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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. // Declarations
  5.  
  6. template <typename T>
  7. class List;
  8. template <typename T>
  9. class Stack;
  10. template <typename T>
  11. class Queue;
  12.  
  13. template <typename T>
  14. ostream& operator<<(ostream&, const List<T>&);
  15. template <typename T>
  16. ostream& operator<<(ostream&, const Stack<T>&);
  17. template <typename T>
  18. ostream& operator<<(ostream&, const Queue<T>&);
  19.  
  20. template <typename T>
  21. class Node{
  22.     private:
  23.         friend class List<T>;
  24.         friend class Stack<T>;
  25.         friend class Queue<T>;
  26. };
  27.  
  28. template <typename T>
  29. class List{
  30.     public:
  31.         friend ostream& operator<< <T>(ostream&, const List<T>&);
  32. };
  33.  
  34. template <typename T>
  35. class Stack{
  36.     public:
  37.         friend ostream& operator<< <T>(ostream&, const Stack<T>&);
  38. };
  39.  
  40. template <typename T>
  41. class Queue{
  42.     public:
  43.         friend ostream& operator<< <T>(ostream&, const Queue<T>&);
  44. };
  45.  
  46. // Definitions
  47.  
  48. template <typename T>
  49. ostream& operator<<(ostream& out, const List<T>& toPrint) {
  50.     out << "List";
  51.     return cout;
  52. }
  53.  
  54. template <typename T>
  55. ostream& operator<<(ostream& out, const Stack<T>& toPrint) {
  56.     out << "Stack";
  57.     return out;
  58. }
  59.  
  60. template <typename T>
  61. ostream& operator<<(ostream& out, const Queue<T>& toPrint) {
  62.     out << "Queue";
  63.     return out;
  64. }
  65.  
  66. // main
  67.  
  68. int main() {
  69. 	List<int>  list;
  70. 	Stack<int> stack;
  71. 	Queue<int> queue;
  72.  
  73. 	cout << list  << endl
  74. 	     << stack << endl
  75. 	     << queue << endl;
  76.  
  77. 	return 0;
  78. }
Success #stdin #stdout 0s 3296KB
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stdin
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Standard input is empty
stdout
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List
Stack
Queue
https://ideone.com/vrGndm
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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