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  1. #include <iostream>
  2. #include <memory>
  3. #include <vector>
  4. #include <algorithm>
  5.  
  6. using namespace std;
  7.  
  8. class Animal
  9. {
  10. public:
  11. 	using Pointer = unique_ptr<Animal>;
  12.  
  13. public:
  14. 	struct Point{ Point(double x, double y) : mX{x}, mY{y}{} double mX, mY; };
  15.  
  16. public:
  17. 	Animal(char id, Point position) : mId{id}, mPosition{position}{}
  18.  
  19. 	~Animal()
  20. 	{
  21. 		destroy();
  22. 	}
  23.  
  24. 	void attackEnemy(Animal* enemy)
  25. 	{
  26. 		mEnemyTarget = enemy;
  27. 		enemy->addEnemyAttacker(this);
  28. 	}
  29.  
  30. 	void destroy()
  31. 	{
  32. 		cout << mId << " is destroyed!" << endl;
  33. 		if(mEnemyTarget) mEnemyTarget->notifyEnemyAttackerIsDown(this);
  34. 		for_each(mEnemyAttackers.begin(), mEnemyAttackers.end(), mem_fn(&Animal::notifyEnemyTargetIsDown));
  35. 	}
  36.  
  37. 	char getId() const
  38. 	{
  39. 		return mId;
  40. 	}
  41.  
  42. 	const Point* getPosition() const
  43. 	{
  44. 		return &mPosition;
  45. 	}
  46.  
  47. 	void whatAttack() const
  48. 	{
  49. 		cout << mId << " attack: " << (mEnemyTarget ? (mEnemyTarget->getId() + string(" ") + to_string(mEnemyTarget->getPosition()->mX) + ' ' + to_string(mEnemyTarget->getPosition()->mY)) : "nothing") << endl;
  50. 	}
  51.  
  52. private:
  53. 	void addEnemyAttacker(Animal* enemyAttacker)
  54. 	{
  55. 		mEnemyAttackers.push_back(enemyAttacker);
  56. 	}
  57.  
  58. 	void notifyEnemyAttackerIsDown(Animal* enemyAttacker)
  59. 	{
  60. 		mEnemyAttackers.erase(remove_if(mEnemyAttackers.begin(), mEnemyAttackers.end(), [enemyAttacker](Animal* attacker) { return attacker == enemyAttacker; }), mEnemyAttackers.end());
  61. 	}
  62.  
  63. 	void notifyEnemyTargetIsDown()
  64. 	{
  65. 		mEnemyTarget = nullptr;
  66. 	}
  67.  
  68. private:
  69. 	char mId;
  70. 	Point mPosition;
  71. 	Animal* mEnemyTarget{nullptr};
  72. 	vector<Animal*> mEnemyAttackers;
  73. };
  74.  
  75. int main()
  76. {
  77. 	Animal::Pointer a{new Animal{'A', {0, 0}}};
  78. 	Animal::Pointer b{new Animal{'B', {0, 0}}};
  79.  
  80. 	a->whatAttack();
  81. 	b->whatAttack();
  82.  
  83. 	{
  84. 		Animal::Pointer c{new Animal{'C', {5, 5}}};
  85.  
  86. 		a->attackEnemy(c.get());
  87. 		b->attackEnemy(c.get());
  88. 		a->whatAttack();
  89. 		b->whatAttack();
  90.  
  91. 		// C w miedzyczasie ginie z niewiadomych powodów
  92. 	}
  93.  
  94. 	a->whatAttack(); // ok
  95. 	b->whatAttack(); // ok
  96. }
  97.  
Success #stdin #stdout 0s 3232KB
comments (?)
stdin
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Standard input is empty
stdout
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A attack: nothing
B attack: nothing
A attack: C 5.000000 5.000000
B attack: C 5.000000 5.000000
C is destroyed!
A attack: nothing
B attack: nothing
B is destroyed!
A is destroyed!
https://ideone.com/zwhF4K
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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