1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

pub trait CharMatch {
    fn char_match(&self, c: char) -> bool;
}

impl CharMatch for str {
    fn char_match(&self, c: char) -> bool {
        self.contains(c)
    }
}
impl CharMatch for &str {
    fn char_match(&self, c: char) -> bool {
        self.contains(c)
    }
}
impl CharMatch for char {
    fn char_match(&self, c: char) -> bool {
        *self == c
    }
}

impl<F: Fn(char) -> bool> CharMatch for F {
    fn char_match(&self, c: char) -> bool {
        self(c)
    }
}