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authorRemko Tronçon <git@el-tramo.be>2009-06-01 08:48:42 (GMT)
committerRemko Tronçon <git@el-tramo.be>2009-06-01 09:24:28 (GMT)
commit2812bddd81f8a1b804c7460f4e14cd0aa393d129 (patch)
treed46294f35150c4f0f43deaf2d31fceaf945ae715 /3rdParty/Boost/libs/signals/src/signal_base.cpp
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diff --git a/3rdParty/Boost/libs/signals/src/signal_base.cpp b/3rdParty/Boost/libs/signals/src/signal_base.cpp
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+// Boost.Signals library
+
+// Copyright Douglas Gregor 2001-2004. Use, modification and
+// distribution is subject to the Boost Software License, Version
+// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+// For more information, see http://www.boost.org
+
+#define BOOST_SIGNALS_SOURCE
+
+#include <boost/signals/detail/signal_base.hpp>
+#include <cassert>
+
+namespace boost {
+ namespace BOOST_SIGNALS_NAMESPACE {
+ namespace detail {
+ signal_base_impl::signal_base_impl(const compare_type& comp,
+ const any& combiner)
+ : call_depth(0),
+ slots_(comp),
+ combiner_(combiner)
+ {
+ 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 (iterator i = slots_.begin(); i != slots_.end(); ++i) {
+ i->first.disconnect();
+ }
+ }
+ }
+
+ connection
+ signal_base_impl::
+ connect_slot(const any& slot_,
+ const stored_group& name,
+ shared_ptr<slot_base::data_t> data,
+ connect_position at)
+ {
+ // Transfer the burden of ownership to a local, scoped
+ // connection.
+ data->watch_bound_objects.set_controlling(false);
+ scoped_connection safe_connection(data->watch_bound_objects);
+
+ // 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<iterator> saved_iter(new iterator);
+
+ // Add the slot to the list.
+ iterator pos =
+ slots_.insert(name, data->watch_bound_objects, slot_, at);
+
+ // 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
+ data->watch_bound_objects.get_connection()->signal = this;
+ data->watch_bound_objects.get_connection()->signal_data =
+ saved_iter.release();
+ data->watch_bound_objects.get_connection()->signal_disconnect =
+ &signal_base_impl::slot_disconnected;
+
+ // Make the copy of the connection in the list disconnect when it is
+ // destroyed. The local, scoped connection is then released
+ // because ownership has been transferred.
+ pos->first.set_controlling();
+ return safe_connection.release();
+ }
+
+ 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 (iterator i = slots_.begin(); i != slots_.end(); ++i) {
+ if (i->first.connected())
+ return false;
+ }
+
+ return true;
+ }
+
+ std::size_t signal_base_impl::num_slots() 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
+ std::size_t count = 0;
+ for (iterator i = slots_.begin(); i != slots_.end(); ++i) {
+ if (i->first.connected())
+ ++count;
+ }
+ return count;
+ }
+
+ void signal_base_impl::disconnect(const stored_group& group)
+ { slots_.disconnect(group); }
+
+ 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<iterator> slot(reinterpret_cast<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
+ { slots_.remove_disconnected_slots(); }
+
+ 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(const compare_type& comp, const any& combiner)
+ : impl()
+ {
+ impl.reset(new signal_base_impl(comp, combiner));
+ }
+
+ signal_base::~signal_base()
+ {
+ }
+
+ } // namespace detail
+ } // namespace BOOST_SIGNALS_NAMESPACE
+} // namespace boost
+