src/libcore/tests/num/int_macros.rs

   1 macro_rules! int_module {
   2     ($T:ident, $T_i:ident) => {
   3         #[cfg(test)]
   4         mod tests {
   5             use core::mem;
   6             use core::ops::{BitAnd, BitOr, BitXor, Not, Shl, Shr};
   7             use core::$T_i::*;
   8
   9             use crate::num;
  10
  11             #[test]
  12             fn test_overflows() {
  13                 assert!(MAX > 0);
  14                 assert!(MIN <= 0);
  15                 assert_eq!(MIN + MAX + 1, 0);
  16             }
  17
  18             #[test]
  19             fn test_num() {
  20                 num::test_num(10 as $T, 2 as $T);
  21             }
  22
  23             #[test]
  24             fn test_rem_euclid() {
  25                 assert_eq!((-1 as $T).rem_euclid(MIN), MAX);
  26             }
  27
  28             #[test]
  29             pub fn test_abs() {
  30                 assert_eq!((1 as $T).abs(), 1 as $T);
  31                 assert_eq!((0 as $T).abs(), 0 as $T);
  32                 assert_eq!((-1 as $T).abs(), 1 as $T);
  33             }
  34
  35             #[test]
  36             fn test_signum() {
  37                 assert_eq!((1 as $T).signum(), 1 as $T);
  38                 assert_eq!((0 as $T).signum(), 0 as $T);
  39                 assert_eq!((-0 as $T).signum(), 0 as $T);
  40                 assert_eq!((-1 as $T).signum(), -1 as $T);
  41             }
  42
  43             #[test]
  44             fn test_is_positive() {
  45                 assert!((1 as $T).is_positive());
  46                 assert!(!(0 as $T).is_positive());
  47                 assert!(!(-0 as $T).is_positive());
  48                 assert!(!(-1 as $T).is_positive());
  49             }
  50
  51             #[test]
  52             fn test_is_negative() {
  53                 assert!(!(1 as $T).is_negative());
  54                 assert!(!(0 as $T).is_negative());
  55                 assert!(!(-0 as $T).is_negative());
  56                 assert!((-1 as $T).is_negative());
  57             }
  58
  59             #[test]
  60             fn test_bitwise_operators() {
  61                 assert_eq!(0b1110 as $T, (0b1100 as $T).bitor(0b1010 as $T));
  62                 assert_eq!(0b1000 as $T, (0b1100 as $T).bitand(0b1010 as $T));
  63                 assert_eq!(0b0110 as $T, (0b1100 as $T).bitxor(0b1010 as $T));
  64                 assert_eq!(0b1110 as $T, (0b0111 as $T).shl(1));
  65                 assert_eq!(0b0111 as $T, (0b1110 as $T).shr(1));
  66                 assert_eq!(-(0b11 as $T) - (1 as $T), (0b11 as $T).not());
  67             }
  68
  69             const A: $T = 0b0101100;
  70             const B: $T = 0b0100001;
  71             const C: $T = 0b1111001;
  72
  73             const _0: $T = 0;
  74             const _1: $T = !0;
  75
  76             #[test]
  77             fn test_count_ones() {
  78                 assert_eq!(A.count_ones(), 3);
  79                 assert_eq!(B.count_ones(), 2);
  80                 assert_eq!(C.count_ones(), 5);
  81             }
  82
  83             #[test]
  84             fn test_count_zeros() {
  85                 let bits = mem::size_of::<$T>() * 8;
  86                 assert_eq!(A.count_zeros(), bits as u32 - 3);
  87                 assert_eq!(B.count_zeros(), bits as u32 - 2);
  88                 assert_eq!(C.count_zeros(), bits as u32 - 5);
  89             }
  90
  91             #[test]
  92             fn test_leading_trailing_ones() {
  93                 let bits = (mem::size_of::<$T>() * 8) as u32;
  94
  95                 let a: $T = 0b0101_1111;
  96                 assert_eq!(a.trailing_ones(), 5);
  97                 assert_eq!((!a).leading_ones(), bits - 7);
  98
  99                 assert_eq!(a.reverse_bits().leading_ones(), 5);
 100
 101                 assert_eq!(_1.leading_ones(), bits);
 102                 assert_eq!(_1.trailing_ones(), bits);
 103
 104                 assert_eq!((_1 << 1).trailing_ones(), 0);
 105                 assert_eq!(MAX.leading_ones(), 0);
 106
 107                 assert_eq!((_1 << 1).leading_ones(), bits - 1);
 108                 assert_eq!(MAX.trailing_ones(), bits - 1);
 109
 110                 assert_eq!(_0.leading_ones(), 0);
 111                 assert_eq!(_0.trailing_ones(), 0);
 112
 113                 let x: $T = 0b0010_1100;
 114                 assert_eq!(x.leading_ones(), 0);
 115                 assert_eq!(x.trailing_ones(), 0);
 116             }
 117
 118             #[test]
 119             fn test_rotate() {
 120                 assert_eq!(A.rotate_left(6).rotate_right(2).rotate_right(4), A);
 121                 assert_eq!(B.rotate_left(3).rotate_left(2).rotate_right(5), B);
 122                 assert_eq!(C.rotate_left(6).rotate_right(2).rotate_right(4), C);
 123
 124                 // Rotating these should make no difference
 125                 //
 126                 // We test using 124 bits because to ensure that overlong bit shifts do
 127                 // not cause undefined behaviour. See #10183.
 128                 assert_eq!(_0.rotate_left(124), _0);
 129                 assert_eq!(_1.rotate_left(124), _1);
 130                 assert_eq!(_0.rotate_right(124), _0);
 131                 assert_eq!(_1.rotate_right(124), _1);
 132
 133                 // Rotating by 0 should have no effect
 134                 assert_eq!(A.rotate_left(0), A);
 135                 assert_eq!(B.rotate_left(0), B);
 136                 assert_eq!(C.rotate_left(0), C);
 137                 // Rotating by a multiple of word size should also have no effect
 138                 assert_eq!(A.rotate_left(64), A);
 139                 assert_eq!(B.rotate_left(64), B);
 140                 assert_eq!(C.rotate_left(64), C);
 141             }
 142
 143             #[test]
 144             fn test_swap_bytes() {
 145                 assert_eq!(A.swap_bytes().swap_bytes(), A);
 146                 assert_eq!(B.swap_bytes().swap_bytes(), B);
 147                 assert_eq!(C.swap_bytes().swap_bytes(), C);
 148
 149                 // Swapping these should make no difference
 150                 assert_eq!(_0.swap_bytes(), _0);
 151                 assert_eq!(_1.swap_bytes(), _1);
 152             }
 153
 154             #[test]
 155             fn test_le() {
 156                 assert_eq!($T::from_le(A.to_le()), A);
 157                 assert_eq!($T::from_le(B.to_le()), B);
 158                 assert_eq!($T::from_le(C.to_le()), C);
 159                 assert_eq!($T::from_le(_0), _0);
 160                 assert_eq!($T::from_le(_1), _1);
 161                 assert_eq!(_0.to_le(), _0);
 162                 assert_eq!(_1.to_le(), _1);
 163             }
 164
 165             #[test]
 166             fn test_be() {
 167                 assert_eq!($T::from_be(A.to_be()), A);
 168                 assert_eq!($T::from_be(B.to_be()), B);
 169                 assert_eq!($T::from_be(C.to_be()), C);
 170                 assert_eq!($T::from_be(_0), _0);
 171                 assert_eq!($T::from_be(_1), _1);
 172                 assert_eq!(_0.to_be(), _0);
 173                 assert_eq!(_1.to_be(), _1);
 174             }
 175
 176             #[test]
 177             fn test_signed_checked_div() {
 178                 assert_eq!((10 as $T).checked_div(2), Some(5));
 179                 assert_eq!((5 as $T).checked_div(0), None);
 180                 assert_eq!(isize::MIN.checked_div(-1), None);
 181             }
 182
 183             #[test]
 184             fn test_saturating_abs() {
 185                 assert_eq!((0 as $T).saturating_abs(), 0);
 186                 assert_eq!((123 as $T).saturating_abs(), 123);
 187                 assert_eq!((-123 as $T).saturating_abs(), 123);
 188                 assert_eq!((MAX - 2).saturating_abs(), MAX - 2);
 189                 assert_eq!((MAX - 1).saturating_abs(), MAX - 1);
 190                 assert_eq!(MAX.saturating_abs(), MAX);
 191                 assert_eq!((MIN + 2).saturating_abs(), MAX - 1);
 192                 assert_eq!((MIN + 1).saturating_abs(), MAX);
 193                 assert_eq!(MIN.saturating_abs(), MAX);
 194             }
 195
 196             #[test]
 197             fn test_saturating_neg() {
 198                 assert_eq!((0 as $T).saturating_neg(), 0);
 199                 assert_eq!((123 as $T).saturating_neg(), -123);
 200                 assert_eq!((-123 as $T).saturating_neg(), 123);
 201                 assert_eq!((MAX - 2).saturating_neg(), MIN + 3);
 202                 assert_eq!((MAX - 1).saturating_neg(), MIN + 2);
 203                 assert_eq!(MAX.saturating_neg(), MIN + 1);
 204                 assert_eq!((MIN + 2).saturating_neg(), MAX - 1);
 205                 assert_eq!((MIN + 1).saturating_neg(), MAX);
 206                 assert_eq!(MIN.saturating_neg(), MAX);
 207             }
 208
 209             #[test]
 210             fn test_from_str() {
 211                 fn from_str<T: ::std::str::FromStr>(t: &str) -> Option<T> {
 212                     ::std::str::FromStr::from_str(t).ok()
 213                 }
 214                 assert_eq!(from_str::<$T>("0"), Some(0 as $T));
 215                 assert_eq!(from_str::<$T>("3"), Some(3 as $T));
 216                 assert_eq!(from_str::<$T>("10"), Some(10 as $T));
 217                 assert_eq!(from_str::<i32>("123456789"), Some(123456789 as i32));
 218                 assert_eq!(from_str::<$T>("00100"), Some(100 as $T));
 219
 220                 assert_eq!(from_str::<$T>("-1"), Some(-1 as $T));
 221                 assert_eq!(from_str::<$T>("-3"), Some(-3 as $T));
 222                 assert_eq!(from_str::<$T>("-10"), Some(-10 as $T));
 223                 assert_eq!(from_str::<i32>("-123456789"), Some(-123456789 as i32));
 224                 assert_eq!(from_str::<$T>("-00100"), Some(-100 as $T));
 225
 226                 assert_eq!(from_str::<$T>(""), None);
 227                 assert_eq!(from_str::<$T>(" "), None);
 228                 assert_eq!(from_str::<$T>("x"), None);
 229             }
 230
 231             #[test]
 232             fn test_from_str_radix() {
 233                 assert_eq!($T::from_str_radix("123", 10), Ok(123 as $T));
 234                 assert_eq!($T::from_str_radix("1001", 2), Ok(9 as $T));
 235                 assert_eq!($T::from_str_radix("123", 8), Ok(83 as $T));
 236                 assert_eq!(i32::from_str_radix("123", 16), Ok(291 as i32));
 237                 assert_eq!(i32::from_str_radix("ffff", 16), Ok(65535 as i32));
 238                 assert_eq!(i32::from_str_radix("FFFF", 16), Ok(65535 as i32));
 239                 assert_eq!($T::from_str_radix("z", 36), Ok(35 as $T));
 240                 assert_eq!($T::from_str_radix("Z", 36), Ok(35 as $T));
 241
 242                 assert_eq!($T::from_str_radix("-123", 10), Ok(-123 as $T));
 243                 assert_eq!($T::from_str_radix("-1001", 2), Ok(-9 as $T));
 244                 assert_eq!($T::from_str_radix("-123", 8), Ok(-83 as $T));
 245                 assert_eq!(i32::from_str_radix("-123", 16), Ok(-291 as i32));
 246                 assert_eq!(i32::from_str_radix("-ffff", 16), Ok(-65535 as i32));
 247                 assert_eq!(i32::from_str_radix("-FFFF", 16), Ok(-65535 as i32));
 248                 assert_eq!($T::from_str_radix("-z", 36), Ok(-35 as $T));
 249                 assert_eq!($T::from_str_radix("-Z", 36), Ok(-35 as $T));
 250
 251                 assert_eq!($T::from_str_radix("Z", 35).ok(), None::<$T>);
 252                 assert_eq!($T::from_str_radix("-9", 2).ok(), None::<$T>);
 253             }
 254
 255             #[test]
 256             fn test_pow() {
 257                 let mut r = 2 as $T;
 258
 259                 assert_eq!(r.pow(2), 4 as $T);
 260                 assert_eq!(r.pow(0), 1 as $T);
 261                 r = -2 as $T;
 262                 assert_eq!(r.pow(2), 4 as $T);
 263                 assert_eq!(r.pow(3), -8 as $T);
 264             }
 265         }
 266     };
 267 }