C++ High Performance

Implementing a simple Button class with std::function

Let's put the std::function to use in something that resembles a real-world example. If we create a Button class, we can use the std::function to store the action corresponding to clicking the buttons, so that when we call the on_click() member function, the corresponding code is executed.

We can declare the Button class like this:

class Button { 
public: 
  Button(std::function<void(void)> click) : on_click_{click} {} 
  auto on_click() const { on_click_(); } 
private: 
  std::function<void(void)> on_click_{};
}; 

We can then use it to create a multitude of buttons with different actions. As each button still has the same type, they can also be stored in a container:

auto make_buttons() { auto beep_button ...