How can I convert a struct to another struct with exactly the same field names and types?

user_8215719 0
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I've got two identical structs with the same name, fields (and field types), that live in different modules. These are constructed by a derive macro and would like to easily convert from one to the other.

e.g.

mod a {
    struct A {
        field1: String,
        field2: String,
    }
}

mod b {
    struct A {
        field1: String,
        field2: String,
    }
}

I'd like to be able to do let a: a::A = a::A::from(b::A) or similar.

impl From<b::A> for a::A requires writing all the fields from both structs in the from() method. Is there any way to achieve this without all the associated boilerplate?

rust struct type-conversion
1 Answers

It seems that until something like this is implemented the only way to achieve this conversion is serialising:

impl From<b::A> for a::A {
    fn from(a: b::A) -> Self {
        let serialised = serde_json::to_string(&a).unwrap();
        serde_json::from_str(&serialised).unwrap()
    }
}

Source

user_82157190
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