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Setting Metatables Problem?
Why when I program using Metatables, and set 3 letters, access the main table then fire the function it only prints the first letter.
local tab={}
local meta={
__index=function(a,b,c)
rawset(a,b,c)
return'a','b','c'
end
}
setmetatable(tab,meta)
newtab=tab[1]
print(newtab) -- > a
When I try setting tab[2] or tab[3], it still prints a.
0
Metamethods in Lua 5.1 are limited to returning only 1 value; hence, 'b' and 'c' will not be returned unless, as xToonLinkX123 stated, you pack all values you want to return into an array. Goulstem 8144 — 9y
1 answer
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1
I think here you trying is to print a, b and c. I don't know if it was the self of the table the key and the value but whatever I write the other thing you can do, enjoy !
I change something but you can change it back and if you want to learn more with metatables, just go one wiki here
soo here the code for printting all thing:
local meta={
__index=function(a, b, c)
--rawset(a, b, c) -- not need to do this they are already set.
return {'a', 'b', 'c'}
end
}
local tab = setmetatable({}, meta)
newtab = tab[1]
print(table.concat(newtab, ', '))-- a, b, c
--or print(newtab[1]) --> a
--or print(newtab[2]) --> b
--or print(newtab[3]) --> c
or if you want to see what is the table Adress they key and the value of the table, do this:
local meta={
__index=function(self, key, value)
--rawset(self, key, value) -- not need to do this they are already set.
return {self, key, value}
end
}
local tab = setmetatable({}, meta)
newtab = tab[1]
print(newtab[1], newtab[2], newtab[3]) -- 3 will be nil because no value is setting