Re: [proposal] close file on io.lines("filename", "*a")()
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- Subject: Re: [proposal] close file on io.lines("filename", "*a")()
- From: Sean Conner <sean@...>
- Date: 2019年7月30日 13:12:11 -0400
It was thus said that the Great Soni They/Them L. once stated:
> since lua doesn't have refcounting and some ppl wanna do basically
> io.open(file):read("*a") I wanna propose io.lines("filename", "*a")()
> (or alternatively io.lines("filename", "*a", "*l")) should close the
> file as if the iterator ran out.
Lua 5.4 already does that.
[spc]lucy:/tmp>lua-54
Lua 5.4.0 Copyright (C) 1994-2019 Lua.org, PUC-Rio
> print(io.lines("tabs"))
function: 0x8b39900 nil nil file (0x8b410f8)
That final value marks the descriptor for closing when the iterator is
done. If you want to automatically close the file after reading the
contents:
local data do
local <toclose> f = io.open(myfile)
data = f:read("a")
end
-- f is closed, and data has the contents.
-spc