cipri-tom

local function printf(s, ...)
  io.write(s:format(...))
end

local ffi = require("ffi")
ffi.cdef[[
  typedef void (*cb)(void);
  void set_v(int n, void (*)(void  ));
  void set_i(int n, void (*)(int   ));
  void set_d(int n, void (*)(double));