Re: table.concat and __concat
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- Subject: Re: table.concat and __concat
- From: Sean Conner <sean@...>
- Date: Wed, 9 Sep 2015 18:01:54 -0400
It was thus said that the Great Soni L. once stated:
> Hello!
>
> Why does table.concat not respect __concat? I wanted to make it error
> with a custom error message.
mt = {}
function mt.__concat(a,b)
local r = {}
for n,v in pairs(a) do r[n] = v end
for n,v in pairs(b) do r[n] = v end
return r
end
a = { one = "1" , two = "2" , three = "3" }
b = { four = "4" , five = "5" , six = "6" }
c = a .. b
d = { "This is string 1" , "This is string 2" }
e = table.concat(d,"\n")
How do you propose the above code to work if table.concat() respected
__concat?
Besides, you can provide your own error code for table.concat():
local tc = table.concat
table.concat = function(list,sep,i,j)
local okay,ret = pcall(tc,list,sep,i.j)
if not okay then ... end
return ret
end
-spc