qobject_cast
... *layout = new QVBoxLayout; layout->inherits("QObject"); // returns true layout->inherits("QLayoutItem"); // returns true (even though QLayoutItem is not a QObject). If you need to determine whether an object is an instance of,Hello all, I am trying to understand why I should prefer qobject_cast over dynamic_cast in certain situations. Based on these three references: http://doc.qt.io/qt-4.8/metaobjects.html http://doc.qt.io/qt-4.8/qobject.html#qobject_cast http://www.ics.com..
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 qobject_cast 相關參考資料
c++ - What is qobject_cast? - Stack Overflow
QObject::connect( btn, &QPushButton::clicked, this, &MyClass::onClicked ); void MyClass::onClicked() // How to get pointer to a button: QObject *p = sender(); // It's QObject. Now we nee... https://stackoverflow.com QObject Class | Qt Core 5.10 - Qt Documentation
... *layout = new QVBoxLayout; layout->inherits("QObject"); // returns true layout->inherits("QLayoutItem"); // returns true (even though QLayoutItem is not a QObject). If yo... http://doc.qt.io qobject_cast() vs dynamic_cast() | Qt Forum
Hello all, I am trying to understand why I should prefer qobject_cast over dynamic_cast in certain situations. Based on these three references: http://doc.qt.io/qt-4.8/metaobjects.html http://doc.qt.i... https://forum.qt.io qobject_cast用法- CSDN博客
函数原型： T qobject_cast ( QObject * object ) 本方法返回object向下的转型T，如果转型不成功则返回0，如果传入的object本身就是0则返回0。 在使用时有两个限制： 1# T类型必须继承自QObject。 2# 在声明时必须有Q_OBJECT宏。 使用场景： 当某一个Objec. https://blog.csdn.net qobject_cast用法| masikkk
qobject_cast用法. 函数原型. T qobject_cast ( QObject * object ) 本方法返回object向下的转型T，如果转型不成功则返回0，如果传入的object本身就是0则返回0。 在使用时有两个限制：. T类型必须继承自QObject。 在声明时必须有Q_OBJECT宏。 使用场景当某一个Object emit一个signal的时候，它就是一个sender，... http://masikkk.com Qt qobject_cast用法向下转型- CSDN博客
函数原型： T qobject_cast ( QObject * object ) 本方法返回object向下的转型T，如果转型不成功则返回0，如果传入的object本身就是0则返回0。 在使用时有两个限制： 1# T类型必须继承自QObject。 2# 在声明时必须有Q_OBJECT宏。 使用场景： 当某一个Objec. https://blog.csdn.net Qt 之qobject_cast 分析及QTBUG 20616 - CSDN博客
适用范围qobject_cast 用于两种情况： QObject 及其派生类，且定义时使用了Q_OBJECTQ_DECLARE_INTERFACE 声明的接口类(不需要是QObject的派生类) 问题：如果既是QObject派生类，又用Q_DECLARE_INTE. https://blog.csdn.net The Meta-Object System | Qt 4.8 - Qt Documentation
It is also possible to perform dynamic casts using qobject_cast() on QObject classes. The qobject_cast() function behaves similarly to the standard C++ dynamic_cast() , with the advantages that it doe... http://doc.qt.io The Meta-Object System | Qt Core 5.10 - Qt Documentation
It is also possible to perform dynamic casts using qobject_cast() on QObject classes. The qobject_cast() function behaves similarly to the standard C++ dynamic_cast() , with the advantages that it doe... http://doc.qt.io |