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160 lines
4.9 KiB
C++
160 lines
4.9 KiB
C++
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// 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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#ifndef BOOST_SIGNALS_SIGNAL_BASE_HEADER
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#define BOOST_SIGNALS_SIGNAL_BASE_HEADER
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#include <boost/signals/detail/config.hpp>
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#include <boost/signals/detail/signals_common.hpp>
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#include <boost/signals/detail/named_slot_map.hpp>
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#include <boost/signals/connection.hpp>
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#include <boost/signals/trackable.hpp>
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#include <boost/signals/slot.hpp>
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#include <boost/smart_ptr.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/function/function2.hpp>
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#include <utility>
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#include <vector>
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_PREFIX
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#endif
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namespace boost {
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namespace BOOST_SIGNALS_NAMESPACE {
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namespace detail {
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// Must be constructed before calling the slots, because it safely
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// manages call depth
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class BOOST_SIGNALS_DECL call_notification {
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public:
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call_notification(const shared_ptr<signal_base_impl>&);
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~call_notification();
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shared_ptr<signal_base_impl> impl;
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};
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// Implementation of base class for all signals. It handles the
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// management of the underlying slot lists.
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class BOOST_SIGNALS_DECL signal_base_impl {
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public:
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friend class call_notification;
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typedef function2<bool, stored_group, stored_group> compare_type;
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// Make sure that an exception does not cause the "clearing" flag to
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// remain set
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class temporarily_set_clearing {
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public:
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temporarily_set_clearing(signal_base_impl* b) : base(b)
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{
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base->flags.clearing = true;
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}
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~temporarily_set_clearing()
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{
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base->flags.clearing = false;
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}
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private:
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signal_base_impl* base;
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};
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friend class temporarily_set_clearing;
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signal_base_impl(const compare_type&, const any&);
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~signal_base_impl();
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// Disconnect all slots connected to this signal
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void disconnect_all_slots();
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// Are there any connected slots?
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bool empty() const;
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// The number of connected slots
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std::size_t num_slots() const;
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// Disconnect all slots in the given group
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void disconnect(const stored_group&);
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// We're being notified that a slot has disconnected
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static void slot_disconnected(void* obj, void* data);
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connection 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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private:
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// Remove all of the slots that have been marked "disconnected"
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void remove_disconnected_slots() const;
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public:
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// Our call depth when invoking slots (> 1 when we have a loop)
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mutable int call_depth;
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struct {
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// True if some slots have disconnected, but we were not able to
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// remove them from the list of slots because there are valid
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// iterators into the slot list
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mutable bool delayed_disconnect:1;
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// True if we are disconnecting all disconnected slots
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bool clearing:1;
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} flags;
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// Slots
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mutable named_slot_map slots_;
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any combiner_;
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// Types
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typedef named_slot_map::iterator iterator;
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};
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class BOOST_SIGNALS_DECL signal_base : public noncopyable {
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public:
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typedef signal_base_impl::compare_type compare_type;
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friend class call_notification;
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signal_base(const compare_type& comp, const any& combiner);
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~signal_base();
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public:
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// Disconnect all slots connected to this signal
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void disconnect_all_slots() { impl->disconnect_all_slots(); }
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// Are there any connected slots?
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bool empty() const { return impl->empty(); }
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// How many slots are connected?
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std::size_t num_slots() const { return impl->num_slots(); }
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protected:
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connection 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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return impl->connect_slot(slot, name, data, at);
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}
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typedef named_slot_map::iterator iterator;
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shared_ptr<signal_base_impl> impl;
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};
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} // end namespace detail
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} // end namespace BOOST_SIGNALS_NAMESPACE
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} // end namespace boost
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#ifdef BOOST_HAS_ABI_HEADERS
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# include BOOST_ABI_SUFFIX
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#endif
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#endif // BOOST_SIGNALS_SIGNAL_BASE_HEADER
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