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  1. #include <iostream>
  2. #include <memory>
  3. #include <utility>
  4. #include <vector>
  5.  
  6. struct Shape
  7. {
  8.     virtual void draw() = 0;
  9. };
  10.  
  11. template<typename T>
  12. struct ShapeAdapter:
  13.     Shape
  14. {
  15. 	template<typename... Args>
  16.     ShapeAdapter(Args&&... args):
  17.         data(std::forward<Args>(args)...)
  18.     {}
  19.  
  20.     virtual void draw() override
  21.     {
  22.         data.draw();
  23.     }
  24.  
  25.     T data;
  26. };
  27.  
  28. struct ShapeCollection
  29. {
  30.     template<typename T, typename... Args>
  31.     void add(Args&&... args)
  32.     {
  33.         auto ptr = new ShapeAdapter<T>{ std::forward<Args>(args)... };
  34.         shapes.emplace_back(ptr);
  35.     }
  36.  
  37.     void draw()
  38.     {
  39.     	for (auto&& shape: shapes)
  40.     	{
  41.     		shape->draw();
  42.     	}
  43.     }
  44.  
  45.     std::vector<std::unique_ptr<Shape>> shapes;  
  46. };
  47.  
  48.  
  49. struct Circle
  50. {
  51. 	Circle(int x, int y, int radius) {}
  52.  
  53. 	void draw()
  54. 	{
  55. 		std::cout << "draw circle\n";
  56. 	}
  57. };
  58.  
  59. struct Square
  60. {
  61. 	Square(int x, int y, int height, int length) {}
  62.  
  63. 	void draw()
  64. 	{
  65. 		std::cout << "draw square\n";
  66. 	}
  67. };
  68.  
  69.  
  70. int main()
  71. {
  72. 	ShapeCollection collection;
  73.  
  74. 	collection.add<Circle>(2, 3, 5);
  75. 	collection.add<Square>(1, 2, 8, 9);
  76.  
  77. 	collection.draw(); 
  78. }
  79.  
Success #stdin #stdout 0s 3432KB
comments (?)
stdin 
Standard input is empty
stdout 
draw circle
draw square
https://ideone.com/OXIg3k
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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