use bitflags::bitflags;

bitflags! {
    struct Flags: u32 {
        const A = 0b00000001;
        const B = 0b00000010;
        const C = 0b00000100;
        const ABC = Self::A.bits | Self::B.bits | Self::C.bits;
    }
}

fn main() {
    let e1 = Flags::A | Flags::C;
    let e2 = Flags::B | Flags::C;
    assert_eq!((e1 | e2), Flags::ABC); // union
    assert_eq!((e1 & e2), Flags::C); // intersection
    assert_eq!((e1 - e2), Flags::A); // set difference
    assert_eq!(!e2, Flags::A); // set complement
}