Re: [Lua5.2] __len meta-method has two operand?

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

2011/10/13 Roberto Ierusalimschy <roberto@inf.puc-rio.br>:
>> I have modified my code to support this undocumented 'feature'.
>
> It is not undocumented (although it is not listed in the incompatibility
> section):
>
>  http://www.lua.org/work/doc/manual.html#2.4
>
>  For the unary - and # operators, the metamethod is called with a
>  dummy second argument. This extra argument is only to simplify Lua's
>  internals; it may be removed in future versions and therefore it is
>  not present in the following code. (For most uses this extra argument
>  is irrelevant.)
>
> -- Roberto
>
>

Sorry, my bad :-(

anyway, very thank you for your help and document :-)