Re: Bizarre behavior with debug.setupvalue() in Lua 5.3
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- Subject: Re: Bizarre behavior with debug.setupvalue() in Lua 5.3
- From: Paul K <paul@...>
- Date: 2015年3月28日 05:43:54 +0000
Hi Sean,
> I think what caught me up is that I haven't really played with Lua 5.2 (or Lua 5.3 until a few days ago) and I was still kind of expecting the Lua 5.1 behavior with setfenv(), which is a "local" change of a function's environment, and not the global change that happens now (because upvalues are pointers).
You can still keep it isolated if you want:
local meta
do
local _ENV = _ENV -- localize it as needed
meta = {
io = io,
tostring = tostring,
select = select,
print = function(...)
io.stdout:write("HERE I AM, JH ... ")
for i = 1 , select('#',...) do
io.stdout:write(tostring(select(i,...)),"\t")
end
io.stdout:write("\n")
end
}
end
print(debug.setupvalue(meta.print,1,meta),meta)
print(debug.getupvalue(meta.print,1))
This prints without errors under both Lua 5.2 and Lua 5.3:
_ENV table: 0092B810
_ENV table: 0092B810
Or is this not what you wanted in the first place?
Paul.