ceph/src/boost/libs/signals/include/boost/signals/detail/signal_base.hpp

   1 // Boost.Signals library
   2
   3 // Copyright Douglas Gregor 2001-2004. Use, modification and
   4 // distribution is subject to the Boost Software License, Version
   5 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7
   8 // For more information, see http://www.boost.org
   9
  10 #ifndef BOOST_SIGNALS_SIGNAL_BASE_HEADER
  11 #define BOOST_SIGNALS_SIGNAL_BASE_HEADER
  12
  13 #include <boost/signals/detail/config.hpp>
  14 #include <boost/signals/detail/signals_common.hpp>
  15 #include <boost/signals/detail/named_slot_map.hpp>
  16 #include <boost/signals/connection.hpp>
  17 #include <boost/signals/trackable.hpp>
  18 #include <boost/signals/slot.hpp>
  19 #include <boost/smart_ptr.hpp>
  20 #include <boost/noncopyable.hpp>
  21 #include <boost/function/function2.hpp>
  22 #include <utility>
  23 #include <vector>
  24
  25 #ifdef BOOST_HAS_ABI_HEADERS
  26 #  include BOOST_ABI_PREFIX
  27 #endif
  28
  29 namespace boost {
  30   namespace BOOST_SIGNALS_NAMESPACE {
  31     namespace detail {
  32       // Must be constructed before calling the slots, because it safely
  33       // manages call depth
  34       class BOOST_SIGNALS_DECL call_notification {
  35       public:
  36         call_notification(const shared_ptr<signal_base_impl>&);
  37         ~call_notification();
  38
  39         shared_ptr<signal_base_impl> impl;
  40       };
  41
  42       // Implementation of base class for all signals. It handles the
  43       // management of the underlying slot lists.
  44       class BOOST_SIGNALS_DECL signal_base_impl {
  45       public:
  46         friend class call_notification;
  47
  48         typedef function2<bool, stored_group, stored_group> compare_type;
  49
  50         // Make sure that an exception does not cause the "clearing" flag to
  51         // remain set
  52         class temporarily_set_clearing {
  53         public:
  54           temporarily_set_clearing(signal_base_impl* b) : base(b)
  55           {
  56             base->flags.clearing = true;
  57           }
  58
  59           ~temporarily_set_clearing()
  60           {
  61             base->flags.clearing = false;
  62           }
  63
  64         private:
  65           signal_base_impl* base;
  66         };
  67
  68         friend class temporarily_set_clearing;
  69
  70         signal_base_impl(const compare_type&, const any&);
  71         ~signal_base_impl();
  72
  73         // Disconnect all slots connected to this signal
  74         void disconnect_all_slots();
  75
  76         // Are there any connected slots?
  77         bool empty() const;
  78
  79         // The number of connected slots
  80         std::size_t num_slots() const;
  81
  82         // Disconnect all slots in the given group
  83         void disconnect(const stored_group&);
  84
  85         // We're being notified that a slot has disconnected
  86         static void slot_disconnected(void* obj, void* data);
  87
  88         connection connect_slot(const any& slot,
  89                                 const stored_group& name,
  90                                 shared_ptr<slot_base::data_t> data,
  91                                 connect_position at);
  92
  93       private:
  94         // Remove all of the slots that have been marked "disconnected"
  95         void remove_disconnected_slots() const;
  96
  97       public:
  98         // Our call depth when invoking slots (> 1 when we have a loop)
  99         mutable int call_depth;
 100
 101         struct {
 102           // True if some slots have disconnected, but we were not able to
 103           // remove them from the list of slots because there are valid
 104           // iterators into the slot list
 105           mutable bool delayed_disconnect:1;
 106
 107           // True if we are disconnecting all disconnected slots
 108           bool clearing:1;
 109         } flags;
 110
 111         // Slots
 112         mutable named_slot_map slots_;
 113         any combiner_;
 114
 115         // Types
 116         typedef named_slot_map::iterator iterator;
 117       };
 118
 119       class BOOST_SIGNALS_DECL signal_base : public noncopyable {
 120       public:
 121         typedef signal_base_impl::compare_type compare_type;
 122
 123         friend class call_notification;
 124
 125         signal_base(const compare_type& comp, const any& combiner);
 126         ~signal_base();
 127
 128       public:
 129         // Disconnect all slots connected to this signal
 130         void disconnect_all_slots() { impl->disconnect_all_slots(); }
 131
 132         // Are there any connected slots?
 133         bool empty() const { return impl->empty(); }
 134
 135         // How many slots are connected?
 136         std::size_t num_slots() const { return impl->num_slots(); }
 137
 138       protected:
 139         connection connect_slot(const any& slot,
 140                                 const stored_group& name,
 141                                 shared_ptr<slot_base::data_t> data,
 142                                 connect_position at)
 143         {
 144           return impl->connect_slot(slot, name, data, at);
 145         }
 146
 147         typedef named_slot_map::iterator iterator;
 148
 149         shared_ptr<signal_base_impl> impl;
 150       };
 151     } // end namespace detail
 152   } // end namespace BOOST_SIGNALS_NAMESPACE
 153 } // end namespace boost
 154
 155 #ifdef BOOST_HAS_ABI_HEADERS
 156 #  include BOOST_ABI_SUFFIX
 157 #endif
 158
 159 #endif // BOOST_SIGNALS_SIGNAL_BASE_HEADER