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Am 21.06.19 um 00:16 schröbte Soni "They/Them" L.:
local function do_something_with_file(f)
local <with> f = f -- f:__enter()
f:write("hello!\n")
-- f:__close()
end
You shouldn't dispose objects you didn't allocate in any Lua version because the code that did allocate the object might still need it after you have returned. And that makes <toclose>/<with> nesting superfluous.
do_something_with_file(io.open("foo", "w")) -- okay, file gets closed
local <with> f = io.open("bar", "w") -- f:__enter()
do_something_with_file(f) -- doesn't close file
f:write("goodbye!\n")
-- f:__close() -- file gets closed
I was thinking about this:
local f = io.open("bar", "w")
do_something_with_file(f) -- closes file
f:write("goodbye!\n") -- error
Philipp