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What is newproxy and how is it useful?

Asked 541 views1 answers

I was messing around with Lua yesterday and stumbled upon the 'newproxy' function.

http://wiki.roblox.com/index.php?title=Function_dump/Basic_functions#newproxy

I kind of understand it, but I'm not sure how it is useful. I know it creates a blank userdata object with a metatable attached (if the argument is true).

How it newproxy useful? Here is an example of what I did while messing around with it:

local proxy = newproxy(true)
local metatable = getmetatable(proxy)

metatable.__index = function(array, key) print(array, key) end

local y = proxy[100]

--[[
	OUTPUT:
		userdata: 0x443ad4b4 100
]]
Anonymous

1 answer

✓ Accepted answer

Proxies in this regard appear to just be empty Tables with another empty Table set as its metatable, assigned as a 'userdata' (I.e. a C-level data construct) instead of a Table.

I'm using this as reference, since as that page says, newproxy is undocumented.

EDIT: Basically, turning a Table into an Object, sorta.

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