Full merge from trunk at revision 41356 of entire boost-root tree.

[SVN r41370]

example/tutorial/timer4/timer.cpp

@@ -0,0 +1,55 @@
+//
+// timer.cpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2007 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#include <iostream>
+#include <boost/asio.hpp>
+#include <boost/bind.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+class printer
+{
+public:
+  printer(boost::asio::io_service& io)
+    : timer_(io, boost::posix_time::seconds(1)),
+      count_(0)
+  {
+    timer_.async_wait(boost::bind(&printer::print, this));
+  }
+
+  ~printer()
+  {
+    std::cout << "Final count is " << count_ << "\n";
+  }
+
+  void print()
+  {
+    if (count_ < 5)
+    {
+      std::cout << count_ << "\n";
+      ++count_;
+
+      timer_.expires_at(timer_.expires_at() + boost::posix_time::seconds(1));
+      timer_.async_wait(boost::bind(&printer::print, this));
+    }
+  }
+
+private:
+  boost::asio::deadline_timer timer_;
+  int count_;
+};
+
+int main()
+{
+  boost::asio::io_service io;
+  printer p(io);
+  io.run();
+
+  return 0;
+}