use std::fmt::Debug;

pub trait THeader: Debug {
    fn m(&self) {
        println!("hello");
    }

    fn get_comparator(&self) -> &str;
}
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
struct THeader1;
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
struct THeader2;

impl THeader for THeader1
{
    fn get_comparator(&self) -> &str {
        "header1"
    }
}
impl THeader for THeader2 {
    fn get_comparator(&self) -> &str {
        "header2"
    }
}


impl PartialEq<Box<THeader>> for Box<THeader> {
    fn eq(&self, other: &Box<THeader>) -> bool {
        self.get_comparator() == other.get_comparator()
    }
}

#[derive(Debug)]
pub enum Header {
    H(Box<THeader>),
}


impl PartialEq<Header> for Header {
    fn eq(&self, other: &Header) -> bool {
        match self {
            Header::H(a) => match other {
                Header::H(b) => a.get_comparator() == b.get_comparator(),
                _ => false
            },
            _ => false
        }
    }
}

fn main()
{
    let h1 = Header::H(Box::new(THeader1{}));
    let h2 = Header::H(Box::new(THeader2{}));
    if h1 == h2 {
        println!("eq");
    }
}