RE: table.remove in C api?

[Jonathan Castello <solugon@...>]

If I recall correctly, there is no difference between a key with a 'nil' value, and a nonexistent key.

> Date: Fri, 21 Aug 2009 21:03:31 +0100
> From: c.camacho@ntlworld.com
> To: lua@bazar2.conectiva.com.br
> Subject: Re: table.remove in C api?
>
> > in C, use lua_pushnil() and lua_settable() or lua_rawset()
>
> Will that collect the key or could I end up with a large table of
> nil values ? (just checking!)
>
> and although unlikely what would happen if I wanted a table that
> contained nil values ie is nil some special construct and not just zero
> (again just need to be sure I understand what's happening)
>
> Thanks
> Chris
>
>
> Javier Guerra wrote:
> > On Fri, Aug 21, 2009 at 2:47 PM, Chris Camacho<c.camacho@ntlworld.com> wrote:
> >
> >> I have a table indexed by pointers (lightuserdata) with userdata values
> >> to allow me to look up pointers and return userdata to Lua
> >>
> >> However in the userdata's __gc method I need to remove the
> >> pointer key from the table, there seems to be no analogue of
> >> table.remove(t,i) in lua's C api - or am I missing something obvious
> >>
> >
> > table.remove(t [,pos]) is handy for working with the array part of a
> > table, not the hash part where you're storing your userdatas (since
> > they're indexed by lightuserdatas and not small consecutive indexes).
> >
> > for the hash part, simply assign nil: t(yourlightuserdata)=nil
> >
> > in C, use lua_pushnil() and lua_settable() or lua_rawset()
> >
> >
>
>
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