1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
14 macro_rules! int_module (($T:ty, $bits:expr) => (
16 // FIXME(#11621): Should be deprecated once CTFE is implemented in favour of
17 // calling the `mem::size_of` function.
18 pub static BITS : uint = $bits;
19 // FIXME(#11621): Should be deprecated once CTFE is implemented in favour of
20 // calling the `mem::size_of` function.
21 pub static BYTES : uint = ($bits / 8);
23 // FIXME(#11621): Should be deprecated once CTFE is implemented in favour of
24 // calling the `Bounded::min_value` function.
25 pub static MIN: $T = (-1 as $T) << (BITS - 1);
26 // FIXME(#9837): Compute MIN like this so the high bits that shouldn't exist are 0.
27 // FIXME(#11621): Should be deprecated once CTFE is implemented in favour of
28 // calling the `Bounded::max_value` function.
29 pub static MAX: $T = !MIN;
45 assert!(MIN + MAX + 1 == 0);
50 num::test_num(10 as $T, 2 as $T);
55 assert!((1 as $T).abs() == 1 as $T);
56 assert!((0 as $T).abs() == 0 as $T);
57 assert!((-1 as $T).abs() == 1 as $T);
62 assert!((-1 as $T).abs_sub(&(1 as $T)) == 0 as $T);
63 assert!((1 as $T).abs_sub(&(1 as $T)) == 0 as $T);
64 assert!((1 as $T).abs_sub(&(0 as $T)) == 1 as $T);
65 assert!((1 as $T).abs_sub(&(-1 as $T)) == 2 as $T);
70 assert!((1 as $T).signum() == 1 as $T);
71 assert!((0 as $T).signum() == 0 as $T);
72 assert!((-0 as $T).signum() == 0 as $T);
73 assert!((-1 as $T).signum() == -1 as $T);
77 fn test_is_positive() {
78 assert!((1 as $T).is_positive());
79 assert!(!(0 as $T).is_positive());
80 assert!(!(-0 as $T).is_positive());
81 assert!(!(-1 as $T).is_positive());
85 fn test_is_negative() {
86 assert!(!(1 as $T).is_negative());
87 assert!(!(0 as $T).is_negative());
88 assert!(!(-0 as $T).is_negative());
89 assert!((-1 as $T).is_negative());
94 assert!(0b1110 as $T == (0b1100 as $T).bitor(&(0b1010 as $T)));
95 assert!(0b1000 as $T == (0b1100 as $T).bitand(&(0b1010 as $T)));
96 assert!(0b0110 as $T == (0b1100 as $T).bitxor(&(0b1010 as $T)));
97 assert!(0b1110 as $T == (0b0111 as $T).shl(&(1 as $T)));
98 assert!(0b0111 as $T == (0b1110 as $T).shr(&(1 as $T)));
99 assert!(-(0b11 as $T) - (1 as $T) == (0b11 as $T).not());
103 fn test_count_ones() {
104 assert!((0b0101100 as $T).count_ones() == 3);
105 assert!((0b0100001 as $T).count_ones() == 2);
106 assert!((0b1111001 as $T).count_ones() == 5);
110 fn test_count_zeros() {
111 assert!((0b0101100 as $T).count_zeros() == BITS as $T - 3);
112 assert!((0b0100001 as $T).count_zeros() == BITS as $T - 2);
113 assert!((0b1111001 as $T).count_zeros() == BITS as $T - 5);
117 fn test_swap_bytes() {
118 let n: $T = 0b0101100; assert_eq!(n.swap_bytes().swap_bytes(), n);
119 let n: $T = 0b0100001; assert_eq!(n.swap_bytes().swap_bytes(), n);
120 let n: $T = 0b1111001; assert_eq!(n.swap_bytes().swap_bytes(), n);
122 // Swapping these should make no difference
123 let n: $T = 0; assert_eq!(n.swap_bytes(), n);
124 let n: $T = -1; assert_eq!(n.swap_bytes(), n);
129 let n: $T = 0b0101100; assert_eq!(n.rotate_left(6).rotate_right(2).rotate_right(4), n);
130 let n: $T = 0b0100001; assert_eq!(n.rotate_left(3).rotate_left(2).rotate_right(5), n);
131 let n: $T = 0b1111001; assert_eq!(n.rotate_left(6).rotate_right(2).rotate_right(4), n);
133 // Rotating these should make no difference
135 // We test using 124 bits because to ensure that overlong bit shifts do
136 // not cause undefined behaviour. See #10183.
137 let n: $T = 0; assert_eq!(n.rotate_left(124), n);
138 let n: $T = -1; assert_eq!(n.rotate_left(124), n);
139 let n: $T = 0; assert_eq!(n.rotate_right(124), n);
140 let n: $T = -1; assert_eq!(n.rotate_right(124), n);
144 fn test_signed_checked_div() {
145 assert!(10i.checked_div(&2) == Some(5));
146 assert!(5i.checked_div(&0) == None);
147 assert!(int::MIN.checked_div(&-1) == None);