add boost::asio timer example/test code

c-cpp/boost_test.cc

@@ -0,0 +1,55 @@
+/* boost_test.cc: example boost::asio timer code.
+ *
+ * Mac OS X (boost installed in MacPorts)
+ *    g++ -o bt -I/opt/local/include boost_test.cc -L/opt/local/lib -lboost_system-mt
+ *
+ * Most other Systems:
+ *    g++ -o bt boost_test.cc -lboost_system-mt
+ */
+#include <iostream>
+#include <boost/asio.hpp>
+#include <boost/bind.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+
+
+/* handler object */
+class printer
+{
+public:
+  printer(boost::asio::io_service &io):
+    timer_(io, boost::posix_time::seconds(2)),
+    count_(0)
+  {
+    timer_.async_wait(boost::bind(&printer::print, this));
+  }
+
+  ~printer()
+  {
+    std::cout << "Final Count: " << count_ << ".\n";
+  }
+
+  void print()
+  {
+    if (count_ < 5) {
+      std::cout << "running: " << count_++ << ".\n";
+
+      timer_.expires_at(timer_.expires_at() + boost::posix_time::seconds(2));
+      timer_.async_wait(boost::bind(&printer::print, this));
+    }
+  }
+
+private:
+  boost::asio::deadline_timer timer_;
+  int count_;
+};
+
+
+int main (int argc, char const **argv)
+{
+  boost::asio::io_service ios;
+  printer p(ios);
+
+  ios.run();
+
+  return 0;
+}