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  1. #include <list>
  2. #include <memory>
  3. #include <functional>
  4. #include <iostream>
  5.  
  6. template<typename TObject, typename... CtorArgs>
  7. class GenericPool {
  8. public:
  9. 	typedef std::shared_ptr<TObject> TObjectPtr;
  10.  
  11. 	explicit GenericPool(CtorArgs... args)
  12. 	{
  13. 		m_creator = [=]() { return std::make_shared<TObject>(args...); };
  14. 	}
  15.  
  16. 	~GenericPool()
  17. 	{
  18. 	}
  19.  
  20. 	TObjectPtr getObject()
  21. 	{
  22. 		if (!m_availables.empty()) {
  23. 			auto pooled = m_availables.front();
  24. 			m_availables.pop_front();
  25. 			return pooled;
  26. 		}
  27.  
  28. 		m_availables.push_back(m_creator());
  29. 		return m_availables.back();
  30. 	}
  31.  
  32. 	void release(TObjectPtr &objPtr)
  33. 	{
  34. 		m_availables.push_back(objPtr);
  35. 		m_inUse.remove(objPtr);
  36. 		objPtr.reset();
  37. 	}
  38.  
  39. private:
  40. 	std::function<TObjectPtr()> m_creator;
  41.  
  42. 	std::list<TObjectPtr> m_availables;
  43. 	std::list<TObjectPtr> m_inUse;
  44. };
  45.  
  46. struct YobaBase {
  47. 	YobaBase(int num, char sym) : m_num(num), m_sym(sym) {}
  48. 	virtual ~YobaBase() {}
  49.  
  50. 	int m_num;
  51. 	char m_sym;
  52. };
  53.  
  54. struct YobaDerived : YobaBase {
  55. 	YobaDerived(int num, char sym, float fnum) : YobaBase(num, sym), m_fnum(fnum) {}
  56.  
  57. 	float m_fnum;
  58. };
  59.  
  60. int main()
  61. {
  62. 	typedef GenericPool<YobaBase, int, char> YobaBasePool;
  63. 	typedef GenericPool<YobaDerived, int, char, float> YobaDerivedPool;
  64.  
  65. 	YobaBasePool ybPool(0, 'a');
  66. 	YobaDerivedPool ydPool(5, 'b', 0.0f);
  67.  
  68. 	auto yb = ybPool.getObject();
  69. 	auto yd = ydPool.getObject();
  70.  
  71. 	std::cout << "Yoba base (num = " << yb->m_num << ", sym = " << yb->m_sym << ")" << std::endl;
  72. 	std::cout << "Yoba derived (num = " << yd->m_num << ", sym = " 
  73. 			  << yd->m_sym << ", fnum = " << yd->m_fnum << ")" << std::endl;
  74.  
  75. 	ybPool.release(yb);
  76. 	ydPool.release(yd);
  77.  
  78. 	return 0;
  79. }
Success #stdin #stdout 0s 3236KB
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Yoba base (num = 0, sym = a)
Yoba derived (num = 5, sym = b, fnum = 0)
https://ideone.com/TC7GJt
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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