Function check_random_native

library/LuaApi.cpp:1081–1091

static int DFHACK_RANDOM_TOKEN = 0;

static MersenneRNG *check_random_native(lua_State *L, int index)
{
    lua_rawgetp(L, LUA_REGISTRYINDEX, &DFHACK_RANDOM_TOKEN);

    if (!lua_getmetatable(L, index) || !lua_rawequal(L, -1, -2))
        luaL_argerror(L, index, "not a random generator object");

    lua_pop(L, 2);

    return (MersenneRNG*)lua_touserdata(L, index);
}

static int dfhack_random_init(lua_State *L)
{