CMCore/inc/hgl/platform/compiler/EventFunc.h

#ifndef HGL_EVENT_FUNC_INCLUDE
#define HGL_EVENT_FUNC_INCLUDE

#include<hgl/type/_Object.h>
#include<string.h>
namespace hgl
{
    #ifdef __BORLANDC__

        #define SetEventCall(event_obj,obj_this,class_name,event_func)  event_obj=obj_this->class_name::event_func
        #define SafeCallEvent(event_obj,intro)                          {if(event_obj)event_obj intro;}
        #define CallEvent(event_obj,intro)                              event_obj intro
        #define DefEvent(result,name,intro)                             result (__closure *name)intro

    #else

        template <typename RT,typename Func> struct EventFunc
        {
            typedef EventFunc<RT,Func> SelfClass;

            union
            {
                void *vp_this;
                _Object *this_pointer;
            };

            union
            {
                void *vp_func;
                Func func_pointer;
                ObjectMemberFunc omf;
            };

        public:

            EventFunc()
            {
                ClearFunc();
            }

            EventFunc(void *t,void *f)
            {
                ClearFunc();

                vp_this=t;
                vp_func=f;
            }

            void ClearFunc()
            {
                memset(this,0,sizeof(SelfClass));
            }

            bool operator !()const
            {
                if(!vp_func)return(true);

                return(false);
            }

            void operator = (void *v)
            {
                if(v==0)
                    memset(this,0,sizeof(SelfClass));           //omf可能不止一个指针的长度，所以必须这样清
            }

            void operator = (const SelfClass &ef)
            {
                memcpy(this,&ef,sizeof(SelfClass));
            }

            bool operator == (void *v)
            {
                return(vp_func==v);
            }

            bool operator != (void *v)
            {
                return(vp_func!=v);
            }

            template<typename ...ARGS>
            RT operator()(ARGS...args)
            {
                return (this_pointer->*(func_pointer))(args...);
            }

            template<typename ...ARGS>
            RT operator()(ARGS...args)const
            {
                return (this_pointer->*(func_pointer))(args...);
            }

            template<typename ...ARGS>
            RT ThisCall(void *tp,ARGS...args)
            {
                return (((_Object *)tp)->*(func_pointer))(args...);
            }

            template<typename ...ARGS>
            RT ThisCall(void *tp,ARGS...args)const
            {
                return (((_Object *)tp)->*(func_pointer))(args...);
            }
        };//template<typename RT,typename Func> struct EventFunc

        template<typename Func> struct EventFunc<void,Func>
        {
            typedef EventFunc<void,Func> SelfClass;

            union
            {
                void *vp_this;
                _Object *this_pointer;
            };

            union
            {
                void *vp_func;
                Func func_pointer;
                ObjectMemberFunc omf;
            };

        public:

            EventFunc()
            {
                memset(this,0,sizeof(SelfClass));
            }

            EventFunc(void *t,void *f)
            {
                memset(this,0,sizeof(SelfClass));

                vp_this=t;
                vp_func=f;
            }

            bool operator !()const
            {
                if(!vp_func)return(true);

                return(false);
            }

            void operator = (void *v)
            {
                if(v==0)
                    memset(this,0,sizeof(SelfClass));           //omf可能不止一个指针的长度，所以必须这样清
            }

            void operator = (const SelfClass &ef)
            {
                memcpy(this,&ef,sizeof(SelfClass));
            }

            bool operator == (void *v)
            {
                return(vp_func==v);
            }

            bool operator != (void *v)
            {
                return(vp_func!=v);
            }

            template<typename ...ARGS>
            void operator()(ARGS...args)
            {
                (this_pointer->*(func_pointer))(args...);
            }

            template<typename ...ARGS>
            void operator()(ARGS...args)const
            {
                (this_pointer->*(func_pointer))(args...);
            }

            template<typename ...ARGS>
            void ThisCall(void *tp,ARGS...args)
            {
                (((_Object *)tp)->*(func_pointer))(args...);
            }

            template<typename ...ARGS>
            void ThisCall(void *tp,ARGS...args)const
            {
                (((_Object *)tp)->*(func_pointer))(args...);
            }
        };//template<void,typename Func> struct EventFunc

        #define SetEventCall(event_obj,obj_this,class_name,event_func)  {   \
                                                                            event_obj.vp_this=obj_this; \
                                                                            event_obj.vp_func=GetMemberFuncPointer(class_name,event_func);  \
                                                                        }

        #define SetEventThis(event_obj,obj_this)            event_obj.vp_this=obj_this;

//      #define CallEvent(event_obj,intro)                  ((event_obj.this_pointer->*(event_obj.func_pointer))intro)

        #define SafeCallEvent(event_obj,intro)              {if(event_obj.vp_func)event_obj intro;}

        #define DefEvent(result,name,intro)                 EventFunc<result,result (_Object:: *)intro> name;

    #endif//__BORLANDC__

    /*

    使用方法:

        class Example
        {
            //原Borland/CodeGear方式
            void (__closure *OnClick)(Object *);

            //现通用方式
            DefEvent(void,OnClick,(Object *));
        };

        void Test::ClickProc(Object *);

        void Test::func()
        {
            Example *exp;

            {
                //原Borland/CodeGear方式
                exp->OnClick=this->ClickProc;
                或
                exp->OnClick=ClickProc;

                //现通用方式
                SetEventCall(exp->OnClick,this,Test,ClickProc);
            }

            {
                //原Borland/CodeGear方式
                exp->OnClick(nullptr);

                //现通用方式
                CallEvent(exp->OnClick,(nullptr));

                //C++11方式
                exp->OnClick(nullptr);
            }
        }

    */
}//namespace hgl
#endif//HGL_EVENT_FUNC_INCLUDE