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  1.  
  2. #include <vector>
  3. #include <list>
  4. #include <string>
  5.  
  6. template <class Type>
  7. class Base {
  8. protected:
  9.     std::string line;
  10. public:
  11.     Base();
  12.     //Type histories [2];
  13.     std::string DisplayHistory();
  14.     std::string DisplayRecent();
  15. };
  16.  
  17. class DerivedA : public Base<T> {
  18.     //error: 'T' was not declared in this scope
  19.     //error: template argument 1 is invalid
  20. protected:
  21.     std::string last;
  22.     std::string combined;
  23.     std::list<std::string> A;
  24. public:
  25.     DerivedA();
  26.     void Add(std::string line);
  27.     std::string DisplayHistory();
  28. };
  29.  
  30. class DerivedB : public Base<T> {
  31. protected:
  32.     std::string last;
  33.     std::string combined;
  34.     std::vector<std::string> B;
  35. public:
  36.     DerivedB();
  37.     void Add(std::string line);
  38.     std::string DisplayHistory();
  39. };
  40.  
  41.  
  42.  
  43. template <class T>
  44. Base<T>::Base()
  45. {
  46.     histories[0] = DerivedA();
  47.     histories[1] = DerivedB();
  48. }
  49.  
  50. template <class T>
  51. std::string Base<T>::DisplayHistory()
  52. {
  53.     return histories[0].DisplayHistory() + "\n" + histories[1].DisplayHistory();
  54. }
  55.  
  56. template <class T>
  57. std::string Base<T>::DisplayRecent()
  58. {
  59.     return last;
  60. }
  61.  
  62. DerivedA::DerivedA()
  63. {
  64.     combined = "List History:\n";
  65. }
  66.  
  67. void DerivedA::Add(std::string line)
  68. {
  69.     if (A.size() <= 50)
  70.     {
  71.         A.push_front(line);
  72.     }
  73.     else
  74.     {
  75.         A.pop_back();
  76.         A.push_front(line);
  77.     }
  78.     last = line;
  79. }
  80.  
  81. std::string DerivedA::DisplayHistory()
  82. {
  83.     for (int n = A.size(); n > 0; n--)
  84.     {
  85.         combined.append(A[n]);
  86.         combined.append("\n");
  87.     }
  88.     return combined;
  89. }
  90.  
  91. DerivedB::DerivedB()
  92. {
  93.     combined = "STD:Vector List History:\n"
  94. }
  95.  
  96. void DerivedB::Add(std::string line)
  97. {
  98.     if (B.size() <= 50)
  99.     {
  100.         B.push_front(line);
  101.     }
  102.     else
  103.     {
  104.         B.pop_back();
  105.         B.push_front(line);
  106.     }
  107.     last = line;
  108. }
  109.  
  110. std::string DerivedB::DisplayHistory()
  111. {
  112.     for (int n = B.size(); n > 0; n--)
  113.     {
  114.         combined.append(B[n]);
  115.         combined.append("\n");
  116.     }
  117.     return combined;
  118. }
  119.  
  120.  
  121.  
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https://ideone.com/H9NXdw
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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