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  1. #include <iostream>
  2.  
  3. template <class ParticularFruit>
  4. struct FruitBase
  5. {
  6.     FruitBase(int num) : m_inventory(num) {}
  7.  
  8. 	float netProfit() const
  9. 	{
  10. 		auto && particular_fruit = static_cast<const ParticularFruit &>(*this);
  11. 		return particular_fruit.totalSellPrice() - particular_fruit.totalCostPrice();
  12. 	}
  13.  
  14. protected:
  15. 	int m_inventory;
  16. };
  17.  
  18. struct Apple : FruitBase<Apple>
  19. {
  20. 	Apple(int num, float unitCostPrice, float unitSellPrice) : 
  21. 		FruitBase(num),
  22. 		m_unitCostPrice(unitCostPrice),
  23. 		m_unitSellPrice(unitSellPrice) {}
  24.  
  25. 	float totalCostPrice() const { return m_inventory * m_unitCostPrice; }
  26. 	float totalSellPrice() const { return m_inventory * m_unitSellPrice; }
  27.  
  28. private:
  29. 	float m_unitCostPrice;
  30. 	float m_unitSellPrice;
  31. };
  32.  
  33. struct Orange : FruitBase<Orange>
  34. {
  35. 	Orange(int num, float unitCostPrice, float unitSellPrice) : 
  36. 		FruitBase(num),
  37. 		m_unitCostPrice(unitCostPrice),
  38. 		m_unitSellPrice(unitSellPrice) {}
  39.  
  40. 	float totalCostPrice() const { return m_inventory * m_unitCostPrice; }
  41. 	float totalSellPrice() const { return m_inventory * m_unitSellPrice; }
  42.  
  43. private:
  44. 	float m_unitCostPrice;
  45. 	float m_unitSellPrice;
  46. };
  47.  
  48. template <typename Fruit>
  49. void print_net_profit(const Fruit & fruit)
  50. {
  51. 	std::cout << "Net profit at current prices = $ " << fruit.netProfit() << std::endl;
  52. }
  53.  
  54. int main()
  55. {
  56. 	Apple apple(100, 4.00, 4.25);
  57. 	Orange orange(50, 7.00, 7.25);
  58.  
  59. 	print_net_profit(apple);
  60. 	print_net_profit(orange);
  61. }
  62.  
Success #stdin #stdout 0s 2884KB
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Net profit at current prices = $ 25
Net profit at current prices = $ 12.5
https://ideone.com/BiVB56
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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