Re: 5.2 _ENV garbage collection question

[Xavier Wang <weasley.wx@...>]

2011/6/27 steve donovan <steve.j.donovan@gmail.com>

On Mon, Jun 27, 2011 at 11:08 AM, Gaspard Bucher <gaspard@teti.ch> wrote:
> collectgarbage() ---- does not collect old "foo". Why ? Where is it stored ?
> print('end') -- the garbage collection after 'end' removes old "foo".

It's still there, as a global of the original environment.

steve d.

Yes! this version worked:

-- cc: cc='lua52'

local print = print

local collectgarbage = collectgarbage

local setmetatable = setmetatable

local gc_mt = {}

function gc_mt.__gc(obj)

  print('gc', obj.name)

end

_ENV = {}

foo = {name = 'foo'}

setmetatable(foo, gc_mt)

_ENV = {}

print(foo)     ---- nil as expected

print"first"

collectgarbage() -- collect here

print"second"

collectgarbage()

print('end') -- the garbage collection after 'end' removes old "foo".