Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors
[
Date Prev][
Date Next][
Thread Prev][
Thread Next]
[
Date Index]
[
Thread Index]
- Subject: Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors
- From: Sergey Kovalev <kovserg33@...>
- Date: 2019年6月25日 20:49:24 +0300
Can this code solve auto close problem https://pastebin.com/LPxHKKp8
-- helper function
function scope(self)
local result
self=self or {}
self.list={}
self.error=self.error or error
local function auto(arg,close,msg)
if arg then
table.insert(self.list,{ arg=arg, fn=close or io.close })
else
self.error(msg or "init error",2)
end
return arg
end
if self.init then self.init(auto) end
local ok,err=pcall(function() result=table.pack(self.body()) end)
if self.done then self.done(ok,err) end
for _,close in pairs(self.list) do close.fn(close.arg) end
if not ok then self.error(err) end
return table.unpack(result)
end
-- usage:
function test()
local src,dst
scope {
init=function(auto)
src=auto(io.open("file1.txt","w"))
dst=auto(io.open("file2.txt","w"),function(f) print "close
file" f:close() end )
end,
body=function()
src:write "hello"
dst:write "world"
end,
}
end
test()
вт, 25 июн. 2019 г. в 20:31, Francisco Olarte <folarte@peoplecall.com>:
>
> Sergey:
>
> On Tue, Jun 25, 2019 at 6:25 PM Sergey Kovalev <kovserg33@gmail.com> wrote:
> > __unreference should call immediately when reference count to zero,
> > unliket __gc it is called latter then there is no way to stand more or
> > when explicitly call collectgarbage()
>
> Lua does not work by reference count.
>
> OTOH, <toclose> is really handy to implement your own ref-count
> schemes, I'm planning to use it for that if I ever switchto 5.4.
>
> Francisco Olarte.
>
- References:
- Lua 5.4.0-alpha-rc1 behavior with closing methods errors, phlnc8
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, David Heiko Kolf
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, Francisco Olarte
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, David Heiko Kolf
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, Francisco Olarte
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, David Heiko Kolf
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, Francisco Olarte
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, Sergey Kovalev
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, Matthew Wild
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, Sergey Kovalev
- Re: Lua 5.4.0-alpha-rc1 behavior with closing methods errors, Francisco Olarte