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  1. #include <iostream>
  2. #include <unordered_map>
  3. #include <string>
  4.  
  5. namespace ComponentTypes
  6. {
  7. 	const std::string PlayerComponent = "PlayerComponent";
  8. 	const std::string GameObjectComponent = "GameObjectComponent"; 
  9. }
  10.  
  11. class Component
  12. {
  13. public:
  14. 	virtual Component* Clone() const = 0;
  15. 	virtual std::string ComponentType() const = 0;
  16. };
  17.  
  18. class Player : public Component
  19. {
  20. public:
  21. 	Component* Clone() const
  22. 	{
  23. 		return new Player(*this);
  24. 	}
  25.  
  26.  	std::string ComponentType() const
  27. 	{
  28. 		return ComponentTypes::PlayerComponent;
  29. 	}
  30. };
  31.  
  32. class GameObject : public Component
  33. {
  34. public:
  35. 	Component* Clone() const
  36. 	{
  37. 		return new GameObject(*this);
  38. 	}
  39.  
  40. 	std::string ComponentType() const
  41. 	{
  42. 		return ComponentTypes::GameObjectComponent;
  43. 	}
  44. };
  45.  
  46. class SomeContainer
  47. {
  48. private:
  49. 	std::unordered_map<std::string, Component*> m_components;
  50.  
  51. 	bool HasComponent(const std::string& componentType) const
  52. 	{
  53. 		return m_components.find(componentType) != m_components.end();
  54. 	}
  55.  
  56. public:	
  57. 	void AddComponent(Component* theComponent)
  58. 	{
  59. 		if (!HasComponent(theComponent->ComponentType()))
  60. 		{
  61. 			m_components.insert(std::make_pair(theComponent->ComponentType(), theComponent));
  62. 		}
  63. 		else
  64. 		{
  65. 			std::cout << "I didn't add this " << theComponent->ComponentType();
  66. 			std::cout << " as I already have one" << std::endl;
  67. 		}
  68. 	}
  69.  
  70. 	Component* GetComponent(const std::string& componentType) const
  71. 	{
  72. 		return HasComponent(componentType) ? m_components.at(componentType) 
  73. 										   : nullptr;
  74. 	}
  75. };
  76.  
  77. int main() 
  78. {
  79. 	auto someContainer = SomeContainer();
  80.  
  81. 	someContainer.AddComponent(new Player());
  82. 	someContainer.AddComponent(new GameObject());
  83.  
  84. 	auto retrievedPlayer = someContainer.GetComponent(ComponentTypes::PlayerComponent);
  85. 	std::cout << "Got component: " << retrievedPlayer->ComponentType() << std::endl;
  86.  
  87. 	auto retrievedGameObject = someContainer.GetComponent(ComponentTypes::GameObjectComponent);
  88. 	std::cout << "Got component: " << retrievedGameObject->ComponentType() << std::endl;
  89. 	return 0;
  90. }
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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Got component: PlayerComponent
Got component: GameObjectComponent
https://ideone.com/5y5s8p
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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