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  1. #include <iostream>
  2. #include <vector>
  3. #include <typeinfo>
  4. using namespace std;
  5.  
  6. template <class T>
  7. void clearVec ( vector<T> vec)
  8. {
  9. 	//for(typename vector<T>::iterator it = vec.begin(); it != vec.end(); ) {
  10. 	//for_each(vec.begin(), vec.end(), delete) {
  11. 	//	delete *it;
  12. 		//vec.erase(it);
  13. 	//}
  14. 	//vec.clear();
  15. }
  16.  
  17. class A
  18. {
  19. public:
  20. 	A()
  21. 	{
  22. 		cout << "Constructor A\n";	
  23. 	}
  24. 	virtual ~A()
  25. 	{
  26. 		cout << "Destructor A\n";
  27. 	}
  28. 	virtual void update()
  29. 	{
  30. 		func ();
  31. 		func2 ();
  32. 	}
  33.  
  34. 	virtual void func()
  35. 	{
  36. 		cout << "func A\n";
  37. 		func2();
  38. 	}
  39.  
  40. 	virtual void func2()
  41. 	{
  42. 		cout << "func2 A\n";
  43. 	}
  44. 	virtual double foo(unsigned a) const
  45. 	{
  46.  
  47. 	  return 2.5;
  48. 	}
  49. };
  50.  
  51. class B: public A
  52. {
  53. public:
  54. 	B():A()
  55. 	{
  56. 		cout << "Constructor B\n";	
  57. 	}
  58. 	virtual ~B()
  59. 	{
  60. 		cout << "Destructor B\n";	
  61. 	}
  62. 	//virtual void func() 
  63. 	//{
  64. 	//	A::func();
  65. //		cout << "func B\n";
  66. 	//}
  67.  
  68. 	void func2()
  69. 	{
  70. 		cout << "func2 B\n";
  71. 	}
  72. };
  73.  
  74. typedef double (A::*Method)(unsigned) const;
  75.  
  76. void test(A* a, Method mtd){
  77. unsigned b = 5;
  78.   cout << "test met " << (a->*mtd)(b) << endl;
  79. }
  80.  
  81. template<class T>
  82. bool isSameObject(T const * p, T const * q)
  83. {
  84.  //T* a = const_cast<T*>(p);
  85.  //T* b = const_cast<T*>(q);
  86.  //return dynamic_cast<T*>(a) == dynamic_cast<T*>(b);
  87.  
  88.  //return dynamic_cast<const T*>(p) == dynamic_cast<const T*>(q); 
  89.  return dynamic_cast<T const*>(p) == dynamic_cast<T const*>(q);
  90. }
  91.  
  92. int main() {
  93. 	// your code goes here
  94. 	//B* b = new B();
  95. 	//A* a = new B();
  96. 	//b->update();
  97. 	//a->update();
  98. 	//delete a;
  99. 	//delete b;
  100. 	//vector<A*> v;
  101. 	//v.push_back(new B());
  102. 	//v.push_back(new A());
  103.  
  104. 	//for(vector<A*>::iterator it = v.begin(); it != v.end(); ++it ) {
  105. 	//for(size_t it = 0; it < v.size(); ++it ) {
  106. 		//A* a = v[it];
  107. 	//	A* a = *it;
  108. 		//delete a;	
  109. 	//}
  110. 	//clearVec(v);
  111. 	//v.clear();
  112. 	A* a = new A();
  113. 	A* b = new B();
  114. 	b->func();
  115.  
  116. 	cout << b << endl;
  117. 	//cout << typeid(*(dynamic_cast<void*>(b))).name();
  118.  
  119. 	cout << isSameObject(b, b);
  120.  
  121.  
  122. 	test(a, &A::foo);
  123. 	return 0;
  124. }
Success #stdin #stdout 0.01s 5284KB
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Standard input is empty
stdout
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Constructor A
Constructor A
Constructor B
func A
func2 B
0x55afa723eea0
1test met 2.5
https://ideone.com/d7X65Q
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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