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
//@ proc-macro: 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));
}
|
