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 11:02:02 +0200
On 4/9/14 10:54 AM, Daniel Kolesa wrote:
> Hello,
>
> I would like to know if there is any way to associate a generic Lua
> value with a FFI pointer.
I'm not sure if I have the full context, but I do this sort of thing:
```
local reg = { }
function setptrvalue(ptr, val)
local key = tonumber(ffi.cast('intptr_t', ptr))
reg[key] = val
end
function getptrvalue(ptr)
local key = tonumber(ffi.cast('intptr_t', ptr))
return reg[key]
end
```
You can always get your pointer back from `intptr_t` with a cast.
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