What is a Slot Argument?
A Slot argument is an interface that allows a signal to be connected to a specific slot (or to a set of slots).
When a signal is emitted, the slot can be called to receive and process any arguments attached to it. The slot can also be a function that is compiled or interpreted, either directly or as part of a class method.
A slot can be defined as private, virtual or protected. A private slot section is intended for classes that need to keep their connections very tight, with only the class itself able to connect signals to them.
The slot can take any number of arguments of any type, but cannot have default values and can never return a different type than the one it accepts. It is rarely wise to use custom types for slot arguments.
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When connecting a signal to a slot, Qt uses the standard C++ function call interface. In practice, this means that the connection is done asynchronously: the slot gets called when the signal's turn comes up. In this way, we do not have to worry about the slot's life-time, because it will be removed automatically when the signal emitter or (when the signal is connected to member function) receiver object is destroyed.
We pass the signal information to the slot as a last parameter when using the connect() function, and the slot will then call the appropriate signal emitter to receive it. This can be useful in some cases, but you should always make sure that the signal is compatible with the slot's arguments before connecting it to a slot.
Since the slot has a variable number of arguments, it may end up using the signal information in unexpected ways. This is why it's a good idea to set $passSignalInformation to false when connecting a signal to a slot.
This will prevent slots from trying to call methods on the signal that they were not expecting to. If you want to avoid this, you can use the QSignalMapper class.
The Slot argument can be used to implement the following functions: clos, reshape, swap and error. Unlike other generic functions, it can take a list of class object slots as arguments.
These functions can be implemented in any.cpp file, but the moc will generate a special type for them. This is required to ensure that the function calls are type safe.
When the Slot argument is emitted by a slot, it will have an extra copy of the object that it is emitting. This extra copy is then stored in the command object that the slot will call when it's time to do its job.
It is important to note, however, that this copy of the object will only be used once - when the slot is called. This makes the Slot argument a useful addition to the Qt library, as it allows you to easily implement many different signals and slots.
