Q_Q Q_D Q_OBJECT

 

qglobal.h里面的

 

#define Q_DECLARE_PRIVATE(Class) \
    inline Class##Private* d_func() { return reinterpret_cast<Class##Private *>(d_ptr); } \
    inline const Class##Private* d_func() const { return reinterpret_cast<const Class##Private *>(d_ptr); } \
    friend class Class##Private;
#define Q_DECLARE_PUBLIC(Class) \
    inline Class* q_func() { return static_cast<Class *>(q_ptr); } \
    inline const Class* q_func() const { return static_cast<const Class *>(q_ptr); } \
    friend class Class;
#define Q_D(Class) Class##Private * const d = d_func()
#define Q_Q(Class) Class * const q = q_func()

 

//下面的是在qobject.h里面的 ,主要看QObject *q_ptr;

 

class QObjectData {
public:
    virtual ~QObjectData() = 0;
    QObject *q_ptr;
    QObject *parent;
    QObjectList children;

    uint isWidget : 1;
    uint pendTimer : 1;
    uint blockSig : 1;
    uint wasDeleted : 1;
    uint ownObjectName : 1;
    uint sendChildEvents : 1;
    uint receiveChildEvents : 1;
    uint unused : 25;
    int postedEvents;
};


//下面的也是在qobject.h里面的 ,主要看QObjectData *d_ptr;

class Q_CORE_EXPORT QObject
{
    Q_OBJECT
    Q_PROPERTY(QString objectName READ objectName WRITE setObjectName)
    Q_DECLARE_PRIVATE(QObject)

....... //省略一部分

protected:
    QObject(QObjectPrivate &dd, QObject *parent = 0);

protected:
    QObjectData *d_ptr;

    static const QMetaObject staticQtMetaObject;

    friend struct QMetaObject;
    friend class QApplication;
    friend class QApplicationPrivate;
    friend class QCoreApplication;
    friend class QCoreApplicationPrivate;
    friend class QWidget;
    friend class QThreadData;

private:
    Q_DISABLE_COPY(QObject)
    Q_PRIVATE_SLOT(d_func(), void _q_reregisterTimers(void *))
};

 

 

qobjectdefs.h里面的

 

#define Q_OBJECT \
public: \
    Q_OBJECT_CHECK \
    static const QMetaObject staticMetaObject; \
    virtual const QMetaObject *metaObject() const; \
    virtual void *qt_metacast(const char *); \
    QT_TR_FUNCTIONS \
    virtual int qt_metacall(QMetaObject::Call, int, void **); \
private:

 

 

继续看 Q_OBJECT_CHECK 和 QT_TR_FUNCTIONS 也是在qobjectdefs.h里面的

 

 

#define Q_OBJECT_CHECK \
    template <typename T> inline void qt_check_for_QOBJECT_macro(const T &_q_argument) const \
    { int i = qYouForgotTheQ_OBJECT_Macro(this, &_q_argument); Q_UNUSED(i); }
template <typename T>
inline int qYouForgotTheQ_OBJECT_Macro(T, T) { return 0; }
template <typename T1, typename T2>
inline void qYouForgotTheQ_OBJECT_Macro(T1, T2) {}

 

#ifndef QT_NO_TRANSLATION
# ifndef QT_NO_TEXTCODEC
// full set of tr functions
// ### Qt 5: merge overloads
#  define QT_TR_FUNCTIONS \
    static inline QString tr(const char *s, const char *c = 0) \
        { return staticMetaObject.tr(s, c); } \
    static inline QString trUtf8(const char *s, const char *c = 0) \
        { return staticMetaObject.trUtf8(s, c); } \
    static inline QString tr(const char *s, const char *c, int n) \
        { return staticMetaObject.tr(s, c, n); } \
    static inline QString trUtf8(const char *s, const char *c, int n) \
        { return staticMetaObject.trUtf8(s, c, n); }
# else
// no QTextCodec, no utf8
// ### Qt 5: merge overloads
#  define QT_TR_FUNCTIONS \
    static inline QString tr(const char *s, const char *c = 0) \
        { return staticMetaObject.tr(s, c); } \
    static inline QString tr(const char *s, const char *c, int n) \
        { return staticMetaObject.tr(s, c, n); }
# endif
#else
// inherit the ones from QObject
# define QT_TR_FUNCTIONS
#endif