It was thus said that the Great Dibyendu Majumdar once stated:
On 18 July 2018 at 17:19, Roberto Ierusalimschy <roberto@inf.puc-rio.br> wrote:
We had something (scope-qualified locals) that seemed to be enough.
Now we have this list of problems:
- It does not create a new scope by itself;
- It is not visible enough;
- It still does not solve the problem for global variables;
- It cannot supress exceptions.
Perhaps something simpler could be done? Such as ask a function to be
called on scope exit (normally or via exception) - similar to defer
statement in Go?
Then user code can do what it likes in that function - responsibility
of Lua ends with invoking the function.
It could be done now, although not automatically:
function hoover(...)
for i = 1 , select('#',...) do
local obj = select(i,...)
local mt = getmetatable(obj)
if mt and mt.__gc then
mt.__gc(obj)
end
end
end
do
local expensive = foo_user_obj()
local cheap = {}
local medium = setmetatable({},{ __gc = function(o) end })
