Function meta_sizeof

library/LuaWrapper.cpp:582–621

* Method: sizeof for DF object references. * * Returns: size[, address] */

 * Returns: size[, address]
 */
static int meta_sizeof(lua_State *state)
{
    int argc = lua_gettop(state);

    if (argc != 1)
        luaL_error(state, "Usage: object:sizeof() or df.sizeof(object)");

    // Two special cases: nil and lightuserdata for NULL and void*
    if (lua_isnil(state, 1) || lua_islightuserdata(state, 1))
    {
        lua_pushnil(state);
        lua_pushinteger(state, (size_t)lua_touserdata(state, 1));
        return 2;
    }

    const type_identity *id = get_object_identity(state, 1, "df.sizeof()", true, true);

    // Static arrays need special handling
    if (id->type() == IDTYPE_BUFFER)
    {
        auto buf = (const df::buffer_container_identity*)id;
        const type_identity *item = buf->getItemType();
        int count = buf->getSize();

        fetch_container_details(state, lua_gettop(state), &item, &count);

        lua_pushinteger(state, item->byte_size() * count);
    }
    else
        lua_pushinteger(state, id->byte_size());

    // Add the address
    if (lua_isuserdata(state, 1))
    {
        lua_pushinteger(state, (size_t)get_object_ref(state, 1));
        return 2;
    }
    else
        return 1;
}

/**
 * Method: displace for DF object references.