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  1. #include <vector>
  2. #include <iostream>
  3.  
  4. using namespace std;
  5.  
  6. class Base
  7. {
  8. public:
  9.     virtual void sayHello()
  10.     {
  11.     	cout << "Hello from Base\n";
  12.     }
  13. };
  14.  
  15. class Derived1 : public Base
  16. {
  17. public:
  18.     virtual void sayHello()
  19.     {
  20.     	cout << "Hello from Derived1\n";
  21.     }
  22. };
  23.  
  24. class Derived2 : public Base
  25. {
  26. public:
  27. 	virtual void sayHello()
  28. 	{
  29. 		cout << "Hello from Derived2\n";
  30. 	}
  31. };
  32.  
  33. vector<Base*> elements;
  34.  
  35. template <class T>
  36. void deleteByType()
  37. {
  38. 	for (int i = 0; i < elements.size(); i++)
  39. 	{
  40. 		T* a = dynamic_cast<T*>(elements[i]);
  41. 		if (a != nullptr)
  42. 		{
  43. 			delete a;
  44. 			elements.erase(elements.begin() + i);
  45. 			cout << i << "th element deleted\n";
  46. 			i--;
  47. 		}
  48. 	}
  49. }
  50.  
  51. int main()
  52. {
  53. 	elements.push_back(new Derived1);
  54. 	elements.push_back(new Derived2);
  55. 	elements.push_back(new Derived2);
  56. 	elements.push_back(new Derived1);
  57.  
  58. 	for (Base* element : elements)
  59. 	{
  60. 		element->sayHello();
  61. 	}
  62.  
  63. 	deleteByType<Derived1>();
  64.  
  65. 	for (Base* element : elements)
  66. 	{
  67. 		element->sayHello();
  68. 	}
  69.  
  70.  
  71. 	for (Base* element : elements)
  72. 	{
  73. 		delete element;
  74. 	}
  75. 	elements.clear();
  76. 	return 0;
  77. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
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Standard input is empty
stdout
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Hello from Derived1
Hello from Derived2
Hello from Derived2
Hello from Derived1
0th element deleted
2th element deleted
Hello from Derived2
Hello from Derived2
https://ideone.com/WvkXkw
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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