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Is it possible? If so, I beg your help.
Sorry for my poor english.
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Scripts How to use address?
How to use address?
20 repliesIs it possible? If so, I beg your help.
Sorry for my poor english.
Something like this in c++
int address = 20;
cout << "This is the address of that variable: " << &address;
Infinite Rain: . I don't need table serialization... I need something like this output:1
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mytable={"foo","bar","lua"}
tostring(mytable) -- returns "table:12345"
table_toaddress(mytable) -- returns 12345
address_totable(12345) -- returns mytable
mytable = nil
address_totable(12345) -- returns nil
Only this is possible to do:
table_toaddress(mytable)
Hostagessy: I'm aware of this, and don't think this would be an issue, I only need the addresses for the present-time being, like, for navigation. So, the randomness thing for the addresses woudn't affect my objectives, if this woudn't be for saving things.But thanks for helping anyway.
Do you want to encrypt/archive stuff in any way? As I understood, you only care about the contents of the target table.
Ok for example I have table of elements called "myTable". And I get its address via tostring(myTable). Output would be something like: "0x4801c890" and if you know its address you can use it like that:
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print(0x4801c890[1])
Basically you can use its address as if it was a name of the table/function. In our case codes
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print(0x4801c890[1])
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print(myTable[1])
But using its address instead of the name is pointless because they change every run, that means that the only way to know it would be storing its address in a string variable and execute it via the loadstring(s) command, but again, why the fuck would you ever want do that.
edited 9×, last 19.11.14 12:04:12 pm
If you want to save the reference to a table you can simply do:
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mytable = {2, 4, 6} -- create a table
tmp = mytable -- create a variable which points to that table. This WON'T copy the table!
tmp = {1, 3, 5} -- change mytable using tmp
'mytable will now contain {1, 3, 5} (and tmp as well as it is the same table in the memory)
In the sample above "tmp" behaves like the address/pointer/reference of "mytable".
There is no need to access the address of tables in Lua manually. I think that you're doing something wrong if you want to do that.
Admin/mod comment
§2.2 - Only meaningful contributions with added value 1
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print(mytable,tmp) for k,v in pairs(mytable) do print(k,v) end
Well, maybe i didn't understand something.
useigor if you do that, you will have two variables pointing to the same source (table). You can only create a full copy by doing pairs() on the source table.1
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source = {4,7,2}
alternative = {}
for k, v in pairs(source) do
alternative[k] = v
end
DC has written1
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tmp = mytable -- create a variable which points to that table. This WON'T copy the table!
tmp = {1, 3, 5} -- change mytable using tmp
You are right. What I wrote is obviously wrong. useigor and DCThe tmp table points to mytable as long as you DON'T REDEFINE IT:
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tmp = {1,10,20}
I gotta keep that in mind too
mozilla1) want to do is not possible in normal lua(unedited source code). The address is just for debugging puprose. It also does not make sense, why you want to use address? why you not use variable instead(like DC, useigor, and VADemon) said?Please note that Lua does have garbage collection which destroys the object when it doesn't needed. Example
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temp={1,2,3,4,5}
print(temp) -- table: 0xFFFFFFFF
temp=nil -- now table with address FFFFFFFF is destoryed by lua
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void print_object(lua_State* L,int n) {
printf("%s: %X",lua_typename(L,n),lua_topointer(L,n));
}
lua_topointer has written
Converts the value at the given acceptable index to a generic C pointer (void*). The value can be a userdata, a table, a thread, or a function; otherwise, lua_topointer returns NULL. Different objects will give different pointers. There is no way to convert the pointer back to its original value.
Typically this function is used only for debug information.
Typically this function is used only for debug information.
@
VADemon: It also apply for coroutine(thread), userdata, and function. 
MikuAuahDark: So, that's really not possible to convert back to its original value...
Okay, thanks for the enlightment anyway.
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function table_toaddress(t) return tostring(t):sub(8) end
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function table.lookup(address)
local address_found={}
function lookup(n,t,a)
if value_found then return end
a = a or {}
if type(t) =="table" then
if a[t] then
return
else
if tostring(t)==address then
address_found=t
return
else
a[t] = true
for k,v in pairs(t) do
lookup(k,v,a)
end
end
end
end
end
lookup("_G",_G)
return address_found
end
mozilla1: that's apply only for tables that stored in global variable. What about tables that placed in regstry variable or in another table? you won't get the table.