Re: How can I avoid changing the _ENV of a whole file when changing the _ENV of a lua function?

[Tom N Harris <telliamed@...>]

On 02/17/2012 03:53 AM, John Tan wrote:
> After trying such code I found that if I change the _ENV of a lua
> function, it will change the _ENV of whole file.
> I wonder if there is any way I can only change the _ENV of a certain
> lua function without affecting the other part of the script.
> THX in advance.

I believe what you want is lua_upvaluejoin. If you just change the 
value, then all other functions that share that upvalue will also be 
changed. lua_upvaluejoin changes the upvalue reference. The tricky part 
is that the new reference must also be the upvalue of another function.

[1] http://www.lua.org/manual/5.2/manual.html#lua_upvaluejoin

--
- tom
telliamed@whoopdedo.org