Re: Lua minus null (-0)
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- Subject: Re: Lua minus null (-0)
- From: Dirk Laurie <dpl@...>
- Date: Thu, 9 Jun 2011 17:53:06 +0200
On Thu, Jun 09, 2011 at 04:25:32PM +0200, Roberto Ierusalimschy wrote:
>
> Just to focus the discussion, the point is not about Lua being or not
> different from C, but about Lua being or not different from IEEE 754.
>
...
> Seriously, I do not see what is the big problem.
1. David Kastrup's example: [-0] and [0] are different keys, but you can't
have both in the same table.
2. [0/0] is a value, but not a legal table key in the current 5.1 and 5.2
Lua implementations.
> > NaN=0/0
> > t=table{[NaN]="Mary Poppins"}
> stdin:1: table index is NaN
> stack traceback:
> stdin:1: in main chunk
> [C]: in ?
This contradicts the reference manual:
> The type table implements associative arrays, that is, arrays that can
> be indexed not only with numbers, but with any value (except nil).
These points are either bugs that should be corrected, or quirks that should
be documented.
Dirk
- References:
- Re: Lua minus null (-0), Henk Boom
- Re: Lua minus null (-0), Dirk Laurie
- Re: Lua minus null (-0), Everett L Williams II
- Re: Lua minus null (-0), Dirk Laurie
- Re: Lua minus null (-0), David Kastrup
- Re: Lua minus null (-0), Dirk Laurie
- Re: Lua minus null (-0), David Kastrup
- Re: Lua minus null (-0), Dirk Laurie
- Re: Lua minus null (-0), David Kastrup
- Re: Lua minus null (-0), Roberto Ierusalimschy