+// Boost.Signals library
+//
+// Copyright (C) 2001 Doug Gregor (gregod@cs.rpi.edu)
+//
+// Permission to copy, use, sell and distribute this software is granted
+// provided this copyright notice appears in all copies.
+// Permission to modify the code and to distribute modified code is granted
+// provided this copyright notice appears in all copies, and a notice
+// that the code was modified is included with the copyright notice.
+//
+// This software is provided "as is" without express or implied warranty,
+// and with no claim as to its suitability for any purpose.
+
+// For more information, see http://www.boost.org
+
+#include <boost/signals/detail/signal_base.hpp>
+#include <cassert>
+
+namespace boost {
+ namespace signals {
+ namespace detail {
+ signal_base_impl::signal_base_impl(const compare_type& comp) :
+ call_depth(0),
+ slots(comp)
+ {
+ flags.delayed_disconnect = false;
+ flags.clearing = false;
+ }
+
+ signal_base_impl::~signal_base_impl()
+ {
+ // Set the "clearing" flag to ignore extraneous disconnect requests,
+ // because all slots will be disconnected on destruction anyway.
+ flags.clearing = true;
+ }
+
+ void signal_base_impl::disconnect_all_slots()
+ {
+ // Do nothing if we're already clearing the slot list
+ if (flags.clearing)
+ return;
+
+ if (call_depth == 0) {
+ // Clearing the slot list will disconnect all slots automatically
+ temporarily_set_clearing set_clearing(this);
+ slots.clear();
+ }
+ else {
+ // We can't actually remove elements from the slot list because there
+ // are still iterators into the slot list that must not be
+ // invalidated by this operation. So just disconnect each slot
+ // without removing it from the slot list. When the call depth does
+ // reach zero, the call list will be cleared.
+ flags.delayed_disconnect = true;
+ temporarily_set_clearing set_clearing(this);
+ for (slot_iterator i = slots.begin(); i != slots.end(); ++i) {
+ i->second.first.disconnect();
+ }
+ }
+ }
+
+ connection
+ signal_base_impl::
+ connect_slot(const any& slot,
+ const any& name,
+ const std::vector<const trackable*>& bound_objects)
+ {
+ // Allocate storage for a new basic_connection object to represent the
+ // connection
+ basic_connection* con = new basic_connection();
+
+ // Create a new connection handle object and place the basic_connection
+ // object we just created under its control. Note that the "reset"
+ // routine will delete con if allocation throws.
+ connection slot_connection;
+ slot_connection.reset(con);
+
+ // Allocate storage for an iterator that will hold the point of
+ // insertion of the slot into the list. This is used to later remove
+ // the slot when it is disconnected.
+ std::auto_ptr<slot_iterator> saved_iter(new slot_iterator());
+
+ // Add the slot to the list.
+
+ slot_iterator pos =
+ slots.insert(stored_slot_type(name,
+ connection_slot_pair(slot_connection,
+ slot)));
+
+ // Make the copy of the connection in the list disconnect when it is
+ // destroyed
+ pos->second.first.set_controlling();
+
+ // The assignment operation here absolutely must not throw, which
+ // intuitively makes sense (because any container's insert method
+ // becomes impossible to use in an exception-safe manner without this
+ // assumption), but doesn't appear to be mentioned in the standard.
+ *saved_iter = pos;
+
+ // Fill out the connection object appropriately. None of these
+ // operations can throw
+ con->signal = this;
+ con->signal_data = saved_iter.release();
+ con->signal_disconnect = &signal_base_impl::slot_disconnected;
+
+ // If an exception is thrown the connection will automatically be
+ // disconnected.
+ scoped_connection safe_connection = slot_connection;
+
+ // Connect each of the bound objects
+ for(std::vector<const trackable*>::const_iterator i =
+ bound_objects.begin();
+ i != bound_objects.end();
+ ++i) {
+ // Notify the object that the signal is connecting to it by passing
+ // it a copy of the connection. If the connection
+ // should throw, the scoped connection safe_connection will
+ // disconnect the connection completely.
+ bound_object binding;
+ (*i)->signal_connected(slot_connection, binding);
+
+ // This will notify the bound object that the connection just made
+ // should be disconnected if an exception is thrown before the
+ // end of this iteration
+ auto_disconnect_bound_object disconnector(binding);
+
+ // Add the binding to the list of bindings for the connection.
+ con->bound_objects.push_back(binding);
+
+ // The connection object now knows about the bound object, so if an
+ // exception is thrown later the connection object will notify the
+ // bound object of the disconnection automatically
+ disconnector.release();
+ }
+
+ // No exceptions will be thrown past this point, and we must not
+ // disconnect the connection now
+ safe_connection.release();
+
+ return slot_connection;
+ }
+
+ bool signal_base_impl::empty() const
+ {
+ // Disconnected slots may still be in the list of slots if
+ // a) this is called while slots are being invoked (call_depth > 0)
+ // b) an exception was thrown in remove_disconnected_slots
+ for (slot_iterator i = slots.begin(); i != slots.end(); ++i) {
+ if (i->second.first.connected())
+ return false;
+ }
+
+ return true;
+ }
+
+ void signal_base_impl::disconnect(const any& group)
+ {
+ std::pair<slot_iterator, slot_iterator> group_slots =
+ slots.equal_range(group);
+ while (group_slots.first != group_slots.second) {
+ slot_iterator next = group_slots.first;
+ ++next;
+
+ group_slots.first->second.first.disconnect();
+ group_slots.first = next;
+ }
+ }
+
+ void signal_base_impl::slot_disconnected(void* obj, void* data)
+ {
+ signal_base_impl* self = reinterpret_cast<signal_base_impl*>(obj);
+
+ // We won't need the slot iterator after this
+ std::auto_ptr<slot_iterator> slot(
+ reinterpret_cast<slot_iterator*>(data));
+
+ // If we're flags.clearing, we don't bother updating the list of slots
+ if (!self->flags.clearing) {
+ // If we're in a call, note the fact that a slot has been deleted so
+ // we can come back later to remove the iterator
+ if (self->call_depth > 0) {
+ self->flags.delayed_disconnect = true;
+ }
+ else {
+ // Just remove the slot now, it's safe
+ self->slots.erase(*slot);
+ }
+ }
+ }
+
+ void signal_base_impl::remove_disconnected_slots() const
+ {
+ // Remove any disconnected slots
+ for (slot_iterator i = slots.begin(); i != slots.end(); /* none */) {
+ if (!i->second.first.connected())
+ slots.erase(i++);
+ else
+ ++i;
+ }
+ }
+
+ call_notification::
+ call_notification(const shared_ptr<signal_base_impl>& b) :
+ impl(b)
+ {
+ // A call will be made, so increment the call depth as a notification
+ impl->call_depth++;
+ }
+
+ call_notification::~call_notification()
+ {
+ impl->call_depth--;
+
+ // If the call depth is zero and we have some slots that have been
+ // disconnected during the calls, remove those slots from the list
+ if (impl->call_depth == 0 &&
+ impl->flags.delayed_disconnect) {
+ impl->remove_disconnected_slots();
+ impl->flags.delayed_disconnect = false;
+ }
+ }
+
+ signal_base::~signal_base()
+ {
+ }
+ } // namespace detail
+ } // namespace signals
+} // namespace boost
+
+#ifndef BOOST_MSVC
+// Explicit instantiations to keep in the library
+template class boost::function2<bool, boost::any, boost::any>;
+template class std::multimap<boost::any,
+ boost::signals::detail::connection_slot_pair,
+ boost::function2<bool, boost::any, boost::any> >;
+#endif