Iterate over vararg
[
Date Prev][
Date Next][
Thread Prev][
Thread Next]
[
Date Index]
[
Thread Index]
- Subject: Iterate over vararg
- From: Dirk Laurie <dirk.laurie@...>
- Date: 2018年12月20日 08:12:03 +0200
The task is to write an iterator factory 'args' so that
for k,v in args(...) do --[[whatever]] end
does the same as
for k=1,select('#',...) do local v = select(k,...) --[[whatever]] end
It is quite easy by using a table, of course:
~~~~
args = function(...)
local t = table.pack(...)
local n = t.n
local i = 0
return function()
i=i+1
if i<=n then return i,t[i] end
end
end
~~~~
It seems to be quite hard to do, even in the C API, without creating a
table. In fact, I have so far not succeeded.