// sigslot.h: Signal/Slot classes
//
// Written by Sarah Thompson (sarah@telergy.com) 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.
//
// 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 <list>
#include <set>

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

#ifndef SIGSLOT_EMIT
#	ifdef QT_VERSION
#		define SIGSLOT_EMIT broadcast
#	else
#		define SIGSLOT_EMIT emit
#	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 ~_connection_base0() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_EMIT() = 0;
        virtual _connection_base0* clone() = 0;
        virtual _connection_base0* duplicate(has_slots<mt_policy>* pnewdest) = 0;
};

template<class arg1_type, class mt_policy>
class _connection_base1
{
public:
        virtual ~_connection_base1() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_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 ~_connection_base2() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_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 arg1_type, class arg2_type, class arg3_type, class mt_policy>
class _connection_base3
{
public:
        virtual ~_connection_base3() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_EMIT(arg1_type, arg2_type, arg3_type) = 0;
        virtual _connection_base3<arg1_type, arg2_type, arg3_type, mt_policy>* clone() = 0;
        virtual _connection_base3<arg1_type, arg2_type, arg3_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type, class mt_policy>
class _connection_base4
{
public:
        virtual ~_connection_base4() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_EMIT(arg1_type, arg2_type, arg3_type, arg4_type) = 0;
        virtual _connection_base4<arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>* clone() = 0;
        virtual _connection_base4<arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type,
         class arg5_type, class mt_policy>
class _connection_base5
{
public:
        virtual ~_connection_base5() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_EMIT(arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type) = 0;
        virtual _connection_base5<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, mt_policy>* clone() = 0;
        virtual _connection_base5<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type,
         class arg5_type, class arg6_type, class mt_policy>
class _connection_base6
{
public:
        virtual ~_connection_base6() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_EMIT(arg1_type, arg2_type, arg3_type, arg4_type, arg5_type,
                                  arg6_type) = 0;
        virtual _connection_base6<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, mt_policy>* clone() = 0;
        virtual _connection_base6<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type,
         class arg5_type, class arg6_type, class arg7_type, class mt_policy>
class _connection_base7
{
public:
        virtual ~_connection_base7() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_EMIT(arg1_type, arg2_type, arg3_type, arg4_type, arg5_type,
                                  arg6_type, arg7_type) = 0;
        virtual _connection_base7<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, arg7_type, mt_policy>* clone() = 0;
        virtual _connection_base7<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, arg7_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type,
         class arg5_type, class arg6_type, class arg7_type, class arg8_type, class mt_policy>
class _connection_base8
{
public:
        virtual ~_connection_base8() {}
        virtual has_slots<mt_policy>* getdest() const = 0;
        virtual void SIGSLOT_EMIT(arg1_type, arg2_type, arg3_type, arg4_type, arg5_type,
                                  arg6_type, arg7_type, arg8_type) = 0;
        virtual _connection_base8<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>* clone() = 0;
        virtual _connection_base8<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest) = 0;
};

template<class mt_policy>
class _signal_base : public 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;
};

// Implements common functionality of signalN classes. signalN classes
// derive from this class.
template<class T, class mt_policy>
class _signal_base_middle: public _signal_base<mt_policy>
{
public:

        typedef T connections_list;
        typedef typename connections_list::iterator iterator;
        typedef typename connections_list::const_iterator const_iterator;

        _signal_base_middle() {}

        _signal_base_middle(const _signal_base_middle<connections_list, mt_policy> &s)
            : _signal_base<mt_policy>(s)
        {
                lock_block<mt_policy> lock(this);

                const_iterator it = s.m_connected_slots.begin();
                const_iterator itEnd = s.m_connected_slots.end();

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

        virtual ~_signal_base_middle() {}

        void disconnect_all()
        {
                lock_block<mt_policy> lock(this);

                const_iterator it = m_connected_slots.begin();
                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());
        }

        bool is_empty()
        {
                lock_block<mt_policy> lock(this);

                const_iterator it = m_connected_slots.begin();
                const_iterator itEnd = m_connected_slots.end();

                return it == itEnd;
        }

#ifdef _DEBUG
        bool connected(has_slots<mt_policy>* pclass)
        {
                lock_block<mt_policy> lock(this);

                const_iterator itNext, it = m_connected_slots.begin();
                const_iterator itEnd = m_connected_slots.end();

                while(it != itEnd)
                {
                        itNext = it;
                        ++itNext;
                        if ((*it)->getdest() == pclass)
                                return true;
                        it = itNext;
                }
                return false;
        }
#endif

        void disconnect(has_slots<mt_policy>* pclass)
        {
                lock_block<mt_policy> lock(this);

                iterator it = m_connected_slots.begin();
                iterator itEnd = m_connected_slots.end();

                while(it != itEnd)
                {
                        if((*it)->getdest() == pclass)
                        {
                                delete *it;
                                m_connected_slots.erase(it);
                                pclass->signal_disconnect(this);
                                return;
                        }

                        ++it;
                }
        }

        void slot_disconnect(has_slots<mt_policy>* pslot)
        {
                lock_block<mt_policy> lock(this);

                iterator it = m_connected_slots.begin();
                iterator itEnd = m_connected_slots.end();

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

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

                        it = itNext;
                }
        }

        void slot_duplicate(const has_slots<mt_policy>* oldtarget, has_slots<mt_policy>* newtarget)
        {
                lock_block<mt_policy> lock(this);

                iterator it = m_connected_slots.begin();
                iterator itEnd = m_connected_slots.end();

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

                        ++it;
                }
        }

protected:

        connections_list m_connected_slots;

};

template<class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class has_slots : public mt_policy
{
private:
        typedef typename 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 dest_type, class mt_policy>
class _connection0 : public _connection_base0<mt_policy>
{
public:
        _connection0()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

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

        virtual ~_connection0()
        {}

        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 SIGSLOT_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()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

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

        virtual ~_connection1()
        {}

        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 SIGSLOT_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()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

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

        virtual ~_connection2()
        {}

        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 SIGSLOT_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 dest_type, class arg1_type, class arg2_type, class arg3_type, class mt_policy>
class _connection3 : public _connection_base3<arg1_type, arg2_type, arg3_type, mt_policy>
{
public:
        _connection3()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

        _connection3(dest_type* pobject, void (dest_type::*pmemfun)(arg1_type,
                                                                    arg2_type, arg3_type))
        {
                m_pobject = pobject;
                m_pmemfun = pmemfun;
        }

        virtual ~_connection3()
        {}

        virtual _connection_base3<arg1_type, arg2_type, arg3_type, mt_policy>* clone()
        {
                return new _connection3<dest_type, arg1_type, arg2_type, arg3_type, mt_policy>(*this);
        }

        virtual _connection_base3<arg1_type, arg2_type, arg3_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
        {
                return new _connection3<dest_type, arg1_type, arg2_type, arg3_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
        }

        virtual void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3)
        {
                (m_pobject->*m_pmemfun)(a1, a2, a3);
        }

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

private:
        dest_type* m_pobject;
        void (dest_type::* m_pmemfun)(arg1_type, arg2_type, arg3_type);
};

template<class dest_type, class arg1_type, class arg2_type, class arg3_type,
         class arg4_type, class mt_policy>
class _connection4 : public _connection_base4<arg1_type, arg2_type,
                                              arg3_type, arg4_type, mt_policy>
{
public:
        _connection4()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

        _connection4(dest_type* pobject, void (dest_type::*pmemfun)(arg1_type,
                                                                    arg2_type, arg3_type, arg4_type))
        {
                m_pobject = pobject;
                m_pmemfun = pmemfun;
        }

        virtual ~_connection4()
        {}

        virtual _connection_base4<arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>* clone()
        {
                return new _connection4<dest_type, arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>(*this);
        }

        virtual _connection_base4<arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
        {
                return new _connection4<dest_type, arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
        }

        virtual void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3,
                                  arg4_type a4)
        {
                (m_pobject->*m_pmemfun)(a1, a2, a3, a4);
        }

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

private:
        dest_type* m_pobject;
        void (dest_type::* m_pmemfun)(arg1_type, arg2_type, arg3_type,
                                     arg4_type);
};

template<class dest_type, class arg1_type, class arg2_type, class arg3_type,
         class arg4_type, class arg5_type, class mt_policy>
class _connection5 : public _connection_base5<arg1_type, arg2_type,
                                              arg3_type, arg4_type, arg5_type, mt_policy>
{
public:
        _connection5()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

        _connection5(dest_type* pobject, void (dest_type::*pmemfun)(arg1_type,
                                                                    arg2_type, arg3_type, arg4_type, arg5_type))
        {
                m_pobject = pobject;
                m_pmemfun = pmemfun;
        }

        virtual ~_connection5()
        {}

        virtual _connection_base5<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, mt_policy>* clone()
        {
                return new _connection5<dest_type, arg1_type, arg2_type, arg3_type, arg4_type,
                                        arg5_type, mt_policy>(*this);
        }

        virtual _connection_base5<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
        {
                return new _connection5<dest_type, arg1_type, arg2_type, arg3_type, arg4_type,
                                        arg5_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
        }

        virtual void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                                  arg5_type a5)
        {
                (m_pobject->*m_pmemfun)(a1, a2, a3, a4, a5);
        }

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

private:
        dest_type* m_pobject;
        void (dest_type::* m_pmemfun)(arg1_type, arg2_type, arg3_type, arg4_type,
                                     arg5_type);
};

template<class dest_type, class arg1_type, class arg2_type, class arg3_type,
         class arg4_type, class arg5_type, class arg6_type, class mt_policy>
class _connection6 : public _connection_base6<arg1_type, arg2_type,
                                              arg3_type, arg4_type, arg5_type, arg6_type, mt_policy>
{
public:
        _connection6()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

        _connection6(dest_type* pobject, void (dest_type::*pmemfun)(arg1_type,
                                                                    arg2_type, arg3_type, arg4_type, arg5_type, arg6_type))
        {
                m_pobject = pobject;
                m_pmemfun = pmemfun;
        }

        virtual ~_connection6()
        {}

        virtual _connection_base6<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, mt_policy>* clone()
        {
                return new _connection6<dest_type, arg1_type, arg2_type, arg3_type, arg4_type,
                                        arg5_type, arg6_type, mt_policy>(*this);
        }

        virtual _connection_base6<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
        {
                return new _connection6<dest_type, arg1_type, arg2_type, arg3_type, arg4_type,
                                        arg5_type, arg6_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
        }

        virtual void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                                  arg5_type a5, arg6_type a6)
        {
                (m_pobject->*m_pmemfun)(a1, a2, a3, a4, a5, a6);
        }

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

private:
        dest_type* m_pobject;
        void (dest_type::* m_pmemfun)(arg1_type, arg2_type, arg3_type, arg4_type,
                                     arg5_type, arg6_type);
};

template<class dest_type, class arg1_type, class arg2_type, class arg3_type,
         class arg4_type, class arg5_type, class arg6_type, class arg7_type, class mt_policy>
class _connection7 : public _connection_base7<arg1_type, arg2_type,
                                              arg3_type, arg4_type, arg5_type, arg6_type, arg7_type, mt_policy>
{
public:
        _connection7()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

        _connection7(dest_type* pobject, void (dest_type::*pmemfun)(arg1_type,
                                                                    arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, arg7_type))
        {
                m_pobject = pobject;
                m_pmemfun = pmemfun;
        }

        virtual ~_connection7()
        {}

        virtual _connection_base7<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, arg7_type, mt_policy>* clone()
        {
                return new _connection7<dest_type, arg1_type, arg2_type, arg3_type, arg4_type,
                                        arg5_type, arg6_type, arg7_type, mt_policy>(*this);
        }

        virtual _connection_base7<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, arg7_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
        {
                return new _connection7<dest_type, arg1_type, arg2_type, arg3_type, arg4_type,
                                        arg5_type, arg6_type, arg7_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
        }

        virtual void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                                  arg5_type a5, arg6_type a6, arg7_type a7)
        {
                (m_pobject->*m_pmemfun)(a1, a2, a3, a4, a5, a6, a7);
        }

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

private:
        dest_type* m_pobject;
        void (dest_type::* m_pmemfun)(arg1_type, arg2_type, arg3_type, arg4_type,
                                     arg5_type, arg6_type, arg7_type);
};

template<class dest_type, class arg1_type, class arg2_type, class arg3_type,
         class arg4_type, class arg5_type, class arg6_type, class arg7_type,
         class arg8_type, class mt_policy>
class _connection8 : public _connection_base8<arg1_type, arg2_type,
                                              arg3_type, arg4_type, arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>
{
public:
        _connection8()
        {
                m_pobject = NULL;
                m_pmemfun = NULL;
        }

        _connection8(dest_type* pobject, void (dest_type::*pmemfun)(arg1_type,
                                                                    arg2_type, arg3_type, arg4_type, arg5_type, arg6_type,
                                                                    arg7_type, arg8_type))
        {
                m_pobject = pobject;
                m_pmemfun = pmemfun;
        }

        virtual ~_connection8()
        {}

        virtual _connection_base8<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>* clone()
        {
                return new _connection8<dest_type, arg1_type, arg2_type, arg3_type, arg4_type,
                                        arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>(*this);
        }

        virtual _connection_base8<arg1_type, arg2_type, arg3_type, arg4_type,
                                  arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>* duplicate(has_slots<mt_policy>* pnewdest)
        {
                return new _connection8<dest_type, arg1_type, arg2_type, arg3_type, arg4_type,
                                        arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>((dest_type *)pnewdest, m_pmemfun);
        }

        virtual void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                                  arg5_type a5, arg6_type a6, arg7_type a7, arg8_type a8)
        {
                (m_pobject->*m_pmemfun)(a1, a2, a3, a4, a5, a6, a7, a8);
        }

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

private:
        dest_type* m_pobject;
        void (dest_type::* m_pmemfun)(arg1_type, arg2_type, arg3_type, arg4_type,
                                     arg5_type, arg6_type, arg7_type, arg8_type);
};

template<class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal0 : public _signal_base_middle<std::list<_connection_base0<mt_policy>*>, mt_policy>
{
public:

        typedef signal0<mt_policy> this_type;
        typedef std::list<_connection_base0<mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal0()
        {}

        signal0(const this_type& s)
            : base_type(s)
        {}

        ~signal0()
        {
                base_type::disconnect_all();
        }

        template<class desttype>
        void connect(desttype* pclass, void (desttype::*pmemfun)())
        {
                lock_block<mt_policy> lock(this);

                _connection0<desttype, mt_policy>* conn =
                        new _connection0<desttype, mt_policy>(pclass, pmemfun);

                m_connected_slots.push_back(conn);
                pclass->signal_connect(this);
        }

        void SIGSLOT_EMIT()
        {
                lock_block<mt_policy> lock(this);

                typename connections_list::const_iterator itNext, it = m_connected_slots.begin();
                typename connections_list::const_iterator itEnd = m_connected_slots.end();

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

                        (*it)->SIGSLOT_EMIT();

                        it = itNext;
                }
        }

        void operator()()
        {
                SIGSLOT_EMIT();
        }
};

template<class arg1_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal1 : public _signal_base_middle<std::list<_connection_base1<arg1_type, mt_policy>*>, mt_policy>
{
public:

        typedef signal1<arg1_type, mt_policy> this_type;
        typedef std::list<_connection_base1<arg1_type, mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal1()
        {}

        signal1(const this_type& s)
            : base_type(s)
        {}

        ~signal1()
        {
                base_type::disconnect_all();
        }

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

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

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

                        (*it)->SIGSLOT_EMIT(a1);

                        it = itNext;
                }
        }

        void operator()(arg1_type a1)
        {
                SIGSLOT_EMIT(a1);
        }
};

template<class arg1_type, class arg2_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal2 : public _signal_base_middle<std::list<_connection_base2<arg1_type, arg2_type, mt_policy>*>, mt_policy>
{
public:

        typedef signal2<arg1_type, arg2_type, mt_policy> this_type;
        typedef std::list<_connection_base2<arg1_type, arg2_type, mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal2()
        {}

        signal2(const this_type& s)
            : base_type(s)
        {}

        ~signal2()
        {
                base_type::disconnect_all();
        }

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

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

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

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

                        it = itNext;
                }
        }

        void operator()(arg1_type a1, arg2_type a2)
        {
                SIGSLOT_EMIT(a1, a2);
        }
};

template<class arg1_type, class arg2_type, class arg3_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal3 : public _signal_base_middle<std::list<_connection_base3<arg1_type, arg2_type, arg3_type, mt_policy>*>, mt_policy>
{
public:

        typedef signal3<arg1_type, arg2_type, arg3_type, mt_policy> this_type;
        typedef std::list<_connection_base3<arg1_type, arg2_type, arg3_type, mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal3()
        {}

        signal3(const this_type& s)
            : base_type(s)
        {}

        ~signal3()
        {
                base_type::disconnect_all();
        }

        template<class desttype>
        void connect(desttype* pclass, void (desttype::*pmemfun)(arg1_type,
                                                                 arg2_type, arg3_type))
        {
                lock_block<mt_policy> lock(this);
                _connection3<desttype, arg1_type, arg2_type, arg3_type, mt_policy>* conn =
                        new _connection3<desttype, arg1_type, arg2_type, arg3_type, mt_policy>(pclass,
                                                                                               pmemfun);
                m_connected_slots.push_back(conn);
                pclass->signal_connect(this);
        }

        void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3)
        {
                lock_block<mt_policy> lock(this);
                typename connections_list::const_iterator itNext, it = m_connected_slots.begin();
                typename connections_list::const_iterator itEnd = m_connected_slots.end();

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

                        (*it)->SIGSLOT_EMIT(a1, a2, a3);

                        it = itNext;
                }
        }

        void operator()(arg1_type a1, arg2_type a2, arg3_type a3)
        {
                SIGSLOT_EMIT(a1, a2, a3);
        }
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal4 : public _signal_base_middle<std::list<_connection_base4<arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>*>, mt_policy>
{
public:

        typedef signal4<arg1_type, arg2_type, arg3_type, arg4_type, mt_policy> this_type;
        typedef std::list<_connection_base4<arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal4()
        {}

        signal4(const this_type& s)
            : base_type(s)
        {}

        ~signal4()
        {
                base_type::disconnect_all();
        }

        template<class desttype>
        void connect(desttype* pclass, void (desttype::*pmemfun)(arg1_type,
                                                                 arg2_type, arg3_type, arg4_type))
        {
                lock_block<mt_policy> lock(this);
                _connection4<desttype, arg1_type, arg2_type, arg3_type, arg4_type, mt_policy>*
                        conn = new _connection4<desttype, arg1_type, arg2_type, arg3_type,
                                                arg4_type, mt_policy>(pclass, pmemfun);
                m_connected_slots.push_back(conn);
                pclass->signal_connect(this);
        }

        void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4)
        {
                lock_block<mt_policy> lock(this);
                typename connections_list::const_iterator itNext, it = m_connected_slots.begin();
                typename connections_list::const_iterator itEnd = m_connected_slots.end();

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

                        (*it)->SIGSLOT_EMIT(a1, a2, a3, a4);

                        it = itNext;
                }
        }

        void operator()(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4)
        {
                SIGSLOT_EMIT(a1, a2, a3, a4);
        }
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type,
         class arg5_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal5 : public _signal_base_middle<std::list<_connection_base5<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, mt_policy>*>, mt_policy>
{
public:

        typedef signal5<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, mt_policy> this_type;
        typedef std::list<_connection_base5<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal5()
        {}

        signal5(const this_type& s)
            : base_type(s)
        {}

        ~signal5()
        {
                base_type::disconnect_all();
        }

        template<class desttype>
        void connect(desttype* pclass, void (desttype::*pmemfun)(arg1_type,
                                                                 arg2_type, arg3_type, arg4_type, arg5_type))
        {
                lock_block<mt_policy> lock(this);
                _connection5<desttype, arg1_type, arg2_type, arg3_type, arg4_type,
                             arg5_type, mt_policy>* conn = new _connection5<desttype, arg1_type, arg2_type,
                                                                            arg3_type, arg4_type, arg5_type, mt_policy>(pclass, pmemfun);
                m_connected_slots.push_back(conn);
                pclass->signal_connect(this);
        }

        void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                          arg5_type a5)
        {
                lock_block<mt_policy> lock(this);
                typename connections_list::const_iterator itNext, it = m_connected_slots.begin();
                typename connections_list::const_iterator itEnd = m_connected_slots.end();

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

                        (*it)->SIGSLOT_EMIT(a1, a2, a3, a4, a5);

                        it = itNext;
                }
        }

        void operator()(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                        arg5_type a5)
        {
                SIGSLOT_EMIT(a1, a2, a3, a4, a5);
        }
};


template<class arg1_type, class arg2_type, class arg3_type, class arg4_type,
         class arg5_type, class arg6_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal6 : public _signal_base_middle<std::list<_connection_base6<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, mt_policy>*>, mt_policy>
{
public:

        typedef signal6<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, mt_policy> this_type;
        typedef std::list<_connection_base6<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal6()
        {}

        signal6(const this_type& s)
            : base_type(s)
        {}

        ~signal6()
        {
                base_type::disconnect_all();
        }

        template<class desttype>
        void connect(desttype* pclass, void (desttype::*pmemfun)(arg1_type,
                                                                 arg2_type, arg3_type, arg4_type, arg5_type, arg6_type))
        {
                lock_block<mt_policy> lock(this);
                _connection6<desttype, arg1_type, arg2_type, arg3_type, arg4_type,
                             arg5_type, arg6_type, mt_policy>* conn =
                        new _connection6<desttype, arg1_type, arg2_type, arg3_type,
                                         arg4_type, arg5_type, arg6_type, mt_policy>(pclass, pmemfun);
                m_connected_slots.push_back(conn);
                pclass->signal_connect(this);
        }

        void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                          arg5_type a5, arg6_type a6)
        {
                lock_block<mt_policy> lock(this);
                typename connections_list::const_iterator itNext, it = m_connected_slots.begin();
                typename connections_list::const_iterator itEnd = m_connected_slots.end();

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

                        (*it)->SIGSLOT_EMIT(a1, a2, a3, a4, a5, a6);

                        it = itNext;
                }
        }

        void operator()(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                        arg5_type a5, arg6_type a6)
        {
                SIGSLOT_EMIT(a1, a2, a3, a4, a5, a6);
        }
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type,
         class arg5_type, class arg6_type, class arg7_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal7 : public _signal_base_middle<std::list<_connection_base7<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, arg7_type, mt_policy>*>, mt_policy>
{
public:

        typedef signal7<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, arg7_type, mt_policy> this_type;
        typedef std::list<_connection_base7<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, arg7_type, mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal7()
        {}

        signal7(const this_type& s)
            : base_type(s)
        {}

        ~signal7()
        {
                base_type::disconnect_all();
        }

        template<class desttype>
        void connect(desttype* pclass, void (desttype::*pmemfun)(arg1_type,
                                                                 arg2_type, arg3_type, arg4_type, arg5_type, arg6_type,
                                                                 arg7_type))
        {
                lock_block<mt_policy> lock(this);
                _connection7<desttype, arg1_type, arg2_type, arg3_type, arg4_type,
                             arg5_type, arg6_type, arg7_type, mt_policy>* conn =
                        new _connection7<desttype, arg1_type, arg2_type, arg3_type,
                                         arg4_type, arg5_type, arg6_type, arg7_type, mt_policy>(pclass, pmemfun);
                m_connected_slots.push_back(conn);
                pclass->signal_connect(this);
        }

        void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                          arg5_type a5, arg6_type a6, arg7_type a7)
        {
                lock_block<mt_policy> lock(this);
                typename connections_list::const_iterator itNext, it = m_connected_slots.begin();
                typename connections_list::const_iterator itEnd = m_connected_slots.end();

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

                        (*it)->SIGSLOT_EMIT(a1, a2, a3, a4, a5, a6, a7);

                        it = itNext;
                }
        }

        void operator()(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                        arg5_type a5, arg6_type a6, arg7_type a7)
        {
                SIGSLOT_EMIT(a1, a2, a3, a4, a5, a6, a7);
        }
};

template<class arg1_type, class arg2_type, class arg3_type, class arg4_type,
         class arg5_type, class arg6_type, class arg7_type, class arg8_type, class mt_policy = SIGSLOT_DEFAULT_MT_POLICY>
class signal8 : public _signal_base_middle<std::list<_connection_base8<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>*>, mt_policy>
{
public:

        typedef signal8<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, arg7_type, arg8_type, mt_policy> this_type;
        typedef std::list<_connection_base8<arg1_type, arg2_type, arg3_type, arg4_type, arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>*> connections_list;
        typedef _signal_base_middle<connections_list, mt_policy> base_type;

        using base_type::m_connected_slots;

        signal8()
        {}

        signal8(const this_type& s)
            : base_type(s)
        {}

        ~signal8()
        {
                base_type::disconnect_all();
        }

        template<class desttype>
        void connect(desttype* pclass, void (desttype::*pmemfun)(arg1_type,
                                                                 arg2_type, arg3_type, arg4_type, arg5_type, arg6_type,
                                                                 arg7_type, arg8_type))
        {
                lock_block<mt_policy> lock(this);
                _connection8<desttype, arg1_type, arg2_type, arg3_type, arg4_type,
                             arg5_type, arg6_type, arg7_type, arg8_type, mt_policy>* conn =
                        new _connection8<desttype, arg1_type, arg2_type, arg3_type,
                                         arg4_type, arg5_type, arg6_type, arg7_type,
                                         arg8_type, mt_policy>(pclass, pmemfun);
                m_connected_slots.push_back(conn);
                pclass->signal_connect(this);
        }

        void SIGSLOT_EMIT(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                          arg5_type a5, arg6_type a6, arg7_type a7, arg8_type a8)
        {
                lock_block<mt_policy> lock(this);
                typename connections_list::const_iterator itNext, it = m_connected_slots.begin();
                typename connections_list::const_iterator itEnd = m_connected_slots.end();

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

                        (*it)->SIGSLOT_EMIT(a1, a2, a3, a4, a5, a6, a7, a8);

                        it = itNext;
                }
        }

        void operator()(arg1_type a1, arg2_type a2, arg3_type a3, arg4_type a4,
                        arg5_type a5, arg6_type a6, arg7_type a7, arg8_type a8)
        {
                SIGSLOT_EMIT(a1, a2, a3, a4, a5, a6, a7, a8);
        }
};

namespace impl
{

struct empty {};

} // namespace impl

// signal can be used instead of the numbered signalN classes.
// For example:
//
//     sigslot::signal<int, double> signal;
//
// instead of
//
//     sigslot::signal2<int, double> signal;
template<typename A1 = impl::empty, typename A2 = impl::empty,
         typename A3 = impl::empty, typename A4 = impl::empty,
         typename A5 = impl::empty, typename A6 = impl::empty,
         typename A7 = impl::empty, typename A8 = impl::empty>
struct signal;

template<>
struct signal<>: public signal0<>
{};

template<typename A1>
struct signal<A1>: public signal1<A1>
{};

template<typename A1, typename A2>
struct signal<A1, A2>: public signal2<A1, A2>
{};

template<typename A1, typename A2, typename A3>
struct signal<A1, A2, A3>: public signal3<A1, A2, A3>
{};

template<typename A1, typename A2, typename A3, typename A4>
struct signal<A1, A2, A3, A4>: public signal4<A1, A2, A3, A4>
{};

template<typename A1, typename A2, typename A3, typename A4, typename A5>
struct signal<A1, A2, A3, A4, A5>: public signal5<A1, A2, A3, A4, A5>
{};

template<typename A1, typename A2, typename A3, typename A4, typename A5,
         typename A6>
struct signal<A1, A2, A3, A4, A5, A6>: public signal6<A1, A2, A3, A4, A5, A6>
{};

template<typename A1, typename A2, typename A3, typename A4, typename A5,
         typename A6, typename A7>
struct signal<A1, A2, A3, A4, A5, A6, A7>:
    public signal7<A1, A2, A3, A4, A5, A6, A7>
{};

template<typename A1, typename A2, typename A3, typename A4, typename A5,
         typename A6, typename A7, typename A8>
struct signal: public signal8<A1, A2, A3, A4, A5, A6, A7, A8>
{};

// Some convenience methods for signal handling.
template<typename Derived>
struct has_signals
{
        virtual ~has_signals() {}

        // Connect a signal to a slot on the specified destination object.
        template<typename Signal, typename Dst, typename Sig>
        static inline void connect(Signal &signal, Dst *dst, Sig memfun)
        {
                signal.connect(dst, memfun);
        }

        // Connect a signal to a slot on 'this'.
        template<typename Signal, typename Sig>
        inline void connect(Signal &signal, Sig memfun)
        {
                Derived* dst = static_cast<Derived*>(this);
                connect(signal, dst, memfun);
        }
};

}; // namespace sigslot

#endif // __SIGSLOT_H__