RE: Finding the version

["Luiz Carlos Silveira" <luiz@...>]

> Is there a way of finding the version of Lua one is running?
> The obvious way
> to overcome the bug (if that's what it is) in tinsert that I
> just pointed
> out is to write a wrapper:
>
> function tinsert(t, n, v)
>   %tinsert(t, n, v)
> end
>

Be careful: to correctly implement tinsert in Lua using the C tinsert you must pass the correct number of parameters to the C
function, like in

function tinsert(t, n, v)
	if (v) then
		%tinsert(t, n, v)
	else
		%tinsert(t, n)
	end
end

or the C tinsert will always think you are passing 3 parameters, even if the last is nil.

Lua 4.0  Copyright (C) 1994-2000 TeCGraf, PUC-Rio
> t = {}
> tinsert(t, 3)
> print(t[1])
3
> function tinsert(t, n, v) %tinsert(t, n, v) end
> t = {}
> tinsert(t, 3)
> print(t[1])
nil
> print(t[3])
nil
> t[3]=1
> tinsert(t, 3)
> print(t[3])
nil
> print(t[4])
nil
>