ceph/src/boost/libs/msm/doc/PDF/examples/distributed_table/DistributedTable.cpp

   1 // Copyright 2010 Christophe Henry
   2 // henry UNDERSCORE christophe AT hotmail DOT com
   3 // This is an extended version of the state machine available in the boost::mpl library
   4 // Distributed under the same license as the original.
   5 // Copyright for the original version:
   6 // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
   7 // under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #include <vector>
  12 #include <iostream>
  13 // back-end
  14 #include <boost/msm/back/state_machine.hpp>
  15 //front-end
  16 #include <boost/msm/front/state_machine_def.hpp>
  17 // functors
  18 #include <boost/msm/front/functor_row.hpp>
  19 #include <boost/msm/front/euml/common.hpp>
  20
  21 #include "Empty.hpp"
  22 #include "Open.hpp"
  23
  24 using namespace std;
  25 namespace msm = boost::msm;
  26 namespace mpl = boost::mpl;
  27 using namespace msm::front;
  28
  29
  30 // front-end: define the FSM structure
  31 struct player_ : public msm::front::state_machine_def<player_>
  32 {
  33     // the initial state of the player SM. Must be defined
  34     typedef Empty initial_state;
  35     typedef mpl::vector<Empty,Open> explicit_creation;
  36
  37     typedef player_ p; // makes transition table cleaner
  38
  39     // Replaces the default no-transition response.
  40     template <class FSM,class Event>
  41     void no_transition(Event const& e, FSM&,int state)
  42     {
  43         std::cout << "no transition from state " << state
  44             << " on event " << typeid(e).name() << std::endl;
  45     }
  46 };
  47 // Pick a back-end
  48 typedef msm::back::state_machine<player_> player;
  49
  50 //
  51 // Testing utilities.
  52 //
  53 static char const* const state_names[] = { "Empty", "Open" };
  54 void pstate(player const& p)
  55 {
  56     std::cout << " -> " << state_names[p.current_state()[0]] << std::endl;
  57 }
  58
  59 void test()
  60 {
  61     player p;
  62     // needed to start the highest-level SM. This will call on_entry and mark the start of the SM
  63     p.start();
  64     // go to Open, call on_exit on Empty, then action, then on_entry on Open
  65     p.process_event(open_close()); pstate(p);
  66     p.process_event(open_close()); pstate(p);
  67 }
  68
  69 int main()
  70 {
  71     test();
  72     return 0;
  73 }
  74