Re: A way to associate a Lua value with a FFI pointer?
- From: Richard Hundt <richardhundt@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 09 Apr 2014 11:14:38 +0200
On 4/9/14 11:09 AM, Daniel Kolesa wrote:
> Yes, a mapping table is always a possibility, I was hoping for some way
> to do it without this though. Also, I don't think you really need the
> tonumber() here. Indexing tables with cdata is fine here, as we want the
> key to be the address, the problem with cdata table indexes is just when
> doing something like, tbl[5LL] == tbl[5].
LuaJIT 2.0.3 -- Copyright (C) 2005-2014 Mike Pall. http://luajit.org/
JIT: ON CMOV SSE2 SSE3 SSE4.1 fold cse dce fwd dse narrow loop abc sink fuse
> ffi = require('ffi')
> p1 = ffi.new('char[1]')
> i1 = ffi.cast('intptr_t', p1)
> = i1
310296LL
> i2 = ffi.cast('intptr_t', p1)
> = i2
310296LL
> = string.format('%p %p', i1, i2)
0x0004be20 0x0004c210
>
They i1 and i2 have the same value, but different address.
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