Re: Globals in 5.0 Alpha
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- Subject: Re: Globals in 5.0 Alpha
- From: John Belmonte <jvb@...>
- Date: 2002年8月17日 19:39:57 +0900
Peter Loveday wrote:
So, how does one use the new 'local global table' stuff ?
Here is my stab at modules in 5.0 using the new globals control. The
Lua team did a good job of reducing the complexity of the original
globals plan, and yet the result is still very powerful. There is no
longer a need to write out table dereferences everywhere just to
encapsulate things. I suppose classes will benefit equally well.
By the way, I can imagine adding some syntatic sugar for a namespace
support which handles the common case used below. Synopsis:
mymod = namespace
local val
function foo() ... end
.
.
.
end
-John
--------------------
-- define a module
local mod_init = function()
-- a private variable
local val
-- a public function
function foo(x)
val = x
end
function bar()
print(val)
end
end
local G = getglobals()
local mod_table = { }
setmetatable(mod_table,{ __index = G })
setglobals(mod_init, mod_table)
mod_init()
--return mod_table
-- or
--some_global = mod_table
--------------------
-- test
do
mod_table.foo(10)
mod_table.bar()
print(val, mod_table.val)
end
--
http:// i . /