Re: table field init
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- Subject: Re: table field init
- From: Dirk Laurie <dirk.laurie@...>
- Date: 2017年9月27日 14:10:47 +0200
2017年09月27日 7:38 GMT+02:00 hz . <abrash_han@hotmail.com>:
> hi,
>
> Is there a way to init table field as:
>
> tbl = {
> a = ‘aaa’,
> b = a,
> }
>
> where b is inited as ‘aaa’?
>
> Or what’s the most simple approach to do this.
Simplicity is in the eye of the beholder. How about this?
tbl = let [[ a='aaa'; b=a ]]
It requires that the function 'let' be pre-written. That's not quite so
simple, but once done you have it. You can have any Lua code
inside that does not depend on local variables.
let = function(def)
local ans = {}
def = load(def,nil,nil,ans)
if def then
def()
return ans
end
end
The above version is semi-paranoid: it returns nil if your code
fails to compile. If your code compiles but does not run, it raises
an error.