How can I implement the new __iter function to my proxy table?

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#21

I don’t believe so. What you could do is replace .insert and those functions and before inserting you could send a third argument

insert = function(t, v, i)
	if(type(t) == "userdata") then
		getmetatable(t).__newindex(t,i,v,true);
	else
		table.insert(t,v,i)
	end;
end;
#22

That’s awesome but I personally would not use these kind of methods in production as it’s a hacky solution. I will probably go with adding .insert function as @HugeCoolboy2007 suggested, although I am probably gonna look for different solution to it as well because I want to avoid name collisions (eg. local tbl = proxify({ insert = "cool" }) ).

I could make a module like ptable (proxy table) to avoid overwriting global built-in functions.

local ptable = {}

function ptable.insert(tbl, value, index)
	getmetatable(tbl).__newindex(tbl, index, value, true)
end

return ptable

Also, could you explain what is going on with the .__newindex(...), what is that true for?

#23

Fixed so that you don’t need to use getfenv
New example.rbxm (6.4 KB)

You just need to paste this when requiring

local Proxy = require(script.Parent.Proxy);

local getmetatable = Proxy.getmetatable;
local setmetatable = Proxy.setmetatable;
local ipairs = Proxy.ipairs;
local pairs = Proxy.pairs;
local rawget = Proxy.rawget;
local rawset = Proxy.rawset;
1 Like
#24

It is the same you did.

#25

same what?

I did what? Could you elaborate more on this?

#26

I believe I solved the issue with name collision, I changed the __index meta method to this:

meta.__index = function(self, key)
		local idx = tbl[key] or internalMethods[key]
		local tableMethod = table[key]
		
		if idx and type(idx) == "table" then
			idx = proxify(idx)
		end
		
		return idx or (tableMethod and function(...)
			return tableMethod(tbl, ...)
		end) or nil
	end

If the key exists on the table first, then the key value from the will be returned, otherwise it will search the internalMethods table and do the same thing. If it doesn’t exist in either of the tables, then it will search the table global for the key and return a function that runs the built-in function from the global.

Code used:

Summary

For some, reason I can’t copy all of the code on mobile

tbl.insert("test") -- removed the "nil" argument
print(tbl[1])
for key, value in tbl.Modes do
	print(key, value)
end
3 Likes
#27

So you could do this:

__newindex = function(t,k,v, isService)
	if(isService) then print("Being required by table!") end;
end
1 Like
#28

You type fast! You are telling me that in mobile on 5min you could type all of that??

#29

Yea, I’m just really used to typing :sweat_smile:

1 Like
#30

Alright, one more question, how can I allow for printing my proxy table?

image

As currently it prints the memory address to it or whatever, and the __tostring method only accepts string as the return value.

#31

That is a complicated one. What you will need to do is a custom print that loops through the table and creates a copy of a real table to print it. Any other method requires too much work, and it is just better to allow roblox to display the table.

1 Like
#32

debug.getuservalue(userdata, n)
However that is unfortunately not native to Luau.

You can use native table values to track accesses/assignments to a table.
https://www.lua.org/pil/13.4.4.html

1 Like