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  1. #include <functional>
  2. #include <iostream>
  3. #include <array>
  4.  
  5. //We cannot touch this class
  6. class Button
  7. {
  8. public:
  9. 	virtual void onClick()
  10. 	{
  11.  
  12. 	}
  13. };
  14.  
  15. void click_button(Button& button)
  16. {
  17. 	button.onClick();
  18. }
  19.  
  20. class CustomButton: public Button
  21. {
  22. 	const std::function<void(void)> callback;
  23. public:
  24. 	CustomButton(std::function<void(void)> cb) : callback(std::move(cb)) {}
  25.  
  26. 	virtual void onClick() override
  27. 	{
  28. 		callback();
  29. 	}
  30. };
  31.  
  32. void meow() {std::cout << "meow";}
  33. void beep() {std::cout << "beep";}
  34. void clack() {std::cout << "clack";}
  35.  
  36. int main()
  37. {
  38. 	std::array<CustomButton, 3> buttons {{{meow}, {beep}, {clack}}};
  39. 	std::cout << "Which button do you want to press? (1-3)\n";
  40. 	int i;
  41. 	std::cin >> i;
  42. 	std::cout << "Button " << i << ' ';
  43. 	click_button(buttons[i-1]);
  44. 	std::cout << "'s\n";
  45. }
Success #stdin #stdout 0s 3464KB
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Which button do you want to press? (1-3)
Button 1 meow's
https://ideone.com/InrKwZ
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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