Event.h

#pragma once
#include <functional>

template<typename FuncT> class Event;


template<typename FuncT>
class _EventBase
{
protected:
	std::vector<std::function<FuncT>* > funcs;
public:
	_EventBase()
	{

	}
	~_EventBase()
	{
		for(auto it=funcs.begin();it!=funcs.end();++it)
		{
			if (*it != nullptr)
				delete *it;
		}
	}




	template<typename T>
	void * Advise(T&& f)
	{
		std::function<FuncT> * p = new std::function<FuncT>(std::forward<T>(f));
		funcs.push_back(p);
		return (void*)p;
	}
	void Unadvise(void * p)
	{
		if (p == NULL) return;
		bool bHasDelete = false;;
		for(auto it=funcs.begin();it!=funcs.end();++it)
		{
			if (*it == (std::function<FuncT>*)p)
			{
				bHasDelete = true;
				delete *it;
				*it = NULL;
			}
		}
		ATLASSERT(bHasDelete);
	}
	//C# like operator
	template<typename T>
	void * operator+=(T&& f)
	{
		return Advise(std::forward<T>(f));
	}

	void operator-=(void *p)
	{
		Unadvise(p);
	}
};

#define IMPLEMENT_OPERATOR \
	void operator()(ARG_LIST1){\
		bool bHasNull = false;\
		size_t count = funcs.size();\
		for(size_t i=0;i<count;++i)\
		{\
			if (funcs[i])\
			{\
				(*funcs[i])(ARG_LIST2);\
			}\
			else\
			{\
				bHasNull = true;\
			}\
		}\
		if (bHasNull)\
		{\
			auto newEnd = std::remove(funcs.begin(),funcs.end(),nullptr);\
			funcs.erase(newEnd,funcs.end());\
		}\
	}



class Event0:public _EventBase<void()>
{
public:
#define ARG_LIST1
#define ARG_LIST2
	IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};

template<typename Arg0>
class Event1:public _EventBase<void(Arg0)>
{
public:
#define ARG_LIST1 Arg0 a0
#define ARG_LIST2 a0
	IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};

template<typename Arg0,typename Arg1>
class Event2:public _EventBase<void(Arg0,Arg1)>
{
public:
#define ARG_LIST1 Arg0 a0,Arg1 a1
#define ARG_LIST2 a0,a1
	IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};

template<typename Arg0,typename Arg1,typename Arg2>
class Event3:public _EventBase<void(Arg0,Arg1,Arg2)>
{
public:
#define ARG_LIST1 Arg0 a0,Arg1 a1,Arg2 a2
#define ARG_LIST2 a0,a1,a2
	IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3>
class Event4:public _EventBase<void(Arg0,Arg1,Arg2,Arg3)>
{
public:
#define ARG_LIST1 Arg0 a0,Arg1 a1,Arg2 a2,Arg3 a3
#define ARG_LIST2 a0,a1,a2,a3
	IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3,typename Arg4>
class Event5:public _EventBase<void(Arg0,Arg1,Arg2,Arg3,Arg4)>
{
public:
#define ARG_LIST1 Arg0 a0,Arg1 a1,Arg2 a2,Arg3 a3,Arg4 a4
#define ARG_LIST2 a0,a1,a2,a3,a4
	IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3,typename Arg4,typename Arg5>
class Event6:public _EventBase<void(Arg0,Arg1,Arg2,Arg3,Arg4,Arg5)>
{
public:
#define ARG_LIST1 Arg0 a0,Arg1 a1,Arg2 a2,Arg3 a3,Arg4 a4,Arg5 a5
#define ARG_LIST2 a0,a1,a2,a3,a4,a5
	IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3,typename Arg4,typename Arg5,typename Arg6>
class Event7:public _EventBase<void(Arg0,Arg1,Arg2,Arg3,Arg4,Arg5,Arg6)>
{
public:
#define ARG_LIST1 Arg0 a0,Arg1 a1,Arg2 a2,Arg3 a3,Arg4 a4,Arg5 a5,Arg6 a6
#define ARG_LIST2 a0,a1,a2,a3,a4,a5,a6
    IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3,typename Arg4,typename Arg5,typename Arg6,typename Arg7>
class Event8:public _EventBase<void(Arg0,Arg1,Arg2,Arg3,Arg4,Arg5,Arg6,Arg7)>
{
public:
#define ARG_LIST1 Arg0 a0,Arg1 a1,Arg2 a2,Arg3 a3,Arg4 a4,Arg5 a5,Arg6 a6,Arg7 a7
#define ARG_LIST2 a0,a1,a2,a3,a4,a5,a6,a7
    IMPLEMENT_OPERATOR
#undef ARG_LIST1
#undef ARG_LIST2
};



template<typename T>
class Event;

template<>
class Event<void()>:public Event0{};

template<typename Arg0>
class Event<void(Arg0)>:public Event1<Arg0>{};

template<typename Arg0,typename Arg1>
class Event<void(Arg0,Arg1)>:public Event2<Arg0,Arg1>{};

template<typename Arg0,typename Arg1,typename Arg2>
class Event<void(Arg0,Arg1,Arg2)>:public Event3<Arg0,Arg1,Arg2>{};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3>
class Event<void(Arg0,Arg1,Arg2,Arg3)>:public Event4<Arg0,Arg1,Arg2,Arg3>{};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3,typename Arg4>
class Event<void(Arg0,Arg1,Arg2,Arg3,Arg4)>:public Event5<Arg0,Arg1,Arg2,Arg3,Arg4>{};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3,typename Arg4,typename Arg5>
class Event<void(Arg0,Arg1,Arg2,Arg3,Arg4,Arg5)>:public Event6<Arg0,Arg1,Arg2,Arg3,Arg4,Arg5>{};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3,typename Arg4,typename Arg5,typename Arg6>
class Event<void(Arg0,Arg1,Arg2,Arg3,Arg4,Arg5,Arg6)>:public Event7<Arg0,Arg1,Arg2,Arg3,Arg4,Arg5,Arg6>{};

template<typename Arg0,typename Arg1,typename Arg2,typename Arg3,typename Arg4,typename Arg5,typename Arg6,typename Arg7>
class Event<void(Arg0,Arg1,Arg2,Arg3,Arg4,Arg5,Arg6,Arg7)>:public Event8<Arg0,Arg1,Arg2,Arg3,Arg4,Arg5,Arg6,Arg7>{};