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  1. #include "browserhistory.h"
  2. #include <iostream>
  3. #include <string>
  4.  
  5.  
  6.  
  7. BrowserHistory::BrowserHistory(string default_url)
  8. {
  9.     head = new Node;
  10.     head->url = default_url;
  11.     head->next = nullptr;
  12.     head->prev = nullptr;
  13.     tail, current = head;
  14. }
  15. string BrowserHistory::current_url()
  16. {
  17.     return current->url;
  18. }
  19. void BrowserHistory::go_to_url(string url)
  20. {
  21.     Node* temp = new Node;
  22.     temp->prev = current;
  23.     temp->next = nullptr;
  24.     temp->url = url;
  25.     current->next = temp;
  26.     tail, current = temp;  
  27. }
  28. void BrowserHistory::back()
  29. {
  30.     if(current->prev != nullptr)
  31.         current = current->prev;
  32. }
  33. bool BrowserHistory::can_go_back()
  34. {
  35.     if (current->prev != nullptr)
  36.         return true;
  37.     else
  38.         return false;
  39. }
  40. int BrowserHistory::past_url_count()
  41. {
  42.     Node* temp;
  43.     temp = current;
  44.     int count = 0;
  45.     while (temp->prev != nullptr)
  46.     {
  47.         count += 1;
  48.         temp = temp->prev;
  49.     }
  50.     return count;
  51. }
  52. void BrowserHistory::forward()
  53. {
  54.     if (current->next != nullptr)
  55.         current = current->next;
  56. }
  57. bool BrowserHistory::can_go_forward()
  58. {
  59.     if (current->next != nullptr)
  60.         return true;
  61.     else
  62.         return false;
  63. }
  64. int BrowserHistory::future_url_count()
  65. {
  66.     Node* temp;
  67.     temp = current;
  68.     int count = 0;
  69.     while (temp->next != nullptr)
  70.     {
  71.         count += 1;
  72.         temp = temp->next;
  73.     }
  74.     return count;
  75. }
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