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  1. // based on ex7.32
  2. #include <string>
  3. #include <vector>
  4. #include <iostream>
  5.  
  6. template <std::string::size_type height, std::string::size_type width>
  7. class Screen;
  8.  
  9. class Window_mgr {
  10. public:
  11.   using FixedScreen = Screen<24, 80>;
  12.   using screen_index = std::vector<FixedScreen>::size_type;
  13.   void clear(screen_index);
  14.   Window_mgr();
  15.  
  16. private:
  17.   std::vector<FixedScreen> screens;
  18. };
  19.  
  20. // the Screen size is fixed at run time
  21. template <std::string::size_type height, std::string::size_type width>
  22. class Screen {
  23.   friend void Window_mgr::clear(screen_index);
  24.  
  25. public:
  26.   using size_type = std::string::size_type;
  27.   using content_type = char;
  28.  
  29.   explicit Screen(content_type c = ' ')
  30.       : cursor(0), contents(height * width, c) { }
  31.  
  32.   const content_type &get() const { return contents[cursor]; }
  33.   const content_type &get(size_type row, size_type col) const;
  34.  
  35.   Screen &set(content_type c);
  36.   Screen &set(size_type row, size_type col, content_type c);
  37.  
  38.   Screen &move(size_type row, size_type col);
  39.  
  40.   const Screen &display(std::ostream &os) const;
  41.   Screen &display(std::ostream &os);
  42.  
  43. private:
  44.   void do_display(std::ostream &os) const;
  45.  
  46.   size_type cursor = 0;
  47.   std::string contents;
  48. };
  49.  
  50. template <std::string::size_type height, std::string::size_type width>
  51. inline const typename Screen<height, width>::content_type &
  52. Screen<height, width>::get(size_type row, size_type col) const {
  53.   return contents[row * width + col];
  54. }
  55.  
  56. template <std::string::size_type height, std::string::size_type width>
  57. inline Screen<height, width> &Screen<height, width>::set(content_type c) {
  58.   contents[cursor] = c;
  59.   return *this;
  60. }
  61.  
  62. template <std::string::size_type height, std::string::size_type width>
  63. inline Screen<height, width> &
  64. Screen<height, width>::set(size_type row, size_type col, content_type c) {
  65.   contents[row * width + col] = c;
  66.   return *this;
  67. }
  68.  
  69. template <std::string::size_type height, std::string::size_type width>
  70. inline Screen<height, width> &
  71. Screen<height, width>::move(size_type row, size_type col) {
  72.   cursor = row * width + col;
  73.   return *this;
  74. }
  75.  
  76. template <std::string::size_type height, std::string::size_type width>
  77. inline const Screen<height, width> &
  78. Screen<height, width>::display(std::ostream &os) const {
  79.   do_display(os);
  80.   return *this;
  81. }
  82.  
  83. template <std::string::size_type height, std::string::size_type width>
  84. inline Screen<height, width> &
  85. Screen<height, width>::display(std::ostream &os) {
  86.   do_display(os);
  87.   return *this;
  88. }
  89.  
  90. template <std::string::size_type height, std::string::size_type width>
  91. inline void Screen<height, width>::do_display(std::ostream &os) const {
  92.   for (size_type i = 0; i != contents.size(); ++i) {
  93.     os << contents[i];
  94.     if ((i + 1) % width == 0 && i + 1 != contents.size())
  95.       os << "\n";
  96.   }
  97. }
  98.  
  99. Window_mgr::Window_mgr() : screens{FixedScreen()} {}
  100.  
  101. //void Window_mgr::clear(screen_index i) {
  102. //  FixedScreen &s = screens[i];
  103. //  s.contents = std::string(s.height * s.width, ' ');  // error in template
  104. //}
  105.  
  106. int main() {
  107.   Screen<5, 5> myScreen('X');
  108.   myScreen.display(std::cout);
  109.   std::cout << "\n-----\n";
  110.   myScreen.move(4,0).set('#').display(std::cout);
  111.   std::cout << "\n-----\n";
  112.   myScreen.display(std::cout);
  113.   std::cout << "\n-----\n";
  114.  
  115.   Screen<2, 3> myScreen2;
  116.   const Screen<2, 3> blank;
  117.   myScreen2.set('#').display(std::cout);  // calls nonconst version
  118.   std::cout << "\n-----\n";
  119.   blank.display(std::cout);  // calls const version
  120.   std::cout << "\n-----\n";
  121.  
  122.   Window_mgr window;
  123.   //window.clear(0);
  124.  
  125.   return 0;
  126. }
Success #stdin #stdout 0s 3460KB
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stdout 
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https://ideone.com/6N8z7w
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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