What is QMetaMethod?
The QMetaMethod class provides meta-data about a member function.
What are QObjects?
QObject is the heart of the Qt object model. The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. You can connect a signal to a slot with connect() and destroy the connection with disconnect().
What is Q_enum?
Q_ENUM is like the old Q_ENUMS but with those differences: It needs to be placed after the enum in the source code. Only one enum can be put in the macro. It enables QMetaEnum::fromType() . These enums are automatically declared as a QMetaTypes (no need to add them in Q_DECLARE_METATYPE anymore).
What is Qobject_cast?
qobject_cast is same thing as dynamic_cast , but works only for children of QObject . It doesn’t require RTTI and it works much faster, because it is not possible to use QObject in multiple inheritance. Don’t hesitate to do self-research and to read some basic things about OOP and C++.
What is Q_invokable in Qt?
Q_INVOKABLE simply marks a method to be callable via moc (and thus also via QML for example), nothing more. Similar to slots for example.
When to use index ofmethod in Qt?
For example, Qt uses indexOfMethod () internally when you connect a signal to a slot. Classes can also have a list of name — value pairs of additional class information, stored in QMetaClassInfo objects.
When does a qmetaobject return true in Qt?
Returns true if the class described by this QMetaObject inherits the type described by metaObject; otherwise returns false. A type is considered to inherit itself. This function was introduced in Qt 5.7. Invokes the member (a signal or a slot name) on the object obj. Returns true if the member could be invoked.
How does the qmetatype function in Qt work?
Constructs a value of the type that this QMetaType instance was constructed for in the existing memory addressed by where, that is a copy of copy, and returns where. If copy is zero, the value is default constructed. This is a low-level function for explicitly managing the memory used to store the type.
What is the default parameter in Qt 5.15?
Constructs a QMetaType object that contains all information about type typeId. Note: The default parameter was added in Qt 5.15. This function was introduced in Qt 5.0. Destructs this object. Compares the objects at lhs and rhs.