sugar 0.2.0

Rust syntax sugar collections.
Documentation 
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39

#[macro_export]
macro_rules! cmp {

    // binary operator
    ($a:expr, < $b:expr) => { $a < $b };
    ($a:expr, <= $b:expr) => { $a <= $b };
    ($a:expr, > $b:expr) => { $a > $b };
    ($a:expr, >= $b:expr) => { $a >= $b };
    ($a:expr, == $b:expr) => { $a == $b };
    ($a:expr, != $b:expr) => { $a != $b };

    // multiple members operator (members >= 3)
    ($a:expr, $op1:tt $b:expr, $($op:tt $e:expr),+) => {{
        let b = $b;
        cmp!($a, $op1 b) && cmp!(b, $($op $e),+)
    }};
}

#[cfg(test)]
mod tests {
    #[test]
    fn cmp_3_test() {
        assert!(cmp!(3, > 2, > 1));
        assert!(cmp!(1, < 2, < 3));
        assert!(cmp!(3, > 2, < 4));
        assert!(cmp!(4, > 2, < 3));
        assert!(cmp!(3, >= 3, > 2));
        assert!(cmp!(3, > 2, >= 2));
        assert!(cmp!(3, >= 3, <= 3));
        assert!(cmp!(2, == 2, == 2));
        assert!(cmp!(1, != 2, == 2));
    }

    #[test]
    fn cmp_multiple_test() {
        assert!(cmp!(1, < 2, == 2, <= 3, < 4));
        assert!(cmp!(1, != 2, == 2, > 1, > 0));
    }
}