Function check_pen_native

library/LuaApi.cpp:643–653

}

static Pen *check_pen_native(lua_State *L, int index)
{
    lua_rawgetp(L, LUA_REGISTRYINDEX, &DFHACK_PEN_TOKEN);

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

    lua_pop(L, 2);

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

void Lua::CheckPen(lua_State *L, Screen::Pen *pen, int index, bool allow_nil, bool allow_color)
{