src/test/ui/proc-macro/macro-quote-cond.rs


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

// run-pass
// aux-build:cond_plugin.rs

#![allow(unused_parens)]

extern crate cond_plugin;

use cond_plugin::cond;

fn fact(n : i64) -> i64 {
    if n == 0 {
        1
    } else {
        n * fact(n - 1)
    }
}

fn fact_cond(n : i64) -> i64 {
  cond!(
    ((n == 0) 1)
    (else (n * fact_cond(n-1)))
  )
}

fn fib(n : i64) -> i64 {
  if n == 0 || n == 1 {
      1
  } else {
      fib(n-1) + fib(n-2)
  }
}

fn fib_cond(n : i64) -> i64 {
  cond!(
    ((n == 0) 1)
    ((n == 1) 1)
    (else (fib_cond(n-1) + fib_cond(n-2)))
  )
}

fn main() {
    assert_eq!(fact(3), fact_cond(3));
    assert_eq!(fact(5), fact_cond(5));
    assert_eq!(fib(5), fib_cond(5));
    assert_eq!(fib(8), fib_cond(8));
}