我试图在实现cmp()和eq()fromOrd和PartialEqtrait时结合多个条件。看起来像这样的东西：

self.id.cmp(&other.id) && self.age.cmp(&other.age)

这是一个减去组合条件的工作示例：

use std::cmp::Ordering;

#[derive(Debug, Clone, Eq)]
pub struct Person {
    pub id: u32,
    pub age: u32,
}

impl Person {
    pub fn new(id: u32, age: u32) -> Self {
        Self {
            id,
            age,
        }
    }
}

impl Ord for Person {
    fn cmp(&self, other: &Self) -> Ordering {
        self.id.cmp(&other.id)
    }
}

impl PartialOrd for Person {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl PartialEq for Person {
    fn eq(&self, other: &Self) -> bool {
        self.id == other.id
    }
}

回答

    fn cmp(&self, other: &Self) -> Ordering {
        self.id.cmp(&other.id)
            .then(self.age.cmp(&other.age))
    }