A stupid question
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- Subject: A stupid question
- From: Enrico Colombini <erix@...>
- Date: 2008年3月31日 18:47:02 +0200
I'm a bit ashamed of this question, but my ideas are somewhat confused
on this matter. Suppose I have this code:
---
t = {}
do
local a = 5
function t.dbl()
a = a * 2
print(a, _G.a)
end
function t.inc()
a = a + 1
print(a, _G.a)
end
end
t.dbl() --> 10 nil
t.inc() --> 11 nil
---
So both functions share the same 'a', as expected, and this 'a' is not
global (again, as expected).
The first question is: where is 'a' located? Do both functions share 'a'
as an upvalue? If so, how can they hold a reference to a simple value
(as opposed, for example, as to a table)?
The second question, which prompted me to ask, is: if I remove both
functions:
t = {}
does 'a' get collected at gc? (assuming there are no other reference to it)
Enrico