Initial asio checkin.

[SVN r34306]

example/tutorial/timer3/timer.cpp

@@ -0,0 +1,34 @@
+#include <iostream>
+#include <boost/asio.hpp>
+#include <boost/bind.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+void print(const boost::asio::error& /*e*/,
+    boost::asio::deadline_timer* t, int* count)
+{
+  if (*count < 5)
+  {
+    std::cout << *count << "\n";
+    ++(*count);
+
+    t->expires_at(t->expires_at() + boost::posix_time::seconds(1));
+    t->async_wait(boost::bind(print,
+          boost::asio::placeholders::error, t, count));
+  }
+}
+
+int main()
+{
+  boost::asio::io_service io;
+
+  int count = 0;
+  boost::asio::deadline_timer t(io, boost::posix_time::seconds(1));
+  t.async_wait(boost::bind(print,
+        boost::asio::placeholders::error, &t, &count));
+
+  io.run();
+
+  std::cout << "Final count is " << count << "\n";
+
+  return 0;
+}