Re: Next Version of Lua?
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- Subject: Re: Next Version of Lua?
- From: Peter Cawley <lua@...>
- Date: 2009年6月10日 13:44:26 +0100
On Wed, Jun 10, 2009 at 1:38 PM, steve donovan<steve.j.donovan@gmail.com> wrote:
> On Wed, Jun 10, 2009 at 1:59 PM, Luiz Henrique de
> Figueiredo<lhf@tecgraf.puc-rio.br> > > setmetatable(t,{
>> __call = function (x,y,z) return next(x,z) end
>> })
>>
>> for k,v in t do print(k,v) end
>>
>> No parentheses needed.
>
> That is actually rather cute, but how would you do that for an
> ipairs-style iterator?
t = {"hello", "world", "from", "Lua"}
setmetatable(t, {__call = function(t,v,i)
i = (i or 0) + 1
v = t[i]
if v then return i, v end
end})
for k, v in t do print(k, v) end
--> 1 hello
--> 2 world
--> 3 from
--> 4 Lua