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  1. #include<iostream>
  2. #include<vector>
  3. #include<string>
  4. #include <algorithm>
  5.  
  6. class ISubscriber {
  7. public:
  8. 	virtual void update() = 0;
  9. };
  10.  
  11. class Publisher {
  12. 	std::vector<ISubscriber*> m_subscriberList;
  13. public:
  14. 	virtual void registerSubscriber(ISubscriber& subscriber) {
  15. 		m_subscriberList.push_back(&subscriber);
  16. 	}
  17.  
  18. 	virtual void unregisterSubscriber(ISubscriber& subscriber) {
  19. 		m_subscriberList.erase(std::remove(begin(m_subscriberList), end(m_subscriberList), &subscriber), end(m_subscriberList));
  20. 	}
  21.  
  22. 	virtual void notifySubscribers() {
  23. 		for (auto subscriber : m_subscriberList) {
  24. 			subscriber->update();
  25. 		}
  26. 	}
  27. };
  28.  
  29. class UpdateManager : public Publisher {
  30. 	int m_baudRate;
  31. 	int m_aspectRatio;
  32. 	int m_volumeLevel;
  33. public:
  34.  
  35. 	UpdateManager() : m_baudRate(0), m_aspectRatio(0), m_volumeLevel(0) {}
  36.  
  37. 	virtual void setBaudRate(int newBaudRate) { 
  38. 		m_baudRate = newBaudRate; 
  39. 		notifySubscribers();
  40. 	}
  41.  
  42. 	virtual void setAspectRatio(int newAspectRatio) {
  43. 		m_aspectRatio = newAspectRatio;
  44. 		notifySubscribers();
  45. 	}
  46.  
  47. 	virtual void setVolumeLevel(int newVolume) { 
  48. 		m_volumeLevel = newVolume; 
  49. 		notifySubscribers(); 
  50. 	}
  51.  
  52. 	int getBaudRate() const { return m_baudRate; }
  53. 	int getAspectRatio() const { return m_aspectRatio; }
  54. 	int getVolumeLevel() const { return m_volumeLevel; }
  55. };
  56.  
  57. class UpdateReceiver : public ISubscriber {
  58. 	UpdateManager& m_manager;
  59. public:
  60. 	UpdateReceiver(UpdateManager& manager) : m_manager(manager) {
  61. 		m_manager.registerSubscriber(*this);
  62. 	}
  63. 	virtual void update() {
  64. 		// Process the new values
  65. 		std::cout << m_manager.getBaudRate() << std::endl;
  66. 		std::cout << m_manager.getAspectRatio() << std::endl;
  67. 		std::cout << m_manager.getVolumeLevel() << std::endl;
  68. 	}
  69. };
  70.  
  71. int main() {
  72.  
  73. 	UpdateManager manager;
  74. 	UpdateReceiver receiver(manager);
  75. 	manager.setBaudRate(5);
  76. 	return 0;
  77. }
Success #stdin #stdout 0s 3432KB
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https://ideone.com/vKWx1Q
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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