Function with a generic parameter type

Question

I am using the Rocket web framework and I need to create a function with a generic parameter type parameter:

use rocket_contrib::json::{Json, JsonValue};

fn bluid_succes_response<T>(data: T) ->  JsonValue  { 
    json!(data) 
}

This is the error I have:

the trait `dataStructures::parameters_structures::_::_serde::Serialize` is not implemented for `T`

How can I implement the Serialize trait for a generic type like T or is there another way to solve the problem?

Answer 1

You need to constrain the generic type T to a trait (Serialize in this case):

use rocket_contrib::json::{Json, JsonValue};

fn bluid_succes_response<T: serde::Serialize>(data: T) ->  JsonValue  { 
    json!(data) 
}