#luaobject ###Description A lua package for object-oriented programming, supports the following properties:
1.Class includes read-only elements and read-write elements,read-only elements can not be overridden(include sub class),read-write elements can be overridden(include sub class).
2.Class supports multiple inheritance,A class can also inherit class1 and class2,access the parent class through the super[index],the read-write elements of parent class can be overridden from sub class.
3.Support inheritance chain(A inherit B,B inherit C,C inherit D,and so on).
4.Support objects batch release,if object1,object2,object3 inherit Class1,release Class1,will release object1,object2,object3 automatic.
5.Support single object element definition.
6.Support bind event, event can be inherited.
7.Support multicast event handler,handler can have a different number of parameters(the first parameter is always sender).
8.Not support cross inheritance.

###Example ####example 1 Define a Person class and create the object, print the variable id, and then release the object #####methon 1

local Person=Class:create()    --declara class
Person.inherit={Object}     --inherit Object
Person.readonly={id=1,tostring=function(s) print(s) end}      read-only element,can not be override,can be inherited
Person.override={name="person",getvalue=function(v) return v end}   --can be override,can be inherited
person=Person:new()
print(person.id)
person:release()

#####methon2

local Person=Class:create({inherit={Object},readonly={id=1},override={name="person"}})
person=Person:new()
print(person.id)
person:release()

####example 2 Release all objects that be generated from Person

local Person=Class:create()
Person.inherit={Object}
Person.readonly={id=1,tostring=function(s) print(s) end}
Person.override={name="person",getvalue=function(v) return v end}
person1=Person:new()
person2=Person:new()
person3=Person:new()
Person:abandon()

####example 3 Access parent class elements

local Person=Class:create()
Person.inherit={Object}
Person.readonly={id=1,tostring=function(s) print(s) end}
Person.override={name="person",getvalue=function(v) return v end}
person=Person:new()
print(person.super.id) 

####example 4 Access to the parent element by index

local Person=Class:create()
Person.inherit={Object1,Object2}
Person.readonly={id=1,tostring=function(s) print(s) end}
Person.override={name="person",getvalue=function(v) return v end}
person=Person:new()
person.super[2].tostring()

####example 5 Define the event, binding event handler, and trigger events

local Person=Class:create()
local Event=require "event"
print_event=Event:new()
Person.event={print_event}
function p(sender,args) 
    print(args) 
end
person=Person:new()
person.event(print_event):bind(p)
person.event(print_event):fire(2)

####example 6 Define the object event, binding event handler, and trigger events

local Person=Class:create()
local Event=require "event"
print_event=Event:new()
function p(sender,args) --the first parameter is always sender
    print(args) 
end
person=Person:new()
person.event:register(print_event)
person.event(print_event):bind(p)
person.event(print_event):fire(2)

####example 7 multicast event handler

local Person=Class:create()
local Event=require "event"
print_event=Event:new()
function p1(sender,args1) 
    print(args2) 
end
function p2(sender,args1,args2) 
    print(args1,args2) 
end
person=Person:new()
person.event:register(print_event)
person.event(print_event):bind(p1)
person.event(print_event):bind(p2)
person.event(print_event):fire(2)
person.event(print_event):fire(1,2)

####example 8 event can be inherited

local Class=require "class"
local Event=require "event"
local Person=Class:create()
print_event=Event:new()
Person.event={print_event}
local Man=Class:create({inherit={Person}})	--man inherit Person,so inherit print_event
function p(sender,args) 
    print(sender,args) 
end
person=Person:new()
man=Man:new();
person.event(print_event):bind(p)
man.event(print_event):bind(p)
person.event(print_event):fire(1)
man.event(print_event):fire(2)

out:
table: 0x4037a060 1 result of the person
table: 0x4036cd40 2 result of the man
You can see the two event sender points to a different event object.

###Api Class.inherit={parent class}
Class.readonly={read-only elements}
Class.override={read-write elements}
Class.event={events}
Class:create([inherit],[readonly],[override],[event]) create Class
Class-->NewClass
NewClass:new() create object
NewClass:abandon() release all object
Class-->object
object:register(event) register the object event
object:remove(event) remove the object event
object:release() release this object
object:copy() deep copy object
object.event(event):bind(handler) event bind handler
object.event(event):unbind(handler) event unbind handler
object.event(event):fire(sender,args) fire event