Re: Some small requests for the next release

[Rici Lake <lua@...>]

On 1-Mar-05, at 8:41 AM, Roberto Ierusalimschy wrote:

> What is wrong with the following code?
>
>   math.nan = 0/0
>   math.inf = 1/0

If you've compiled Lua with integer Numbers rather than floating point 
ones, this will crash and burn, probably.

Personally, I think NaN should coerce to a boolean false; that would be 
much cleaner. (In fact, since NaN is not available as a table key, 
there is a good argument for just turning NaN's into nil).

>   math.isnan = function (x) return x ~= x end
>   math.isnotnan = ...     -- beware: this one may be patented already 
> ;)
>
> Put that in a file `nan.lua' and just say `require "nan"´.