binrw 0.15.1

A Rust crate for helping read structs from binary data using ✨macro magic✨
Documentation 
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use binrw::{io::Cursor, BinWrite, Endian};

#[test]
fn if_cond() {
    #[derive(BinWrite)]
    struct Test {
        x: u8,
        #[bw(if(*x > 1, 10))]
        y: u16,
        #[bw(if(*x > 2))]
        z: u32,
    }

    let mut x = Cursor::new(Vec::new());

    Test { x: 1, y: 2, z: 3 }
        .write_options(&mut x, Endian::Big, ())
        .unwrap();

    assert_eq!(&x.into_inner(), &[1, 0, 10]);

    let mut x = Cursor::new(Vec::new());

    Test { x: 2, y: 3, z: 4 }
        .write_options(&mut x, Endian::Big, ())
        .unwrap();

    assert_eq!(&x.into_inner(), &[2, 0, 3]);

    let mut x = Cursor::new(Vec::new());

    Test { x: 3, y: 4, z: 5 }
        .write_options(&mut x, Endian::Big, ())
        .unwrap();

    assert_eq!(&x.into_inner(), &[3, 0, 4, 0, 0, 0, 5]);
}