add begin/end in ObjectList

inc/hgl/type/List.h

@@ -214,6 +214,11 @@ namespace hgl
 //      virtual T *     CreateObject(){return(new T);}                                              ///<创建一个数据
         virtual void    DeleteObject(T *obj){if(obj)delete obj;}                                    ///<删除一个数据
 
+    public:
+
+        T **begin()const{return this->items;}
+        T **end()const{return this->items+this->count;}
+
     public:
 
         virtual ~ObjectList()