Crate derive_builder

Derive a builder for a struct

Use in combination with custom_derive.

Examples

#[macro_use] extern crate custom_derive;
#[macro_use] extern crate derive_builder;

custom_derive!{
    #[derive(Debug, PartialEq, Default, Builder)]
    struct Lorem {
        ipsum: String,
        dolor: i32,
    }
}

fn main() {
    let x = Lorem::default().ipsum("sit").dolor(42);
    assert_eq!(x, Lorem { ipsum: "sit".into(), dolor: 42 });
}

Generic structs

#[macro_use] extern crate custom_derive;
#[macro_use] extern crate derive_builder;

custom_derive!{
    #[derive(Debug, PartialEq, Default, Builder)]
    struct GenLorem<T> {
        ipsum: String,
        dolor: T,
    }
}

fn main() {
    let x = GenLorem::default().ipsum("sit").dolor(42);
    assert_eq!(x, GenLorem { ipsum: "sit".into(), dolor: 42 });
}

Gotchas

• Tuple structs and unit structs are not supported as they have no field names.
• When defining a generic struct, you cannot use VALUE as a generic parameter as this is what all setters are using.

Macros

Builder!

Builder! macro