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  1. #include <iostream>
  2. #include <memory>
  3.  
  4. using namespace std;
  5.  
  6. class Animal
  7. {
  8. public:
  9. 	using Pointer = unique_ptr<Animal>;
  10.  
  11. public:
  12. 	struct Point{ Point(double x, double y) : mX{x}, mY{y}{} double mX, mY; };
  13.  
  14. public:
  15. 	Animal(char id, Point position) : mId{id}, mPosition{position}{}
  16.  
  17. 	~Animal()
  18. 	{
  19. 		destroy();
  20. 	}
  21.  
  22. 	void attackEnemy(const Point* enemyPosition)
  23. 	{
  24. 		mEnemyPosition = enemyPosition;
  25. 	}
  26.  
  27. 	void destroy()
  28. 	{
  29. 		cout << mId << " is destroyed!" << endl;
  30. 	}
  31.  
  32. 	const Point* getPosition() const
  33. 	{
  34. 		return &mPosition;
  35. 	}
  36.  
  37. 	void whatAttack() const
  38. 	{
  39. 		cout << mId << " attack: " << (mEnemyPosition ? (to_string(mEnemyPosition->mX) + ' ' + to_string(mEnemyPosition->mY)) : "nothing") << endl;
  40. 	}
  41.  
  42. private:
  43. 	char mId;
  44. 	Point mPosition;
  45. 	const Point* mEnemyPosition{nullptr};
  46. };
  47.  
  48. int main()
  49. {
  50. 	Animal::Pointer a{new Animal{'A', {0, 0}}};
  51. 	Animal::Pointer b{new Animal{'B', {0, 0}}};
  52.  
  53. 	a->whatAttack();
  54. 	b->whatAttack();
  55.  
  56. 	{
  57. 		Animal::Pointer c{new Animal{'C', {5, 5}}};
  58.  
  59. 		a->attackEnemy(c->getPosition());
  60. 		b->attackEnemy(c->getPosition());
  61. 		a->whatAttack();
  62. 		b->whatAttack();
  63.  
  64. 		// C w miedzyczasie ginie z niewiadomych powodów
  65. 	}
  66.  
  67. 	a->whatAttack(); // ?
  68. 	b->whatAttack(); // ?
  69. }
Success #stdin #stdout 0s 3232KB
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stdin
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Standard input is empty
stdout
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A attack: nothing
B attack: nothing
A attack: 5.000000 5.000000
B attack: 5.000000 5.000000
C is destroyed!
A attack: 0.000000 5.000000
B attack: 0.000000 0.000000
B is destroyed!
A is destroyed!
https://ideone.com/Bu2L2g
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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