Re: Possible Lua enhancements (mostly for private data)
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- Subject: Re: Possible Lua enhancements (mostly for private data)
- From: "Matthew Wild" <mwild1@...>
- Date: 2008年12月18日 22:01:24 +0000
On Thu, Dec 18, 2008 at 2:26 AM, David Manura <dm.lua@math2.org> wrote:
> On Wed, Dec 17, 2008 at 4:33 PM, Mark Hamburg wrote:
>> So, now we can write:
>> label _angle, _radius
>> function Point( x, y )
>> return {
>> _angle = math.atan2( y, x ),
>> _radius = math.sqrt( y * y + x * x ),
>> coordinates = function( self )
>> return self._radius * math.cos( self._angle
>> ), self._radius * math.sin( self._angle )
>> end
>> }
>> end
>
> You can achieve a similar effect with "inside-out objects"[1-2] via
> Lua's support for weak keys.
I'm probably missing something, but why use this method and not
closures? That is, why not define "angle" and "radius" as upvalues,
along with "self"?
Matthew.