ceph/src/boost/libs/signals/example/doc_view.cpp

   1 // Document/View sample for Boost.Signals
   2 // Copyright Keith MacDonald 2005. Use, modification and
   3 // distribution is subject to the Boost Software License, Version
   4 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 // For more information, see http://www.boost.org
   7
   8 #include <iostream>
   9 #include <string>
  10 #include <boost/signal.hpp>
  11 #include <boost/bind.hpp>
  12
  13 class Document
  14 {
  15 public:
  16     typedef boost::signal<void (bool)>  signal_t;
  17     typedef boost::signals::connection  connection_t;
  18
  19 public:
  20     Document()
  21     {}
  22
  23     connection_t connect(signal_t::slot_function_type subscriber)
  24     {
  25         return m_sig.connect(subscriber);
  26     }
  27
  28     void disconnect(connection_t subscriber)
  29     {
  30         subscriber.disconnect();
  31     }
  32
  33     void append(const char* s)
  34     {
  35         m_text += s;
  36         m_sig(true);
  37     }
  38
  39     const std::string& getText() const
  40     {
  41         return m_text;
  42     }
  43
  44 private:
  45     signal_t    m_sig;
  46     std::string m_text;
  47 };
  48
  49 class View
  50 {
  51 public:
  52     View(Document& m)
  53         : m_document(m)
  54     {
  55         m_connection = m_document.connect(boost::bind(&View::refresh, this, _1));
  56     }
  57
  58     virtual ~View()
  59     {
  60         m_document.disconnect(m_connection);
  61     }
  62
  63     virtual void refresh(bool bExtended) const = 0;
  64
  65 protected:
  66     Document&               m_document;
  67
  68 private:
  69     Document::connection_t  m_connection;
  70 };
  71
  72 class TextView : public View
  73 {
  74 public:
  75     TextView(Document& doc)
  76         : View(doc)
  77     {}
  78
  79     virtual void refresh(bool bExtended) const
  80     {
  81         std::cout << "TextView: " << m_document.getText() << std::endl;
  82     }
  83 };
  84
  85 class HexView : public View
  86 {
  87 public:
  88     HexView(Document& doc)
  89         : View(doc)
  90     {}
  91
  92     virtual void refresh(bool bExtended) const
  93     {
  94         const std::string&  s = m_document.getText();
  95
  96         std::cout << "HexView:";
  97
  98         for (std::string::const_iterator it = s.begin(); it != s.end(); ++it)
  99             std::cout << ' ' << std::hex << static_cast<int>(*it);
 100
 101         std::cout << std::endl;
 102     }
 103 };
 104
 105 int main(int argc, char* argv[])
 106 {
 107     Document    doc;
 108     TextView    v1(doc);
 109     HexView     v2(doc);
 110
 111     doc.append(argc == 2 ? argv[1] : "Hello world!");
 112     return 0;
 113 }