Still struggling with table access tracking
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- Subject: Still struggling with table access tracking
- From: Florian Berger <fberger@...>
- Date: 2004年5月27日 15:00:24 +0300
Hi.
I am still trying to get tracking of table's access working. My previous
question is in here:
http://lua-users.org/lists/lua-l/2004-05/msg00120.html
I'm currently trying to add tracking to all new subtables in __newindex
metamethod:
local index = {}
local Access, Assign, TrackAll, mt
function TrackAll(t)
for k, v in pairs(t) do
if type(v) == 'table' then
TrackAll(v)
end
end
t = Track(t)
end
function Access(t, k)
print('*Access', tostring(t), tostring(k))
return t[index][k]
end
function Assign(t, k, v)
print('*Assign', tostring(t), tostring(k), tostring(v))
if type(v) == 'table' then
TrackAll(v)
end
t[index][k] = v
end
mt =
{
__index = Access,
__newindex = Assign
}
function Track(t)
local proxy = {}
proxy[index] = t
setmetatable(proxy, mt)
return proxy
end
A = {}
A = Track(A)
A.B =
{
C =
{
D =
{
E = 'E'
}
}
}
A.B.C.D.E = 'e'
--> *Assign table: 006F32C8 B table: 006F2088
--> *Access table: 006F32C8 B
But as you can see tracking is not working. When function "Assign" has
following form I get better results:
function Assign(t, k, v)
print('*Assign', tostring(t), tostring(k), tostring(v))
if type(v) == 'table' then
v = Track(v)
end
t[index][k] = v
end
--> *Assign table: 006F50B8 B table: 006F5138
--> *Access table: 006F50B8 B
--> *Access table: 006F3E88 C
When I modify function "Assign" like this:
function Assign(t, k, v)
print('*Assign', tostring(t), tostring(k), tostring(v))
if type(v) == 'table' then
v = Track(v)
for _k, _v in pairs(v) do
if type(_v) == 'table' then
_v = track(_v)
end
end
end
t[index][k] = v
end
--> *Assign table: 006F9EE8 B table: 006F9F68
--> *Access table: 006F9EE8 B
--> *Access table: 006F8B90 C
The results are still the same. So why can't I add tracking to subtables
in __newindex metamethod? Or why can't I use a function like in first
example?
floru