Updated Changelog

[centerim/davrieb.git] / libicq2000 / libicq2000 / sigslot.h

// sigslot.h: Signal/Slot classes
// 
// Written by Sarah Thompson (sarah@telergy.com) 2002.
// Additions by Barnaby Gray (barnaby@pickle.me.uk) 2002.
//
// License: Public domain. You are free to use this code however you like, with the proviso that
//          the author takes on no responsibility or liability for any use.
//
// This file is generated! DO NOT EDIT!
// Edit the original sigslot.pl script.
//
// QUICK DOCUMENTATION 
//              
//                              (see also the full documentation at http://sigslot.sourceforge.net/)
//
//              #define switches
//                      SIGSLOT_PURE_ISO                        - Define this to force ISO C++ compliance. This also disables
//                                                                                all of the thread safety support on platforms where it is 
//                                                                                available.
//
//                      SIGSLOT_USE_POSIX_THREADS       - Force use of Posix threads when using a C++ compiler other than
//                                                                                gcc on a platform that supports Posix threads. (When using gcc,
//                                                                                this is the default - use SIGSLOT_PURE_ISO to disable this if 
//                                                                                necessary)
//
//                      SIGSLOT_DEFAULT_MT_POLICY       - Where thread support is enabled, this defaults to multi_threaded_global.
//                                                                                Otherwise, the default is single_threaded. #define this yourself to
//                                                                                override the default. In pure ISO mode, anything other than
//                                                                                single_threaded will cause a compiler error.
//
//              PLATFORM NOTES
//
//                      Win32                                           - On Win32, the WIN32 symbol must be #defined. Most mainstream
//                                                                                compilers do this by default, but you may need to define it
//                                                                                yourself if your build environment is less standard. This causes
//                                                                                the Win32 thread support to be compiled in and used automatically.
//
//                      Unix/Linux/BSD, etc.            - If you're using gcc, it is assumed that you have Posix threads
//                                                                                available, so they are used automatically. You can override this
//                                                                                (as under Windows) with the SIGSLOT_PURE_ISO switch. If you're using
//                                                                                something other than gcc but still want to use Posix threads, you
//                                                                                need to #define SIGSLOT_USE_POSIX_THREADS.
//
//                      ISO C++                                         - If none of the supported platforms are detected, or if
//                                                                                SIGSLOT_PURE_ISO is defined, all multithreading support is turned off,
//                                                                                along with any code that might cause a pure ISO C++ environment to
//                                                                                complain. Before you ask, gcc -ansi -pedantic won't compile this 
//                                                                                library, but gcc -ansi is fine. Pedantic mode seems to throw a lot of
//                                                                                errors that aren't really there. If you feel like investigating this,
//                                                                                please contact the author.
//
//              
//              THREADING MODES
//
//                      single_threaded                         - Your program is assumed to be single threaded from the point of view
//                                                                                of signal/slot usage (i.e. all objects using signals and slots are
//                                                                                created and destroyed from a single thread). Behaviour if objects are
//                                                                                destroyed concurrently is undefined (i.e. you'll get the occasional
//                                                                                segmentation fault/memory exception).
//
//                      multi_threaded_global           - Your program is assumed to be multi threaded. Objects using signals and
//                                                                                slots can be safely created and destroyed from any thread, even when
//                                                                                connections exist. In multi_threaded_global mode, this is achieved by a
//                                                                                single global mutex (actually a critical section on Windows because they
//                                                                                are faster). This option uses less OS resources, but results in more
//                                                                                opportunities for contention, possibly resulting in more context switches
//                                                                                than are strictly necessary.
//
//                      multi_threaded_local            - Behaviour in this mode is essentially the same as multi_threaded_global,
//                                                                                except that each signal, and each object that inherits has_slots, all 
//                                                                                have their own mutex/critical section. In practice, this means that
//                                                                                mutex collisions (and hence context switches) only happen if they are
//                                                                                absolutely essential. However, on some platforms, creating a lot of 
//                                                                                mutexes can slow down the whole OS, so use this option with care.
//
//              USING THE LIBRARY
//
//                      See the full documentation at http://sigslot.sourceforge.net/
//
//

#ifndef SIGSLOT_H__
#define SIGSLOT_H__

#include <set>
#include <list>

#if defined(SIGSLOT_PURE_ISO) || (!defined(WIN32) && !defined(SIGSLOT_USE_POSIX_THREADS))
#       define _SIGSLOT_SINGLE_THREADED
#elif defined(WIN32)
#       define _SIGSLOT_HAS_WIN32_THREADS
#       include <windows.h>
#elif defined(SIGSLOT_USE_POSIX_THREADS)
#       define _SIGSLOT_HAS_POSIX_THREADS
#       include <pthread.h>
#else
#       define _SIGSLOT_SINGLE_THREADED
#endif

#ifndef SIGSLOT_DEFAULT_MT_POLICY
#       ifdef _SIGSLOT_SINGLE_THREADED
#               define SIGSLOT_DEFAULT_MT_POLICY single_threaded
#       else
#               define SIGSLOT_DEFAULT_MT_POLICY multi_threaded_local
#       endif
#endif


namespace sigslot {

        class single_threaded
        {
        public:
                single_threaded()
                {
                        ;
                }

                virtual ~single_threaded()
                {
                        ;
                }

                virtual void lock()
                {
                        ;
                }

                virtual void unlock()
                {
                        ;
                }
        };

#ifdef _SIGSLOT_HAS_WIN32_THREADS
        // The multi threading policies only get compiled in if they are enabled.
        class multi_threaded_global
        {
        public:
                multi_threaded_global()
                {
                        static bool isinitialised = false;

                        if(!isinitialised)
                        {
                                InitializeCriticalSection(get_critsec());
                                isinitialised = true;
                        }
                }

                multi_threaded_global(const multi_threaded_global&)
                {
                        ;
                }

                virtual ~multi_threaded_global()
                {
                        ;
                }

                virtual void lock()
                {
                        EnterCriticalSection(get_critsec());
                }

                virtual void unlock()
                {
                        LeaveCriticalSection(get_critsec());
                }

        private:
                CRITICAL_SECTION* get_critsec()
                {
                        static CRITICAL_SECTION g_critsec;
                        return &g_critsec;
                }
        };

        class multi_threaded_local
        {
        public:
                multi_threaded_local()
                {
                        InitializeCriticalSection(&m_critsec);
                }

                multi_threaded_local(const multi_threaded_local&)
                {
                        InitializeCriticalSection(&m_critsec);
                }

                virtual ~multi_threaded_local()
                {
                        DeleteCriticalSection(&m_critsec);
                }

                virtual void lock()
                {
                        EnterCriticalSection(&m_critsec);
                }

                virtual void unlock()
                {
                        LeaveCriticalSection(&m_critsec);
                }

        private:
                CRITICAL_SECTION m_critsec;
        };
#endif // _SIGSLOT_HAS_WIN32_THREADS

#ifdef _SIGSLOT_HAS_POSIX_THREADS
        // The multi threading policies only get compiled in if they are enabled.
        class multi_threaded_global
        {
        public:
                multi_threaded_global()
                {
                        pthread_mutex_init(get_mutex(), NULL);
                }

                multi_threaded_global(const multi_threaded_global&)
                {
                        ;
                }

                virtual ~multi_threaded_global()
                {
                        ;
                }

                virtual void lock()
                {
                        pthread_mutex_lock(get_mutex());
                }

                virtual void unlock()
                {
                        pthread_mutex_unlock(get_mutex());
                }

        private:
                pthread_mutex_t* get_mutex()
                {
                        static pthread_mutex_t g_mutex;
                        return &g_mutex;
                }
        };

        class multi_threaded_local
        {
        public:
                multi_threaded_local()
                {
                        pthread_mutex_init(&m_mutex, NULL);
                }

                multi_threaded_local(const multi_threaded_local&)
                {
                        pthread_mutex_init(&m_mutex, NULL);
                }

                virtual ~multi_threaded_local()
                {
                        pthread_mutex_destroy(&m_mutex);
                }

                virtual void lock()
                {
                        pthread_mutex_lock(&m_mutex);
                }

                virtual void unlock()
                {
                        pthread_mutex_unlock(&m_mutex);
                }

        private:
                pthread_mutex_t m_mutex;
        };
#endif // _SIGSLOT_HAS_POSIX_THREADS

        template<class mt_policy>
        class lock_block
        {
        public:
                mt_policy *m_mutex;

                lock_block(mt_policy *mtx)
                        : m_mutex(mtx)
                {
                        m_mutex->lock();
                }

                ~lock_block()
                {
                        m_mutex->unlock();
                }
        };

        template<class mt_policy>
        class has_slots;

        template<class mt_policy>
        class _connection_base0
        {
        public:
                virtual has_slots<mt_policy>* getdest() const = 0;
                virtual void emit() = 0;
                virtual _connection_base0<mt_policy>* clone() = 0;
                virtual _connection_base0<mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
        };

        template<class arg1_type, class mt_policy>
        class _connection_base1
        {
        public:
                virtual has_slots<mt_policy>* getdest() const = 0;
                virtual void emit(arg1_type) = 0;
                virtual _connection_base1<arg1_type, mt_policy>* clone() = 0;
                virtual _connection_base1<arg1_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
        };

        template<class arg1_type, class arg2_type, class mt_policy>
        class _connection_base2
        {
        public:
                virtual has_slots<mt_policy>* getdest() const = 0;
                virtual void emit(arg1_type, arg2_type) = 0;
                virtual _connection_base2<arg1_type, arg2_type, mt_policy>* clone() = 0;
                virtual _connection_base2<arg1_type, arg2_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
        };

        template<class mt_policy>
        class _signal_base : public has_slots<mt_policy>
        {
        public:
                virtual void slot_disconnect(has_slots<mt_policy>* pslot) = 0;
                virtual void slot_duplicate(const has_slots<mt_policy>* poldslot, has_slots<mt_policy>* pnewslot) = 0;
        };

        template<class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
        class has_slots : public mt_policy 
        {
        private:
                typedef std::set<_signal_base<mt_policy> *> sender_set;
                typedef typename sender_set::const_iterator const_iterator;

        public:
                has_slots()
                {
                        ;
                }

                has_slots(const has_slots& hs)
                        : mt_policy(hs)
                {
                        lock_block<mt_policy> lock(this);
                        const_iterator it = hs.m_senders.begin();
                        const_iterator itEnd = hs.m_senders.end();

                        while(it != itEnd)
                        {
                                (*it)->slot_duplicate(&hs, this);
                                m_senders.insert(*it);
                                ++it;
                        }
                } 

                void signal_connect(_signal_base<mt_policy>* sender)
                {
                        lock_block<mt_policy> lock(this);
                        m_senders.insert(sender);
                }

                void signal_disconnect(_signal_base<mt_policy>* sender)
                {
                        lock_block<mt_policy> lock(this);
                        m_senders.erase(sender);
                }

                virtual ~has_slots()
                {
                        disconnect_all();
                }

                void disconnect_all()
                {
                        lock_block<mt_policy> lock(this);
                        const_iterator it = m_senders.begin();
                        const_iterator itEnd = m_senders.end();

                        while(it != itEnd)
                        {
                                (*it)->slot_disconnect(this);
                                ++it;
                        }

                        m_senders.erase(m_senders.begin(), m_senders.end());
                }

        private:
                sender_set m_senders;
        };

        template<class mt_policy>
        class _signal_base0 : public _signal_base<mt_policy>
        {
        public:
                typedef typename std::list<_connection_base0<mt_policy> *>
                        connections_list;

                _signal_base0()
                {
                        ;
                }

                _signal_base0(const _signal_base0<mt_policy>& s)
                        : _signal_base<mt_policy>(s)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::const_iterator it = s.m_connected_slots.begin();
                        typename connections_list::const_iterator itEnd = s.m_connected_slots.end();

                        while(it != itEnd)
                        {
                                (*it)->getdest()->signal_connect(this);
                                m_connected_slots.push_back((*it)->clone());

                                ++it;
                        }
                }

                void slot_duplicate(const has_slots<mt_policy>* oldtarget, has_slots<mt_policy>* newtarget)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                if((*it)->getdest() == oldtarget)
                                {
                                        m_connected_slots.push_back((*it)->duplicate(newtarget));
                                }

                                ++it;
                        }
                }

                ~_signal_base0()
                {
                        disconnect_all();
                }

                void disconnect_all()
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::const_iterator it = m_connected_slots.begin();
                        typename connections_list::const_iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                (*it)->getdest()->signal_disconnect(this);
                                delete *it;

                                ++it;
                        }

                        m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
                }

                void disconnect(has_slots<mt_policy>* pclass)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                typename connections_list::iterator itNext = it;
                                ++itNext;
                                
                                if((*it)->getdest() == pclass)
                                {
                                        delete *it;
                                        m_connected_slots.erase(it);
                                        pclass->signal_disconnect(this);
                                        return;
                                }

                                it = itNext;
                        }
                }

                void slot_disconnect(has_slots<mt_policy>* pslot)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                typename connections_list::iterator itNext = it;
                                ++itNext;

                                if((*it)->getdest() == pslot)
                                {
                                        delete *it;
                                        m_connected_slots.erase(it);
                                }

                                it = itNext;
                        }
                }

        protected:
                connections_list m_connected_slots;   
        };

        template<class arg1_type, class mt_policy>
        class _signal_base1 : public _signal_base<mt_policy>
        {
        public:
                typedef typename std::list<_connection_base1<arg1_type, mt_policy> *>
                        connections_list;

                _signal_base1()
                {
                        ;
                }

                _signal_base1(const _signal_base1<arg1_type, mt_policy>& s)
                        : _signal_base<mt_policy>(s)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::const_iterator it = s.m_connected_slots.begin();
                        typename connections_list::const_iterator itEnd = s.m_connected_slots.end();

                        while(it != itEnd)
                        {
                                (*it)->getdest()->signal_connect(this);
                                m_connected_slots.push_back((*it)->clone());

                                ++it;
                        }
                }

                void slot_duplicate(const has_slots<mt_policy>* oldtarget, has_slots<mt_policy>* newtarget)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                if((*it)->getdest() == oldtarget)
                                {
                                        m_connected_slots.push_back((*it)->duplicate(newtarget));
                                }

                                ++it;
                        }
                }

                ~_signal_base1()
                {
                        disconnect_all();
                }

                void disconnect_all()
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::const_iterator it = m_connected_slots.begin();
                        typename connections_list::const_iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                (*it)->getdest()->signal_disconnect(this);
                                delete *it;

                                ++it;
                        }

                        m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
                }

                void disconnect(has_slots<mt_policy>* pclass)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                typename connections_list::iterator itNext = it;
                                ++itNext;
                                
                                if((*it)->getdest() == pclass)
                                {
                                        delete *it;
                                        m_connected_slots.erase(it);
                                        pclass->signal_disconnect(this);
                                        return;
                                }

                                it = itNext;
                        }
                }

                void slot_disconnect(has_slots<mt_policy>* pslot)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                typename connections_list::iterator itNext = it;
                                ++itNext;

                                if((*it)->getdest() == pslot)
                                {
                                        delete *it;
                                        m_connected_slots.erase(it);
                                }

                                it = itNext;
                        }
                }

        protected:
                connections_list m_connected_slots;   
        };

        template<class arg1_type, class arg2_type, class mt_policy>
        class _signal_base2 : public _signal_base<mt_policy>
        {
        public:
                typedef typename std::list<_connection_base2<arg1_type, arg2_type, mt_policy> *>
                        connections_list;

                _signal_base2()
                {
                        ;
                }

                _signal_base2(const _signal_base2<arg1_type, arg2_type, mt_policy>& s)
                        : _signal_base<mt_policy>(s)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::const_iterator it = s.m_connected_slots.begin();
                        typename connections_list::const_iterator itEnd = s.m_connected_slots.end();

                        while(it != itEnd)
                        {
                                (*it)->getdest()->signal_connect(this);
                                m_connected_slots.push_back((*it)->clone());

                                ++it;
                        }
                }

                void slot_duplicate(const has_slots<mt_policy>* oldtarget, has_slots<mt_policy>* newtarget)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                if((*it)->getdest() == oldtarget)
                                {
                                        m_connected_slots.push_back((*it)->duplicate(newtarget));
                                }

                                ++it;
                        }
                }

                ~_signal_base2()
                {
                        disconnect_all();
                }

                void disconnect_all()
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::const_iterator it = m_connected_slots.begin();
                        typename connections_list::const_iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                (*it)->getdest()->signal_disconnect(this);
                                delete *it;

                                ++it;
                        }

                        m_connected_slots.erase(m_connected_slots.begin(), m_connected_slots.end());
                }

                void disconnect(has_slots<mt_policy>* pclass)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                typename connections_list::iterator itNext = it;
                                ++itNext;
                                if((*it)->getdest() == pclass)
                                {
                                        delete *it;
                                        m_connected_slots.erase(it);
                                        pclass->signal_disconnect(this);
                                        return;
                                }

                                it = itNext;
                        }
                }

                void slot_disconnect(has_slots<mt_policy>* pslot)
                {
                        lock_block<mt_policy> lock(this);
                        typename connections_list::iterator it = m_connected_slots.begin();
                        typename connections_list::iterator itEnd = m_connected_slots.end();

                        while(it != itEnd)
                        {
                                typename connections_list::iterator itNext = it;
                                ++itNext;

                                if((*it)->getdest() == pslot)
                                {
                                        delete *it;
                                        m_connected_slots.erase(it);
                                }

                                it = itNext;
                        }
                }

        protected:
                connections_list m_connected_slots;   
        };

        template<class dest_type, class mt_policy>
        class _connection0 : public _connection_base0<mt_policy>
        {
        public:
                _connection0()
                {
                        this->pobject = NULL;
                        this->pmemfun = NULL;
                }

                _connection0(dest_type* pobject, void (dest_type::*pmemfun)())
                {
                        m_pobject = pobject;
                        m_pmemfun = pmemfun;
                }

                virtual _connection_base0<mt_policy>* clone()
                {
                        return new _connection0<dest_type, mt_policy>(*this);
                }

                virtual _connection_base0<mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
                {
                        return new _connection0<dest_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
                }

                virtual void emit()
                {
                        (m_pobject->*m_pmemfun)();
                }

                virtual has_slots<mt_policy>* getdest() const
                {
                        return m_pobject;
                }

        private:
                dest_type* m_pobject;
                void (dest_type::* m_pmemfun)();
        };

        template<class dest_type, class arg1_type, class mt_policy>
        class _connection1 : public _connection_base1<arg1_type, mt_policy>
        {
        public:
                _connection1()
                {
                        this->pobject = NULL;
                        this->pmemfun = NULL;
                }

                _connection1(dest_type* pobject, void (dest_type::*pmemfun)(arg1_type))
                {
                        m_pobject = pobject;
                        m_pmemfun = pmemfun;
                }

                virtual _connection_base1<arg1_type, mt_policy>* clone()
                {
                        return new _connection1<dest_type, arg1_type, mt_policy>(*this);
                }

                virtual _connection_base1<arg1_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
                {
                        return new _connection1<dest_type, arg1_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
                }

                virtual void emit(arg1_type a1)
                {
                        (m_pobject->*m_pmemfun)(a1);
                }

                virtual has_slots<mt_policy>* getdest() const
                {
                        return m_pobject;
                }

        private:
                dest_type* m_pobject;
                void (dest_type::* m_pmemfun)(arg1_type);
        };

        template<class dest_type, class arg1_type, class arg2_type, class mt_policy>
        class _connection2 : public _connection_base2<arg1_type, arg2_type, mt_policy>
        {
        public:
                _connection2()
                {
                        this->pobject = NULL;
                        this->pmemfun = NULL;
                }

                _connection2(dest_type* pobject, void (dest_type::*pmemfun)(arg1_type, arg2_type))
                {
                        m_pobject = pobject;
                        m_pmemfun = pmemfun;
                }

                virtual _connection_base2<arg1_type, arg2_type, mt_policy>* clone()
                {
                        return new _connection2<dest_type, arg1_type, arg2_type, mt_policy>(*this);
                }

                virtual _connection_base2<arg1_type, arg2_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
                {
                        return new _connection2<dest_type, arg1_type, arg2_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
                }

                virtual void emit(arg1_type a1, arg2_type a2)
                {
                        (m_pobject->*m_pmemfun)(a1, a2);
                }

                virtual has_slots<mt_policy>* getdest() const
                {
                        return m_pobject;
                }

        private:
                dest_type* m_pobject;
                void (dest_type::* m_pmemfun)(arg1_type, arg2_type);
        };

        template<class mt_policy>
        class _sig_connection0;
        template<class arg1_type, class mt_policy>
        class _sig_connection1;
        template<class arg1_type, class arg2_type, class mt_policy>
        class _sig_connection2;
        template<class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
        class signal0 : public _signal_base0<mt_policy>
        {
        public:
                signal0()
                {
                        ;
                }

                signal0(const signal0<mt_policy>& s)
                        : _signal_base0<mt_policy>(s)
                {
                        ;
                }

                template<class dest_type>
                        void connect(dest_type* pclass, void (dest_type::*pmemfun)())
                {
                        lock_block<mt_policy> lock(this);
                        _connection0<dest_type, mt_policy>* conn
                            = new _connection0<dest_type, mt_policy>(pclass, pmemfun);
                        this->m_connected_slots.push_back(conn);
                        pclass->signal_connect(this);
                }

                void connect(signal0<mt_policy>& chainsig)
                {
                        lock_block<mt_policy> lock(this);
                        _sig_connection0<mt_policy>* conn = new _sig_connection0<mt_policy>(chainsig);
                        this->m_connected_slots.push_back(conn);
                        chainsig.signal_connect(this);
                }

                void emit()
                {
                        lock_block<mt_policy> lock(this);
                        typename _signal_base0< mt_policy >::connections_list::const_iterator itNext, it = this->m_connected_slots.begin();
                        typename _signal_base0< mt_policy >::connections_list::const_iterator itEnd = this->m_connected_slots.end();

                        while(it != itEnd)
                        {
                                itNext = it;
                                ++itNext;

                                (*it)->emit();

                                it = itNext;
                        }
                }

                void operator()()
                {
                        lock_block<mt_policy> lock(this);
                        typename _signal_base0< mt_policy >::connections_list::connections_list::const_iterator itNext, it = this->m_connected_slots.begin();
                        typename _signal_base0< mt_policy >::connections_list::connections_list::const_iterator itEnd = this->m_connected_slots.end();

                        while(it != itEnd)
                        {
                                itNext = it;
                                ++itNext;

                                (*it)->emit();

                                it = itNext;
                        }
                }
        };

        template<class arg1_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
        class signal1 : public _signal_base1<arg1_type, mt_policy>
        {
        public:
                signal1()
                {
                        ;
                }

                signal1(const signal1<arg1_type, mt_policy>& s)
                        : _signal_base1<arg1_type, mt_policy>(s)
                {
                        ;
                }

                template<class dest_type>
                        void connect(dest_type* pclass, void (dest_type::*pmemfun)(arg1_type))
                {
                        lock_block<mt_policy> lock(this);
                        _connection1<dest_type, arg1_type, mt_policy>* conn
                            = new _connection1<dest_type, arg1_type, mt_policy>(pclass, pmemfun);
                        this->m_connected_slots.push_back(conn);
                        pclass->signal_connect(this);
                }

                void connect(signal1<arg1_type, mt_policy>& chainsig)
                {
                        lock_block<mt_policy> lock(this);
                        _sig_connection1<arg1_type, mt_policy>* conn = new _sig_connection1<arg1_type, mt_policy>(chainsig);
                        this->m_connected_slots.push_back(conn);
                        chainsig.signal_connect(this);
                }

                void emit(arg1_type a1)
                {
                        lock_block<mt_policy> lock(this);
                        typename _signal_base1<arg1_type, mt_policy >::connections_list::const_iterator itNext, it = this->m_connected_slots.begin();
                        typename _signal_base1<arg1_type, mt_policy >::connections_list::const_iterator itEnd = this->m_connected_slots.end();

                        while(it != itEnd)
                        {
                                itNext = it;
                                ++itNext;

                                (*it)->emit(a1);

                                it = itNext;
                        }
                }

                void operator()(arg1_type a1)
                {
                        lock_block<mt_policy> lock(this);
                        typename _signal_base1<arg1_type, mt_policy >::connections_list::const_iterator itNext, it = this->m_connected_slots.begin();
                        typename _signal_base1<arg1_type, mt_policy >::connections_list::const_iterator itEnd = this->m_connected_slots.end();

                        while(it != itEnd)
                        {
                                itNext = it;
                                ++itNext;

                                (*it)->emit(a1);

                                it = itNext;
                        }
                }
        };

        template<class arg1_type, class arg2_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
        class signal2 : public _signal_base2<arg1_type, arg2_type, mt_policy>
        {
        public:
                signal2()
                {
                        ;
                }

                signal2(const signal2<arg1_type, arg2_type, mt_policy>& s)
                        : _signal_base2<arg1_type, arg2_type, mt_policy>(s)
                {
                        ;
                }

                template<class dest_type>
                        void connect(dest_type* pclass, void (dest_type::*pmemfun)(arg1_type, arg2_type))
                {
                        lock_block<mt_policy> lock(this);
                        _connection2<dest_type, arg1_type, arg2_type, mt_policy>* conn
                            = new _connection2<dest_type, arg1_type, arg2_type, mt_policy>(pclass, pmemfun);
                        this->m_connected_slots.push_back(conn);
                        pclass->signal_connect(this);
                }

                void connect(signal2<arg1_type, arg2_type, mt_policy>& chainsig)
                {
                        lock_block<mt_policy> lock(this);
                        _sig_connection2<arg1_type, arg2_type, mt_policy>* conn = new _sig_connection2<arg1_type, arg2_type, mt_policy>(chainsig);
                        this->m_connected_slots.push_back(conn);
                        chainsig.signal_connect(this);
                }

                void emit(arg1_type a1, arg2_type a2)
                {
                        lock_block<mt_policy> lock(this);
                        typename _signal_base2<arg1_type, arg2_type, mt_policy>::connections_list::const_iterator itNext, it = this->m_connected_slots.begin();
                        typename _signal_base2<arg1_type, arg2_type, mt_policy>::connections_list::const_iterator itEnd = this->m_connected_slots.end();

                        while(it != itEnd)
                        {
                                itNext = it;
                                ++itNext;

                                (*it)->emit(a1, a2);

                                it = itNext;
                        }
                }

                void operator()(arg1_type a1, arg2_type a2)
                {
                        lock_block<mt_policy> lock(this);
                        typename _signal_base2<arg1_type, arg2_type, mt_policy>::connections_list::const_iterator itNext, it = this->m_connected_slots.begin();
                        typename _signal_base2<arg1_type, arg2_type, mt_policy>::connections_list::const_iterator itEnd = this->m_connected_slots.end();

                        while(it != itEnd)
                        {
                                itNext = it;
                                ++itNext;

                                (*it)->emit(a1, a2);

                                it = itNext;
                        }
                }
        };

// signal chaining connection types added by Barnaby Gray 24/11/2002

        template<class mt_policy>
        class _sig_connection0 : public _connection_base0<mt_policy>
        {
        public:
                _sig_connection0(signal0<mt_policy>& sig)
                : m_signal(sig)
                {
                }

                _sig_connection0(const _sig_connection0<mt_policy>& conn)
                : m_signal( conn.m_signal )
                {
                }

                virtual _connection_base0<mt_policy>* clone()
                {
                        return new _sig_connection0<mt_policy>(*this);
                }

                virtual _connection_base0<mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
                {
                        return new _sig_connection0<mt_policy>(m_signal);
                }

                virtual void emit()
                {
                        m_signal.emit();
                }

                virtual has_slots<mt_policy>* getdest() const
                {
                        return &m_signal;
                }

        private:
                signal0<mt_policy>& m_signal;
        };

        template<class arg1_type, class mt_policy>
        class _sig_connection1 : public _connection_base1<arg1_type, mt_policy>
        {
        public:
                _sig_connection1(signal1<arg1_type, mt_policy>& sig)
                : m_signal(sig)
                {
                }

                _sig_connection1(const _sig_connection1<arg1_type, mt_policy>& conn)
                : m_signal( conn.m_signal )
                {
                }

                virtual _connection_base1<arg1_type, mt_policy>* clone()
                {
                        return new _sig_connection1<arg1_type, mt_policy>(*this);
                }

                virtual _connection_base1<arg1_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
                {
                        return new _sig_connection1<arg1_type, mt_policy>(m_signal);
                }

                virtual void emit(arg1_type a1)
                {
                        m_signal.emit(a1);
                }

                virtual has_slots<mt_policy>* getdest() const
                {
                        return &m_signal;
                }

        private:
                signal1<arg1_type, mt_policy>& m_signal;
        };

        template<class arg1_type, class arg2_type, class mt_policy>
        class _sig_connection2 : public _connection_base2<arg1_type, arg2_type, mt_policy>
        {
        public:
                _sig_connection2(signal2<arg1_type, arg2_type, mt_policy>& sig)
                : m_signal(sig)
                {
                }

                _sig_connection2(const _sig_connection2<arg1_type, arg2_type, mt_policy>& conn)
                : m_signal( conn.m_signal )
                {
                }

                virtual _connection_base2<arg1_type, arg2_type, mt_policy>* clone()
                {
                        return new _sig_connection2<arg1_type, arg2_type, mt_policy>(*this);
                }

                virtual _connection_base2<arg1_type, arg2_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
                {
                        return new _sig_connection2<arg1_type, arg2_type, mt_policy>(m_signal);
                }

                virtual void emit(arg1_type a1, arg2_type a2)
                {
                        m_signal.emit(a1, a2);
                }

                virtual has_slots<mt_policy>* getdest() const
                {
                        return &m_signal;
                }

        private:
                signal2<arg1_type, arg2_type, mt_policy>& m_signal;
        };

} // namespace sigslot

#endif // SIGSLOT_H__