In Qt, memory management is done through the use of parent-child relationships. When a QObject is created, it can be assigned a parent QObject. When the parent QObject is destroyed, it will automatically destroy all of its child QObjects. This helps to prevent memory leaks and ensures that all objects are properly cleaned up when they are no longer needed.
A smart pointer is a type of pointer that automatically manages the memory of the object it points to. There are several types of smart pointers in C++, including unique_ptr, shared_ptr, and weak_ptr. Smart pointers are useful when you need to manage the lifetime of an object and ensure that it is properly cleaned up when it is no longer needed.
Signal/slots and function pointers are both mechanisms for connecting functions or methods to events. However, there are some key differences between the two. Signal/slots are a Qt-specific mechanism that allows objects to communicate with each other in a loosely coupled way. Signals are emitted by an object when a particular event occurs, and slots are functions that are connected to those signals and are executed when the signal is emitted. Function pointers, on the other hand, are a more general mechanism for connecting functions to events. They are typically used in C or C++ code to handle events in a low-level way.
