A simple builder in rust (using the `derive_builder` crate).

simple_builder.rs

#[macro_use]
extern crate derive_builder;

#[derive(Default, Builder, Debug)]
#[builder(setter(into))]
struct House {
    floors: u32,
    rooms: u32,
    #[builder(default = "false")]
    has_garage: bool,
}

fn main() -> Result<(), HouseBuilderError> {
    let house = HouseBuilder::default()
        .floors(2u32)
        .rooms(3u32)
        .has_garage(true)
        .build()?;

    println!("House : {:?}", house);
    Ok(())
}