ceph/src/boost/libs/intrusive/example/doc_window.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 //
   3 // (C) Copyright Ion Gaztanaga  2006-2013
   4 //
   5 // Distributed under the Boost Software License, Version 1.0.
   6 //    (See accompanying file LICENSE_1_0.txt or copy at
   7 //          http://www.boost.org/LICENSE_1_0.txt)
   8 //
   9 // See http://www.boost.org/libs/intrusive for documentation.
  10 //
  11 /////////////////////////////////////////////////////////////////////////////
  12 //[doc_window_code
  13 #include <boost/intrusive/list.hpp>
  14
  15 using namespace boost::intrusive;
  16
  17 //An abstract class that can be inserted in an intrusive list
  18 class Window : public list_base_hook<>
  19 {
  20    public:
  21    //This is a container those value is an abstract class: you can't do this with std::list.
  22    typedef list<Window> win_list;
  23
  24    //A static intrusive list declaration
  25    static win_list all_windows;
  26
  27    //Constructor. Includes this window in the list
  28    Window()             {  all_windows.push_back(*this);  }
  29    //Destructor. Removes this node from the list
  30    virtual ~Window()    {  all_windows.erase(win_list::s_iterator_to(*this));  }
  31    //Pure virtual function to be implemented by derived classes
  32    virtual void Paint() = 0;
  33 };
  34
  35 //The static intrusive list declaration
  36 Window::win_list Window::all_windows;
  37
  38 //Some Window derived classes
  39 class FrameWindow :  public Window
  40 {  virtual void Paint() BOOST_OVERRIDE {/**/} };
  41
  42 class EditWindow :  public Window
  43 {  virtual void Paint() BOOST_OVERRIDE {/**/} };
  44
  45 class CanvasWindow :  public Window
  46 {  virtual void Paint() BOOST_OVERRIDE {/**/} };
  47
  48 //A function that prints all windows stored in the intrusive list
  49 void paint_all_windows()
  50 {
  51    for(Window::win_list::iterator i(Window::all_windows.begin())
  52                                 , e(Window::all_windows.end())
  53       ; i != e; ++i)
  54       i->Paint();
  55 }
  56
  57 //...
  58
  59 //A class derived from Window
  60 class MainWindow  :  public Window
  61 {
  62    FrameWindow   frame_;  //these are derived from Window too
  63    EditWindow    edit_;
  64    CanvasWindow  canvas_;
  65
  66    public:
  67    void Paint() BOOST_OVERRIDE {/**/}
  68    //...
  69 };
  70
  71 //Main function
  72 int main()
  73 {
  74    //When a Window class is created, is automatically registered in the global list
  75    MainWindow window;
  76
  77    //Paint all the windows, sub-windows and so on
  78    paint_all_windows();
  79
  80    //All the windows are automatically unregistered in their destructors.
  81    return 0;
  82 }
  83 //]