Function lua_topointer

lua/lapi.c:408–419

LUA_API const void *lua_topointer (lua_State *L, int idx) {
  StkId o = index2adr(L, idx);
  switch (ttype(o)) {
    case LUA_TTABLE: return hvalue(o);
    case LUA_TFUNCTION: return clvalue(o);
    case LUA_TTHREAD: return thvalue(o);
    case LUA_TUSERDATA:
    case LUA_TLIGHTUSERDATA:
      return lua_touserdata(L, idx);
    default: return NULL;
  }
}