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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@13298 a592a061-630c-0410-9148-cb99ea01b6c8
190 lines
6.5 KiB
C++
190 lines
6.5 KiB
C++
// Boost.Signals library
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// Copyright Douglas Gregor 2001-2004. Use, modification and
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// distribution is subject to the Boost Software License, Version
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// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// For more information, see http://www.boost.org
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#define BOOST_SIGNALS_SOURCE
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#include <boost/signals/detail/signal_base.hpp>
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#include <cassert>
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namespace boost {
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namespace BOOST_SIGNALS_NAMESPACE {
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namespace detail {
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signal_base_impl::signal_base_impl(const compare_type& comp,
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const any& combiner)
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: call_depth(0),
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slots_(comp),
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combiner_(combiner)
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{
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flags.delayed_disconnect = false;
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flags.clearing = false;
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}
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signal_base_impl::~signal_base_impl()
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{
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// Set the "clearing" flag to ignore extraneous disconnect requests,
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// because all slots will be disconnected on destruction anyway.
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flags.clearing = true;
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}
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void signal_base_impl::disconnect_all_slots()
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{
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// Do nothing if we're already clearing the slot list
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if (flags.clearing)
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return;
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if (call_depth == 0) {
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// Clearing the slot list will disconnect all slots automatically
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temporarily_set_clearing set_clearing(this);
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slots_.clear();
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}
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else {
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// We can't actually remove elements from the slot list because there
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// are still iterators into the slot list that must not be
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// invalidated by this operation. So just disconnect each slot
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// without removing it from the slot list. When the call depth does
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// reach zero, the call list will be cleared.
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flags.delayed_disconnect = true;
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temporarily_set_clearing set_clearing(this);
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for (iterator i = slots_.begin(); i != slots_.end(); ++i) {
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i->first.disconnect();
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}
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}
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}
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connection
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signal_base_impl::
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connect_slot(const any& slot_,
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const stored_group& name,
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shared_ptr<slot_base::data_t> data,
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connect_position at)
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{
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// Transfer the burden of ownership to a local, scoped
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// connection.
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data->watch_bound_objects.set_controlling(false);
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scoped_connection safe_connection(data->watch_bound_objects);
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// Allocate storage for an iterator that will hold the point of
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// insertion of the slot into the list. This is used to later remove
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// the slot when it is disconnected.
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std::auto_ptr<iterator> saved_iter(new iterator);
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// Add the slot to the list.
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iterator pos =
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slots_.insert(name, data->watch_bound_objects, slot_, at);
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// The assignment operation here absolutely must not throw, which
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// intuitively makes sense (because any container's insert method
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// becomes impossible to use in an exception-safe manner without this
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// assumption), but doesn't appear to be mentioned in the standard.
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*saved_iter = pos;
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// Fill out the connection object appropriately. None of these
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// operations can throw
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data->watch_bound_objects.get_connection()->signal = this;
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data->watch_bound_objects.get_connection()->signal_data =
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saved_iter.release();
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data->watch_bound_objects.get_connection()->signal_disconnect =
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&signal_base_impl::slot_disconnected;
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// Make the copy of the connection in the list disconnect when it is
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// destroyed. The local, scoped connection is then released
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// because ownership has been transferred.
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pos->first.set_controlling();
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return safe_connection.release();
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}
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bool signal_base_impl::empty() const
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{
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// Disconnected slots may still be in the list of slots if
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// a) this is called while slots are being invoked (call_depth > 0)
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// b) an exception was thrown in remove_disconnected_slots
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for (iterator i = slots_.begin(); i != slots_.end(); ++i) {
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if (i->first.connected())
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return false;
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}
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return true;
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}
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std::size_t signal_base_impl::num_slots() const
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{
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// Disconnected slots may still be in the list of slots if
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// a) this is called while slots are being invoked (call_depth > 0)
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// b) an exception was thrown in remove_disconnected_slots
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std::size_t count = 0;
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for (iterator i = slots_.begin(); i != slots_.end(); ++i) {
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if (i->first.connected())
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++count;
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}
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return count;
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}
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void signal_base_impl::disconnect(const stored_group& group)
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{ slots_.disconnect(group); }
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void signal_base_impl::slot_disconnected(void* obj, void* data)
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{
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signal_base_impl* self = reinterpret_cast<signal_base_impl*>(obj);
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// We won't need the slot iterator after this
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std::auto_ptr<iterator> slot(reinterpret_cast<iterator*>(data));
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// If we're flags.clearing, we don't bother updating the list of slots
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if (!self->flags.clearing) {
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// If we're in a call, note the fact that a slot has been deleted so
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// we can come back later to remove the iterator
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if (self->call_depth > 0) {
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self->flags.delayed_disconnect = true;
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}
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else {
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// Just remove the slot now, it's safe
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self->slots_.erase(*slot);
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}
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}
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}
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void signal_base_impl::remove_disconnected_slots() const
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{ slots_.remove_disconnected_slots(); }
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call_notification::
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call_notification(const shared_ptr<signal_base_impl>& b) :
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impl(b)
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{
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// A call will be made, so increment the call depth as a notification
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impl->call_depth++;
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}
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call_notification::~call_notification()
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{
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impl->call_depth--;
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// If the call depth is zero and we have some slots that have been
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// disconnected during the calls, remove those slots from the list
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if (impl->call_depth == 0 &&
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impl->flags.delayed_disconnect) {
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impl->remove_disconnected_slots();
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impl->flags.delayed_disconnect = false;
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}
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}
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signal_base::signal_base(const compare_type& comp, const any& combiner)
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: impl()
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{
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impl.reset(new signal_base_impl(comp, combiner));
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}
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signal_base::~signal_base()
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{
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}
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} // namespace detail
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} // namespace BOOST_SIGNALS_NAMESPACE
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} // namespace boost
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