smart_hash/
traits.rs

1use std::collections::HashSet;
2
3pub trait SmartHash { 
4    type option;
5
6    fn into_option(&self) -> Self::option;
7}
8
9pub trait SmartHashOpt where Self : Default { }
10
11pub trait SmartHashSet where <Self as SmartHashSet>::output : SmartHash, <Self as SmartHashSet>::option : Default
12{
13    type output;
14    type option;
15
16    fn get_matching<'a>(&'a self, options : <<Self as SmartHashSet>::output as SmartHash>::option) -> Option<Vec<&'a Self::output>>;
17
18    fn get_none_default(&self) -> Self::option {
19        Self::option::default()
20    }
21}
22
23impl<SH> SmartHashSet for HashSet<SH>
24    where SH : SmartHash + std::hash::Hash + std::cmp::Eq,
25            <SH as SmartHash>::option : std::cmp::PartialEq + Default,
26{ 
27    type output = SH;
28    type option = SH::option;
29
30    fn get_matching<'a>(&'a self, options : <SH as SmartHash>::option) -> Option<Vec<&'a SH>> {
31        let mut matches : Vec<&SH> = Vec::new();
32
33        for item in self.iter() {
34            let option = item.into_option();
35            if option == options {
36                matches.push(&item);
37            }
38        }
39
40        if matches.len() > 0 {
41            Some(matches)
42        } else {
43            None
44        }
45    }
46}
smart_hash/traits.rs

smart_hash/
traits.rs
