ceph/src/boost/libs/statechart/include/boost/statechart/event_base.hpp

   1 #ifndef BOOST_STATECHART_EVENT_BASE_HPP_INCLUDED
   2 #define BOOST_STATECHART_EVENT_BASE_HPP_INCLUDED
   3 //////////////////////////////////////////////////////////////////////////////
   4 // Copyright 2002-2006 Andreas Huber Doenni
   5 // Distributed under the Boost Software License, Version 1.0. (See accompany-
   6 // ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 //////////////////////////////////////////////////////////////////////////////
   8
   9
  10
  11 #include <boost/statechart/detail/rtti_policy.hpp>
  12 #include <boost/statechart/detail/counted_base.hpp>
  13
  14 #include <boost/assert.hpp>
  15 #include <boost/intrusive_ptr.hpp>
  16 #include <boost/config.hpp>
  17
  18
  19
  20 namespace boost
  21 {
  22 namespace statechart
  23 {
  24 namespace detail
  25 {
  26
  27
  28
  29 // This helper is necessary because there doesn't seem to be consensus among
  30 // compilers on how a friend declaration for a function in another namespace
  31 // has to look like.
  32 class delete_helper
  33 {
  34   public:
  35     template< class T >
  36     static void delete_object( const T * pObject )
  37     {
  38       delete pObject;
  39     }
  40 };
  41
  42
  43
  44 } // namespace detail
  45
  46
  47
  48 //////////////////////////////////////////////////////////////////////////////
  49 class event_base : public detail::rtti_policy::rtti_base_type<
  50   detail::counted_base<> >
  51 {
  52   typedef detail::rtti_policy::rtti_base_type<
  53     detail::counted_base<> > base_type;
  54   public:
  55     //////////////////////////////////////////////////////////////////////////
  56     intrusive_ptr< const event_base > intrusive_from_this() const;
  57
  58   protected:
  59     //////////////////////////////////////////////////////////////////////////
  60     event_base( detail::rtti_policy::id_provider_type idProvider ) :
  61       base_type( idProvider )
  62     {
  63     }
  64
  65     virtual ~event_base() {}
  66
  67   private:
  68     //////////////////////////////////////////////////////////////////////////
  69     virtual intrusive_ptr< const event_base > clone() const = 0;
  70
  71     friend class detail::delete_helper;
  72 };
  73
  74
  75
  76 #ifdef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
  77 } // namespace statechart
  78 #endif
  79
  80
  81
  82 inline void intrusive_ptr_add_ref( const ::boost::statechart::event_base * pBase )
  83 {
  84   pBase->add_ref();
  85 }
  86
  87 inline void intrusive_ptr_release( const ::boost::statechart::event_base * pBase )
  88 {
  89   if ( pBase->release() )
  90   {
  91     ::boost::statechart::detail::delete_helper::delete_object( pBase );
  92   }
  93 }
  94
  95
  96
  97 #ifndef BOOST_NO_ARGUMENT_DEPENDENT_LOOKUP
  98 } // namespace statechart
  99 #endif
 100 namespace statechart
 101 {
 102
 103
 104
 105 // We're implementing this here so that GCC3.4.2 can find
 106 // intrusive_ptr_add_ref, which is indirectly called from the intrusive_ptr
 107 // ctor.
 108 inline intrusive_ptr< const event_base > event_base::intrusive_from_this() const
 109 {
 110   if ( base_type::ref_counted() )
 111   {
 112     return intrusive_ptr< const event_base >( this );
 113   }
 114   else
 115   {
 116     return clone();
 117   }
 118 }
 119
 120
 121
 122 } // namespace statechart
 123 } // namespace boost
 124
 125
 126
 127 #endif