this);
        track_default_created((ref_tag *) this);
    }

    /// Construct a reference from a pointer
    explicit ref(T *ptr) : m_ptr(ptr) {
        if (m_ptr) {
            ((Object *) m_ptr)->incRef();
        }

        print_created(this, "from pointer", m_ptr);
        track_created((ref_tag *) this, "from pointer");
    }

    /// Copy constructor
    ref(const ref &r) : m_ptr(r.m_ptr) {
        if (m_ptr) {
            ((Object *) m_ptr)->incRef();
        }

        print_copy_created(this, "with pointer", m_ptr);
        track_copy_created((ref_tag *) this);
    }

    /// Move constructor
    ref(ref &&r) noexcept : m_ptr(r.m_ptr) {
        r.m_ptr = nullptr;

        print_move_created(this, "with pointer", m_ptr);
        track_move_created((ref_tag *) this);
    }

    /// Destroy this reference
    ~ref() {
        if (m_ptr) {
            ((Object *) m_ptr)->decRef();
        }

        print_destroyed(this);
        track_destroyed((ref_tag *) this);
    }

    /// Move another reference into the current one
    ref &operator=(ref &&r) noexcept {
        print_move_assigned(this, "pointer", r.m_ptr);
        track_move_assigned((ref_tag *) this);

        if (*this == r) {
            return *this;
        }
        if (m_ptr) {
            ((Object *) m_ptr)->decRef();
        }
        m_ptr = r.m_ptr;