Am 28.12.2013 03:41 schröbte Sean Conner:
local mt =
{
__gc = function(u)
call_magic_cleanup_stuff()
setmetatable({},getmetatable(u))
end
}
setmetatable({},mt)
Doing this for Lua 5.1 is not quite as easy, as you need to use a userdata
object (say, a pointer to int) instead of a Lua table, but the concept is
the same.
Lua 5.1 had `newproxy` for that. E.g.:
local sentinel = newproxy and newproxy( true )
or setmetatable( {}, { __gc = true } )
getmetatable( sentinel ).__gc = function() writecache( c ) end
-spc
Philipp