Qt signal is ten times slower than a virtual function

Qt signal is ten times slower than a virtual function signal and slot in qt 使用Qt的信号和槽（Signals and Slots）机制有以下好处：松耦合：通过信号和槽，对象之间的通信是松耦合的。发送者不需要知道接收者的具体实现细节， signal and slot arguments are not compatible All classes that inherit from QObject or one of its subclasses, like QWidget can contain signals and slots Signals are emitted by objects when they change

signal and slot arguments are not compatible component_A has an interface with A_slot() method; component_B has an interface with B_slot() and B_signal() methods Connecting slots is easy:

signal and slot qt QT library · Qt::DirectConnection Use a Property, Signal or Slot? · Slots allow communication from QML to C++: Slots are used to trigger C++ code from QML You can use parameters and return