Re: Is this Lua table an array?

[David Jones <drj@...>]

On 4 Oct 2006, at 19:26, Sam Roberts wrote:

> > The 'pairs' mechanism is easy enoug to use in Lua code. I'm just
> > wondering if there's a good way of doing the same from C.
>
> See
>
> 	http://www.lua.org/manual/5.1/manual.html#lua_next
>
> Be VERY careful not to modify the key during traversal. In particular,
> lua_isnumber() and lua_isstring() modify their args, or at least they
> did in 5.0, I don't see specific mention of this in:
>
> 	http://www.lua.org/manual/5.1/manual.html#lua_isstring

lua_isnumber and lua_isstring never did modify their arguments, but  
lua_tostring does.  In 5.0 and 5.1, with its current interface  
lua_tostring _has_ to modify the stack argument in order to keep the  
GC happy.

drj