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- Subject: RE: deleting tables from C
- From: virgil@... (Virgil Smith)
- Date: Wed, 5 Nov 2003 10:18:12 -0600
Isn't the "obvious" way to empty a table to...
key = next(table, nil)
if (key) then -- OK, lookup type checking to
-- ensure nil rather than false
table[key] = nil
until (not key) -- See previous comment
[mailto:firstname.lastname@example.org]On Behalf Of
Sent: Wednesday, November 05, 2003 9:38 AM
To: Lua list
Subject: RE: deleting tables from C
I found this reply a little confusing:
> If the table is a global, it is an entry in the global table,
> i.e. _G[<table_name>] = nil (You can use the pseudo-indices here or the
> legacy lua_setglobal macro)
> If the table is a local, you lua_setlocal()
The table isn't either a global or a local; it is an object in the heap.
Globals and/or locals can refer to the object.
When there are no references left to the object, the garbage collector
will deal with it.
So you "delete" a table or function by making sure that you do not
unnecessarily retain any references to it, and then it will go away
on its own accord.
A different question is "how do you empty a table?". This has come
up a few times on the list, and there doesn't seem to be a
satisfactory answer, although the need rarely arises and I did
at one point post a metamethod-based solution for the cases
when it does.