Qt源码分析--QObject(1)

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于 2022-05-16 16:08:49 发布 · 825 阅读

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#qt #开发语言 #c++

解析QObject的构造函数，探讨其如何处理parent关系及线程数据，并重点剖析析构函数中删除connection的过程。了解QObject对象的创建、销毁及其在多线程环境中的行为。

1.Q_INVOKABLE explicit QObject(QObject *parent=nullptr);

QObject::QObject(QObject *parent)
    : d_ptr(new QObjectPrivate)
{
    Q_ASSERT_X(this != parent, Q_FUNC_INFO, "Cannot parent a QObject to itself");
    Q_D(QObject);
    d_ptr->q_ptr = this;
    d->threadData = (parent && !parent->thread()) ? parent->d_func()->threadData : QThreadData::current();
    d->threadData->ref();
    if (parent) {
        QT_TRY {
            if (!check_parent_thread(parent, parent ? parent->d_func()->threadData : 0, d->threadData))
                parent = 0;
            setParent(parent);
        } QT_CATCH(...) {
            d->threadData->deref();
            QT_RETHROW;
        }
    }
#if QT_VERSION < 0x60000
    qt_addObject(this);
#endif
    if (Q_UNLIKELY(qtHookData[QHooks::AddQObject]))
        reinterpret_cast<QHooks::AddQObjectCallback>(qtHookData[QHooks::AddQObject])(this);
    Q_TRACE(QObject_ctor, this);
}

如果parent不为空，则设置