default.rs

fn foo(foo: u32) -> u32 {
    println!("foo {}", foo);
    foo + 1
}

#[derive(Debug)]
struct Bar {
    bar1: u32,
    bar2: u32,
    bar3: u32,
}

impl Default for Bar {
    fn default() -> Self {
        Self {
            bar1: foo(1),
            bar2: 0,
            bar3: 0,
        }
    }
}

impl Bar {
    pub fn with_bar1(bar1: u32) -> Self {
        Self {
            bar1,
            ..Default::default()
        }
    }
}

fn main() {
    let bar = Bar::with_bar1(3);
    println!("bar {:?}", bar);
}