On Saturday 15 November 2008, Geoff Richards wrote:
> You can use the Lisp 'with-open-file' trick. Write a wrapper function
neat, haven't thought of that. a more general trick would be an 'after'
wrapper:
function after (a, b)
local ok, result = pcall (a)
b()
assert (ok, result)
return result
end
and use like this:
after (function()
-- do whatever you want
end, function ()
-- close any acquired resources
end)
a similar result to try...finally... on some languages. the bad part is that
each function is a different scope, so the resources can't be local to the
first one, or won't be seen on the second. maybe there's some trick
yield()ing the second function just after acquiring resources... hm... sounds
doable, maybe even worthwhile :-)
--
Javier
You can always use do...end blocks to scope things the way you like it.
do
-- Set up shared resources here...
local this, that, etc
after (function()
-- do whatever you want
end, function ()
-- close any acquired resources
end)
end
