HashSet作为其他HashSet的键(HashSet as key for other HashSet)

 我试图使用HashSet<String>作为其他HashSet的键。 我发现这个问题和答案指出为HashSet<String>实现Hash特征，但我不能让我的具体案例工作。 
 
 幸运的是我的情况更加严格，所以我需要的是： 
 
 
 
 仅为 HashSet<String>类型实现hash特征 
 
 
 哈希现在应该非常简单： 
 
 
 集合{"q3", "q1", "q2"}应该作为一个简单的有序，连接的字符串版本进行hash("q1-q2-q3") ，类似hash("q1-q2-q3") 。 获取"q1-q2-q3"不是问题，但在hash使用它会抛出我无法处理的所有类型的错误。 
 
 这是我的实施尝试，但它不起作用。 我认为StateSet包装器不是正确的方法，因为我丢失了所有重要的HashSet方法 
 
use std::collections::{HashMap,HashSet};
use std::hash::{Hash,Hasher};

type State = String;
struct StateSet(HashSet<State>);

impl PartialEq for StateSet {
    fn eq(&self, other: &StateSet) -> bool {
        self.is_subset(&other) && other.is_subset(&self) 
    }
}

impl Eq for StateSet {}

impl Hash for StateSet {
    fn hash<H>(&self, state: &mut H) where H: Hasher {
        let a: Vec<State> = self.iter().collect();
        a.sort();
        for s in a.iter() {
            s.hash(state);
        }
    }

}

fn main() {
    let hmap: HashSet<StateSet> = HashSet::new(); 
}
 
 （ 游乐场 ） 

Im trying to use a HashSet<String> as a key for other HashSet. I have found this question and answer that points out to implement the Hash trait for HashSet<String>, but I couldn't make my specific case to work.
 
My case is luckily more bound so what I need is:
 
 
 
Implement the hash trait only for the type HashSet<String>
 
 
The hashing should be very simple for now:
 
 
The set {"q3", "q1", "q2"} should be hashed as a simple ordered, joined string version of it, something like hash("q1-q2-q3"). Obtaining "q1-q2-q3" is not a problem but using it inside a hash throws all sort of errors I could not deal with. 
 
This is my attempt of implementation, but it doesn't work. I think that the StateSet wrapper is not the right way of doing it, because I lose all the important HashSet methods
 
use std::collections::{HashMap,HashSet};
use std::hash::{Hash,Hasher};

type State = String;
struct StateSet(HashSet<State>);

impl PartialEq for StateSet {
    fn eq(&self, other: &StateSet) -> bool {
        self.is_subset(&other) && other.is_subset(&self) 
    }
}

impl Eq for StateSet {}

impl Hash for StateSet {
    fn hash<H>(&self, state: &mut H) where H: Hasher {
        let a: Vec<State> = self.iter().collect();
        a.sort();
        for s in a.iter() {
            s.hash(state);
        }
    }

}

fn main() {
    let hmap: HashSet<StateSet> = HashSet::new(); 
}
 
(playground)

原文：https://stackoverflow.com/questions/36562419