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  1. #include <iostream>
  2. #include <string>
  3.  
  4. template <typename T>
  5. class Iterator {
  6. public:
  7.   virtual ~Iterator(){};
  8.   virtual bool hasNext() = 0;
  9.   virtual T *next() = 0;
  10. };
  11.  
  12. template <typename T>
  13. class Aggregate {
  14. public:
  15.   virtual ~Aggregate(){};
  16.   virtual Iterator<T> *iterator() = 0;
  17. };
  18.  
  19. class Book {
  20. private:
  21.   std::string name;
  22. public:
  23.   Book(){};
  24.   Book(std::string name);
  25.   ~Book(){};
  26.   std::string getName();
  27.   friend std::ostream &operator<<(std::ostream &s, Book *b);
  28. };
  29.  
  30. template <typename T>
  31. class TShelf : Aggregate<T> {
  32. private:
  33.   T **t_s;
  34.   int maxsize;
  35.   int last;
  36. public:
  37.   TShelf<T>(int maxsize);
  38.   ~TShelf(); /* ----------------here---------------- */
  39.   T *getAt(int index);
  40.   void append(T *book);
  41.   int getLength();
  42.   Iterator<T> *iterator();
  43. };
  44.  
  45. template <typename T>
  46. class TShelfIterator : public Iterator<T> {
  47. private:
  48.   TShelf<T> *tShelf;
  49.   int index;
  50. public:
  51.   TShelfIterator<T>(TShelf<T> *t_shelf);
  52.   ~TShelfIterator(){}; /* ----------------here---------------- */
  53.   bool hasNext();
  54.   T *next();
  55. };
  56.  
  57. Book::Book(std::string name) { this->name = name; }
  58. std::string Book::getName() {return this->name; }
  59. std::ostream &operator<<(std::ostream &s, Book *b) {
  60.   s << b->name;
  61.   return s;
  62. }
  63.  
  64. template <typename T> TShelf<T>::TShelf(int maxsize) {
  65.   this->t_s = new T* [maxsize];
  66.   this->maxsize = maxsize;
  67.   this->last = 0;
  68. }
  69. template <typename T> TShelf<T>::~TShelf() { delete [] (this->t_s); } /* ----------------here---------------- */
  70. template <typename T> T *TShelf<T>::getAt(int index) { return this->t_s[index]; }
  71. template <typename T> void TShelf<T>::append(T *t) {
  72.   if (last < maxsize) {
  73.     this->t_s[last] = t;
  74.     this->last++;
  75.   }
  76. }
  77. template <typename T> int TShelf<T>::getLength() { return this->last; }
  78. template <typename T> Iterator<T> *TShelf<T>::iterator() { return new TShelfIterator<T>(this); }
  79.  
  80.  
  81. template <typename T> TShelfIterator<T>::TShelfIterator(TShelf<T> *tShelf) {
  82.   this->tShelf = tShelf;
  83.   this->index = 0;
  84. }
  85. template <typename T> bool TShelfIterator<T>::hasNext() {
  86.   if (this->index < this->tShelf->getLength()) return true;
  87.   else return false;
  88. }
  89. template <typename T> T *TShelfIterator<T>::next() {
  90.   T *t = this->tShelf->getAt(index);
  91.   index++;
  92.   return t;
  93. }
  94.  
  95. int main() {
  96.   TShelf<Book> *tShelf = new TShelf<Book>(4);
  97.   tShelf->append(new Book("A"));
  98.   tShelf->append(new Book("BB"));
  99.   tShelf->append(new Book("CCC"));
  100.   tShelf->append(new Book("DDDD"));
  101.   Iterator<Book> *it = tShelf->iterator();
  102.   while (it->hasNext()) {
  103.     Book *book = it->next();
  104.     std::cout << book << std::endl;
  105.   }
  106.   delete it;
  107.   delete tShelf;
  108.   return 0;
  109. }
  110. /* end */
  111.  
Success #stdin #stdout 0s 15232KB
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Standard input is empty
stdout
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A
BB
CCC
DDDD
https://ideone.com/FUJ3OO
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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