I have a trait which looks like this,
trait Indicator<In, Out> {
fn consume(&mut self, data: &Vec<In>) -> Vec<Out>;
}
I want to implement
Add for all such indicators, such that if the Out has Add instance it should just add them
But rust keeps cribbing about I cannot implement traits for arbitrary types if not in the same crate
Also, the
In parameter for arbitrary Indicator is not constrained. Is there a way to fix that too? Since I can't add PhantomData field for arbitrary Indicator
impl<In, N, R> Add<R> for dyn Indicator<In, N> where R: Indicator<In, N>, N : Add<N> {
type Output = Zip<N, N, dyn Indicator<In, N>, R, fn(N, N)>;
fn add(self, rhs: R) -> Self::Output {
Zip {
left: self,
right: rhs,
zipper: Add::add,
left_buffer: VecDeque::new(),
right_buffer: VecDeque::new()
}
}
}
Also this,
impl<In, N, I, R> Add<R> for I where I : Indicator<In, N>, R: Indicator<In, N>, N : Add<N>
Neither works
ohh wait just noticed you said the same, my bad
what error do you get for
impl<In, N, I, R> Add<R> for I where I : Indicator<In, N>, R: Indicator<In, N>, N : Add<N> as i dont have anywere to check it
Also
unconstrained type parameter both for In and N
It was complaining that I cannot implement Add since its not in my crate
I defined,
struct Indicator<In, Transducer, Out> {
input: PhantomData<In>,
output: PhantomData<Out>,
processor: Transducer
}
and Transducer as the original Indicator. I suppose every problem can indeed be solved with another level of indirection
BTW, Add is from standard library
That's the way you overload the operator
+
But thanks for the hint
Hello Everyone , I have been trying to learn Rust / Diesel and have taken up some pet project to do so. I was trying to convert the following to Diesel , currently I am clueless can someone please point me to a direction ?
select p.id,name, gender, p.email, phone, age, photo , industry, tags, country , area, twitter, user_list_id from people
as p left join
(
select * from list_people lp
inner join user_list ul on lp.user_list_id = ul.id
inner join users u on ul.user_id = u.id
where u.id = 1
) g on p.id = g.people_id
Thats from diesel, i would suggest trying the diesel-rs/diesel gitter and https://github.com/diesel-rs/diesel/discussions/categories/q-a
Dear All,
I am new on Rust, I want using Serde Destabilize struct that contain field uuid (byte) any help to archive that
`pub fn decode_serde<'de, T, R>(r: R) -> io::Result<T>
where
T: Deserialize<'de>,
R: io::Read,
{
Deserialize::deserialize(&mut Deserializer::new(r)).map_err(map_err_to_io)
}`With Deserialize::deserialize can modified to support uuid ?
Let me quick explain my case, I am using Actix web framework, by connect to database Tarantool, assume tble_user fields id(uuid), first_name, last_name,email. After I execute query select the result response need to use Serde Deserialize to my Struct all field success except field id contain data type uuid can't deserialize
I am using this crate :https://github.com/zheludkovm/RustyTarantool/blob/master/src/tarantool/tools.rs#L24
I am using this crate :https://github.com/zheludkovm/RustyTarantool/blob/master/src/tarantool/tools.rs#L24
Do you mean
Uuid from the uuid crate? Do you need some specific way of storing it in the table?
Have you enabled the
uuid's serde feature?
Yes uuid's serde feature
1 reply
Something like
#[serde(with = "uuid::serde::compact")] specified for that specific field, I think.