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  1. #include <iostream>
  2. #include <vector>
  3. #include <memory>
  4. using namespace std;
  5.  
  6. using ElementTypes = int;
  7. const int DOT=1;
  8.  
  9. class Element {
  10. public:
  11.     ElementTypes type = DOT;
  12.  
  13.     Element() {}
  14.     Element(ElementTypes type) : type(type) {}
  15.  
  16.     virtual void Draw() { }
  17. };
  18. class Dot : public Element {
  19. public:
  20.     int x, y;
  21.  
  22.     Dot(int x, int y) : x(x), y(y) {}
  23.  
  24.     void Draw() override {
  25.         cout<<"DrawCircle("<<x<<","<< y<<", 2.f, BLACK);"<<endl; 
  26.     }
  27.     ~Dot() { x=-1; y=-1; cout<<"Destroyed"<<endl; } //just to demonstrate before and after destruction
  28. };
  29. class Drawing {
  30. public:
  31.     std::vector<shared_ptr<Element>> Elements;
  32.  
  33.     void AddDot(shared_ptr<Element> dot) {
  34.         Elements.emplace_back(dot);
  35.     }
  36.  
  37.     void Draw() { 
  38.         for (auto element : Elements) {
  39.             element->Draw();
  40.         }
  41.     }
  42. };
  43. void init (Drawing&d) {
  44. 	auto dt1 = make_shared<Dot>(10,30); 
  45. 	d.AddDot(dt1);
  46. }
  47. int main() {
  48. 	Drawing d; 
  49. 	init (d);
  50. 	d.Draw(); 
  51. }
Success #stdin #stdout 0.01s 5524KB
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DrawCircle(10,30, 2.f, BLACK);
Destroyed
https://ideone.com/K8xpij
language:
C++14 (gcc 8.3)
created:
3 years ago
visibility:
secret

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