ceph/src/boost/libs/signals2/example/extended_slot.cpp

   1 // Example program for connecting an extended slot,
   2 // using a signal's connect_extended and extended_slot_type.
   3 //
   4 // Copyright Frank Mori Hess 2009.
   5 //
   6 // Use, modification and
   7 // distribution is subject to the Boost Software License, Version
   8 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10 // For more information, see http://www.boost.org
  11
  12 #include <boost/signals2/signal.hpp>
  13 #include <iostream>
  14 #include <string>
  15
  16 namespace bs2 = boost::signals2;
  17
  18 void single_shot_slot(const bs2::connection &conn, const std::string &message)
  19 {
  20   conn.disconnect();
  21   std::cout << message;
  22 }
  23
  24 int main()
  25 {
  26   typedef bs2::signal<void (void)> sig_type;
  27   sig_type sig;
  28   {
  29     sig_type::extended_slot_type hello(&single_shot_slot, _1, "Hello");
  30     sig.connect_extended(hello);
  31   }
  32   sig();  // prints "Hello"
  33   {
  34     sig_type::extended_slot_type world(&single_shot_slot, _1, ", World!\n");
  35     sig.connect_extended(world);
  36   }
  37   sig();  // only prints ", World!\n" since hello slot has disconnected itself
  38   sig();  // prints nothing, world slot has disconnected itself
  39
  40   return 0;
  41 }
  42