Re: Assign idiom

["Leigh McRae" <leigh.mcrae@...>]

Actually I think your last one is really good.  I was also thinking of the 
multi-return idea but some of the code comes from C++ bindings.  So 
W_TextRegion() is a wrapper for my C++ class.  I didn't really want to 
change all my C++ code to suit lua.

 self.spName = W_TextRegion()

local sp = self.spName
sp:autoSize()
sp:setJustify( W_TextObject_Left )
sp:setFont( UI_Fonts.Comic_18 )
sp:anchor( W_Region_TopLeft, W_Region_TopLeft, self:getRegion( 
W_Region_Center ) )
self:addRegion( "FOREGROUND", sp )

 So I could the following:

function SetIdiom(tb, v)
   tb = v
   return v
end

local sp = SetIdiom( self.spBackGround, W_TextRegion() )

 Not bad, little hard on the eyes :)

----- Original Message ----- 
From: "Doug Rogers" <rogers@innocon.com>
To: "Lua list" <lua@bazar2.conectiva.com.br>
Sent: Thursday, March 08, 2007 12:58 PM
Subject: Re: Assign idiom


> Leigh McRae wrote:
>
> >   I am looking for something along the lines of:
> > local    sp = self.spBackGround = CreateSprite()
> > sp:setSize( 10, 10 )
>
> If setSize() returns the sprite, then:
>
>  self.spBackGround = CreateSprite():setSize(10, 10)
>
> It's hard to see a way to avoid a multiple assignment to capture to a
> local variable. Perhaps:
>
>  function dup(x) return x, x end
>
>  local sp
>  sp, self.spBackGround = dup(CreateSprite():setSize(10, 10))
>
> Looks like that one was already suggested! You might also try:
>
>  function self:set(k, v)
>     self[k] = v
>     return v
>  end
>
>  local sp = self:set('spBackGround', CreateSprite()):setSize(10,10)
>
> I think your original code is easier to read.
>
> Doug
>
> --
> Innovative Concepts, Inc. www.innocon.com 703-893-2007 x220