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237 lines
8.5 KiB
C++
237 lines
8.5 KiB
C++
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// Boost.Signals library
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//
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// Copyright (C) 2001 Doug Gregor (gregod@cs.rpi.edu)
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//
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// Permission to copy, use, sell and distribute this software is granted
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// provided this copyright notice appears in all copies.
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// Permission to modify the code and to distribute modified code is granted
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// provided this copyright notice appears in all copies, and a notice
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// that the code was modified is included with the copyright notice.
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//
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// This software is provided "as is" without express or implied warranty,
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// and with no claim as to its suitability for any purpose.
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// For more information, see http://www.boost.org
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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 signals {
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namespace detail {
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signal_base_impl::signal_base_impl(const compare_type& comp) :
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call_depth(0),
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slots(comp)
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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 (slot_iterator i = slots.begin(); i != slots.end(); ++i) {
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i->second.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 any& name,
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const std::vector<const trackable*>& bound_objects)
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{
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// Allocate storage for a new basic_connection object to represent the
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// connection
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basic_connection* con = new basic_connection();
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// Create a new connection handle object and place the basic_connection
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// object we just created under its control. Note that the "reset"
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// routine will delete con if allocation throws.
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connection slot_connection;
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slot_connection.reset(con);
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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<slot_iterator> saved_iter(new slot_iterator());
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// Add the slot to the list.
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slot_iterator pos =
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slots.insert(stored_slot_type(name,
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connection_slot_pair(slot_connection,
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slot)));
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// Make the copy of the connection in the list disconnect when it is
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// destroyed
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pos->second.first.set_controlling();
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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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con->signal = this;
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con->signal_data = saved_iter.release();
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con->signal_disconnect = &signal_base_impl::slot_disconnected;
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// If an exception is thrown the connection will automatically be
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// disconnected.
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scoped_connection safe_connection = slot_connection;
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// Connect each of the bound objects
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for(std::vector<const trackable*>::const_iterator i =
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bound_objects.begin();
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i != bound_objects.end();
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++i) {
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// Notify the object that the signal is connecting to it by passing
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// it a copy of the connection. If the connection
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// should throw, the scoped connection safe_connection will
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// disconnect the connection completely.
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bound_object binding;
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(*i)->signal_connected(slot_connection, binding);
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// This will notify the bound object that the connection just made
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// should be disconnected if an exception is thrown before the
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// end of this iteration
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auto_disconnect_bound_object disconnector(binding);
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// Add the binding to the list of bindings for the connection.
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con->bound_objects.push_back(binding);
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// The connection object now knows about the bound object, so if an
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// exception is thrown later the connection object will notify the
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// bound object of the disconnection automatically
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disconnector.release();
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}
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// No exceptions will be thrown past this point, and we must not
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// disconnect the connection now
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safe_connection.release();
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return slot_connection;
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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 (slot_iterator i = slots.begin(); i != slots.end(); ++i) {
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if (i->second.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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void signal_base_impl::disconnect(const any& group)
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{
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std::pair<slot_iterator, slot_iterator> group_slots =
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slots.equal_range(group);
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while (group_slots.first != group_slots.second) {
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slot_iterator next = group_slots.first;
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++next;
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group_slots.first->second.first.disconnect();
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group_slots.first = next;
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}
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}
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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<slot_iterator> slot(
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reinterpret_cast<slot_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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{
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// Remove any disconnected slots
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for (slot_iterator i = slots.begin(); i != slots.end(); /* none */) {
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if (!i->second.first.connected())
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slots.erase(i++);
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else
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++i;
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}
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}
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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()
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{
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}
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} // namespace detail
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} // namespace signals
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} // namespace boost
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#ifndef BOOST_MSVC
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// Explicit instantiations to keep in the library
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template class boost::function2<bool, boost::any, boost::any>;
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template class std::multimap<boost::any,
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boost::signals::detail::connection_slot_pair,
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boost::function2<bool, boost::any, boost::any> >;
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#endif
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