RE: Static variables
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- Subject: RE: Static variables
- From: "Virgil Smith" <Virgil@...>
- Date: 2004年3月18日 15:05:42 -0600
Unless I'm mistaken, upvalues in Lua 5 are NOT read only.
If I am mistaken then someone will probably quickly correct me. :-)
Also, anyone with a compiler handy can check the code easily.
This means that you can accomplish the equivalent of static variables by
doing something like the following....
function MakeFoo()
local StaticA = 0 -- Declare/Initialize statics here
local StaticB = 0
return function(a,b)
...
print(StaticA, StaticB)
StaticA = StaticA + a
StaticB = StaticB + b
...
end
end
Foo = MakeFoo()
Foo(1,2)
Foo(1,2)
-----Original Message-----
From: lua-bounces@bazar2.conectiva.com.br
[mailto:lua-bounces@bazar2.conectiva.com.br]On Behalf Of Phil Bewig
Sent: Thursday, March 18, 2004 1:53 PM
To: lua@bazar2.conectiva.com.br
Subject: Static variables
I'm considering lua for a specific project. One of my needs is for static
variables that retain their value from one invocation of a function to the
next. In a quick reading of the manual section on variable scoping, I saw
no mention of static variables. Does lua provide static variables? Did I
miss something while reading the manual?
Many thanks,
Phil