Extracting varying, parameterized 'new' methods to trait

I’m new to Rust and just bumped into this issue.

I have many different structs, that all implement their own new methods, with a varying number of input parameters and types. Every new method does something like this:

impl MyStruct {
    pub fn new(param1: String, param2: u32, param3: char) -> Self {
        MyStruct {
            id: None,
            param1,
            param2,
            param3,
        }
    }
}

Every struct that implements this new method has the same general structure, with varying types and amounts of fields:

pub struct MyStruct {
    pub id: Option<i64>,
    pub param1: String,
    pub param2: u32,
    pub param3: char,
    // more params
}

Manually implementing the new method on every struct seems like a lot of code repetition. Is there some way to extract this functionality into a trait?

I initially thought of using enums or generics as the parameters of the new method in the trait, but couldn’t come up with a concrete solution.

>Solution :

Due to the different signatures, you won’t be able to use a trait for this. Same with enums and generics. There is the derive-new crate you could use if your new associated functions are simple and don’t require any computation done in them.