Can a class return a value?

MoKaLux · February 2020

I need some explanation please.

PLAYER1 = Core.class()
function PLAYER1:init()
	local obj = 1
	return obj
end

Why does this return a table instead of 1? Is it due to init?
Thank you for your help giderians

.

rrraptor · February 2020

See class function here:
https://github.com/gideros/gideros/blob/master/luabinding/property.lua

You need to change it like that in order to get what you want:

do
	local c = Object
	c.__index = c
	c.__new = function(...)
		local s1 = {}
 
		setmetatable(s1, c)
 
		local init = rawget(c, "init")
		if type(init) == "function" then
			init(s1, ...)
		end
 
		return s1
	end
 
	c.new = function(...)
		local s1 = c.__new(...)
 
		local postInit = s1.postInit
		if type(postInit) == "function" then
			postInit(s1, ...)
		end
 
		return s1
	end
end
 
local __Object = Object
 
MyClass = function (b,a)
	if a then
		assert(type(a)=="function","Second argument to Core.class() should be a function or null")
	end
	b = b or __Object
 
	local c = {}
	c.__index = c
	setmetatable(c, b)
 
	c.super = b
 
	local v
	c.__new = function(...)
		local b = getmetatable(c)
		local s1
		if a then
		  s1 = b.__new(a(...))      
		else
		  s1 = b.__new(...)
		end
 
		setmetatable(s1, c)
 
		local init = rawget(c, "init")
		if type(init) == "function" then
			v = init(s1, ...)
		end
 
		return s1, v
	end
 
	c.new = function(...)
		local s1 = c.__new(...)
		local postInit = s1.postInit
		if type(postInit) == "function" then
			v = postInit(s1, ...)
		end
 
		return s1,v
	end
 
	return c
end
 
local test = MyClass(Sprite)
 
function test:init()
	local a = 3123
	return a
end
 
local instance, v = test.new()
print(instance, v)

The question is. Why you cant just attach this variable to "self"?

---test.lua file
local ASD = 49864
 
test = Core.class()
function test:init()
	self.ASD = ASD
end
 
-- main.lua file
local obj = test.new()
print(obj.ASD)

hgy29 · February 2020

@MoKaLux, can you explain what you are trying to achieve ?

MoKaLux · February 2020

thank you for your feedback.
I wanted to have access to obj and obj.body inside the init.
I can have access to those this way:

PLAYER1 = Core.class()
 
function PLAYER1:init(xworld, xobjpath, xobjname)
	self.obj = loadObj(xobjpath, xobjname) -- returns a sprite
	self.obj.body = xworld:createBody(self.obj:getMatrix())
--	return self.obj, self.obj.body -- that doesn't work!
end
 
function PLAYER1:get()
	return self.obj, self.obj.body -- that works
end
 
-- in the main
local player1x = PLAYER1.new(world, "path", "name.obj")
local player1, player1body = player1x;get()

Is it good or bad?

rrraptor · February 2020

PLAYER1 = Core.class()
 
function PLAYER1:init(xworld, xobjpath, xobjname)
	self.obj = loadObj(xobjpath, xobjname)
	self.body = xworld:createBody(self.obj:getMatrix())
end
-- in the main
local player1 = PLAYER1.new(world, "path", "name.obj")
player1.obj
player1.body

?

MoKaLux · February 2020

thank you very much rrraptor, yes that's the answer I was looking for

very much appreciated

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