Re: A way to associate a Lua value with a FFI pointer?
- From: Daniel Kolesa <quaker66@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 9 Apr 2014 10:20:49 +0100
That's pretty much the mapping table solution took a bit further :)
2014-04-09 10:13 GMT+01:00 Geoff Leyland <geoff_leyland@xxxxxxxxxxx>:
> On 9/04/2014, at 8:54 pm, Daniel Kolesa <quaker66@xxxxxxxxx> wrote:
>
> > I would like to know if there is any way to associate a generic Lua
> value with a FFI pointer.
>
> Would a metatable on the c type help? Something like this:
>
> ffi = require"ffi"
>
> ffi.cdef"struct A { int x; };"
>
> data = setmetatable({}, { __mode = "k" })
>
> ffi.metatype("struct A", {
> __index = function(a, key) if not data[a] then data[a] = {} end return
> data[a].key end,
> __newindex = function(a, key, value) if not data[a] then data[a] = {}
> end data[a].key = value end,
> })
>
> a = ffi.new"struct A"
>
> a.newkey = 1
> print(a.newkey)
>
>
>
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