cfor 0.2.0

A macro that gives Rust a C-style for loop, with initialisation, condition and step. This correctly handles control-flow like continue and break. 
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
40
41
42
43
44
45
46
47

#[macro_use] extern crate cfor;

#[test]
fn smoketest() {
    let mut tick = 0;
    cfor!{let mut i = 1; i <= 0b1000_0000; i *= 2; {
        tick += 1;
    }}

    assert_eq!(tick, 8);

    tick = 0;
    cfor!{let (mut a, mut b) = (0, 0); a + b < 20; { a += 1; b += 1; }; {
        tick += 1;
    }}
    assert_eq!(tick, 10);
}

#[test]
#[should_fail]
fn continue_updates() {
    cfor!(let i = 0; i < 10; panic!(); {
        // we *should* hit the step expression.
        continue
    })
}

#[test]
fn missing_parts() {
    let mut inside = false;
    cfor!{;; (); {
        inside = true;
        break
    }}
    assert!(inside);

    inside = false;
    cfor!{();; (); {
        inside = true;
        break
    }}
    assert!(inside);

    cfor!{; false; ; {
        panic!()
    }}
}