// 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 <set>#include <list>// On our copy of sigslot.h, we force single threading#define SIGSLOT_PURE_ISO
#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#endifnamespace 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* clone() = 0;		virtual _connection_base0* 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 arg1_type, class arg2_type, class arg3_type, class mt_policy>	class _connection_base3	{	public:		virtual has_slots<mt_policy>* getdest() const = 0;		virtual void 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 has_slots<mt_policy>* getdest() const = 0;		virtual void 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 has_slots<mt_policy>* getdest() const = 0;		virtual void 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 has_slots<mt_policy>* getdest() const = 0;		virtual void 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 has_slots<mt_policy>* getdest() const = 0;		virtual void 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 has_slots<mt_policy>* getdest() const = 0;		virtual void 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;	};	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 mt_policy>	class _signal_base0 : public _signal_base<mt_policy>	{	public:		typedef std::list<_connection_base0<mt_policy> *>  connections_list;		_signal_base0()		{			;		}		_signal_base0(const _signal_base0& 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;			}		}		~_signal_base0()		{			disconnect_all();		}		void disconnect_all()		{			lock_block<mt_policy> lock(this);			typename connections_list::const_iterator it = m_connected_slots.begin();