Re: A way to associate a Lua value with a FFI pointer?
- From: Geoff Leyland <geoff_leyland@xxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Wed, 9 Apr 2014 21:13:33 +1200
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)
Other related posts:
