about the default value

[2moe]

    use typed_builder::TypedBuilder;

    #[derive(Debug, TypedBuilder)]
    struct Foo {
        // #[builder(default = Foo::default().n)]
        #[builder(default)]
        n: u8,
    }

    impl Default for Foo {
        fn default() -> Self {
            Self { n: 100 }
        }
    }

    let Foo { n } = Foo::builder().build();

    // assert_eq!(n, 0);
    if n == u8::default() {
        eprintln!("u8::default")
    }

    // assert_eq!(n, 100);
    if n == Foo::default().n {
        eprintln!("Foo::default")
    }

As in the example above, I want the default to be Foo::default().n, not u8::default().

The behavior is like #[serde(default)].

Aside from manually specifying Foo::default().n, is there an easier way to specify the default value as the default value of the field corresponding to the structure itself, rather than the default value of the field type?

[idanarye]

Just do it the other way around - define the Default using the builder:

#[derive(Debug, TypedBuilder)]
struct Foo {
    #[builder(default = 100)]
    n: u8,
}

impl Default for Foo {
    fn default() -> Self {
        Self::builder().build()
    }
}

[2moe]

Thanks