vendor/rustc-rayon/tests/producer_split_at.rs

   1 use rayon::iter::plumbing::*;
   2 use rayon::prelude::*;
   3
   4 /// Stress-test indexes for `Producer::split_at`.
   5 fn check<F, I>(expected: &[I::Item], mut f: F)
   6 where
   7     F: FnMut() -> I,
   8     I: IntoParallelIterator,
   9     I::Iter: IndexedParallelIterator,
  10     I::Item: PartialEq + std::fmt::Debug,
  11 {
  12     map_triples(expected.len() + 1, |i, j, k| {
  13         Split::forward(f(), i, j, k, expected);
  14         Split::reverse(f(), i, j, k, expected);
  15     });
  16 }
  17
  18 fn map_triples<F>(end: usize, mut f: F)
  19 where
  20     F: FnMut(usize, usize, usize),
  21 {
  22     for i in 0..end {
  23         for j in i..end {
  24             for k in j..end {
  25                 f(i, j, k);
  26             }
  27         }
  28     }
  29 }
  30
  31 #[derive(Debug)]
  32 struct Split {
  33     i: usize,
  34     j: usize,
  35     k: usize,
  36     reverse: bool,
  37 }
  38
  39 impl Split {
  40     fn forward<I>(iter: I, i: usize, j: usize, k: usize, expected: &[I::Item])
  41     where
  42         I: IntoParallelIterator,
  43         I::Iter: IndexedParallelIterator,
  44         I::Item: PartialEq + std::fmt::Debug,
  45     {
  46         let result = iter.into_par_iter().with_producer(Split {
  47             i,
  48             j,
  49             k,
  50             reverse: false,
  51         });
  52         assert_eq!(result, expected);
  53     }
  54
  55     fn reverse<I>(iter: I, i: usize, j: usize, k: usize, expected: &[I::Item])
  56     where
  57         I: IntoParallelIterator,
  58         I::Iter: IndexedParallelIterator,
  59         I::Item: PartialEq + std::fmt::Debug,
  60     {
  61         let result = iter.into_par_iter().with_producer(Split {
  62             i,
  63             j,
  64             k,
  65             reverse: true,
  66         });
  67         assert!(result.iter().eq(expected.iter().rev()));
  68     }
  69 }
  70
  71 impl<T> ProducerCallback<T> for Split {
  72     type Output = Vec<T>;
  73
  74     fn callback<P>(self, producer: P) -> Self::Output
  75     where
  76         P: Producer<Item = T>,
  77     {
  78         println!("{:?}", self);
  79
  80         // Splitting the outer indexes first gets us an arbitrary mid section,
  81         // which we then split further to get full test coverage.
  82         let (left, d) = producer.split_at(self.k);
  83         let (a, mid) = left.split_at(self.i);
  84         let (b, c) = mid.split_at(self.j - self.i);
  85
  86         let a = a.into_iter();
  87         let b = b.into_iter();
  88         let c = c.into_iter();
  89         let d = d.into_iter();
  90
  91         check_len(&a, self.i);
  92         check_len(&b, self.j - self.i);
  93         check_len(&c, self.k - self.j);
  94
  95         let chain = a.chain(b).chain(c).chain(d);
  96         if self.reverse {
  97             chain.rev().collect()
  98         } else {
  99             chain.collect()
 100         }
 101     }
 102 }
 103
 104 fn check_len<I: ExactSizeIterator>(iter: &I, len: usize) {
 105     assert_eq!(iter.size_hint(), (len, Some(len)));
 106     assert_eq!(iter.len(), len);
 107 }
 108
 109 // **** Base Producers ****
 110
 111 #[test]
 112 fn empty() {
 113     let v = vec![42];
 114     check(&v[..0], rayon::iter::empty);
 115 }
 116
 117 #[test]
 118 fn once() {
 119     let v = vec![42];
 120     check(&v, || rayon::iter::once(42));
 121 }
 122
 123 #[test]
 124 fn option() {
 125     let v = vec![42];
 126     check(&v, || Some(42));
 127 }
 128
 129 #[test]
 130 fn range() {
 131     let v: Vec<_> = (0..10).collect();
 132     check(&v, || 0..10);
 133 }
 134
 135 #[test]
 136 fn range_inclusive() {
 137     let v: Vec<_> = (0u16..=10).collect();
 138     check(&v, || 0u16..=10);
 139 }
 140
 141 #[test]
 142 fn repeatn() {
 143     let v: Vec<_> = std::iter::repeat(1).take(5).collect();
 144     check(&v, || rayon::iter::repeatn(1, 5));
 145 }
 146
 147 #[test]
 148 fn slice_iter() {
 149     let s: Vec<_> = (0..10).collect();
 150     let v: Vec<_> = s.iter().collect();
 151     check(&v, || &s);
 152 }
 153
 154 #[test]
 155 fn slice_iter_mut() {
 156     let mut s: Vec<_> = (0..10).collect();
 157     let mut v: Vec<_> = s.clone();
 158     let expected: Vec<_> = v.iter_mut().collect();
 159
 160     map_triples(expected.len() + 1, |i, j, k| {
 161         Split::forward(s.par_iter_mut(), i, j, k, &expected);
 162         Split::reverse(s.par_iter_mut(), i, j, k, &expected);
 163     });
 164 }
 165
 166 #[test]
 167 fn slice_chunks() {
 168     let s: Vec<_> = (0..10).collect();
 169     for len in 1..s.len() + 2 {
 170         let v: Vec<_> = s.chunks(len).collect();
 171         check(&v, || s.par_chunks(len));
 172     }
 173 }
 174
 175 #[test]
 176 fn slice_chunks_mut() {
 177     let mut s: Vec<_> = (0..10).collect();
 178     let mut v: Vec<_> = s.clone();
 179     for len in 1..s.len() + 2 {
 180         let expected: Vec<_> = v.chunks_mut(len).collect();
 181         map_triples(expected.len() + 1, |i, j, k| {
 182             Split::forward(s.par_chunks_mut(len), i, j, k, &expected);
 183             Split::reverse(s.par_chunks_mut(len), i, j, k, &expected);
 184         });
 185     }
 186 }
 187
 188 #[test]
 189 fn slice_windows() {
 190     let s: Vec<_> = (0..10).collect();
 191     let v: Vec<_> = s.windows(2).collect();
 192     check(&v, || s.par_windows(2));
 193 }
 194
 195 #[test]
 196 fn vec() {
 197     let v: Vec<_> = (0..10).collect();
 198     check(&v, || v.clone());
 199 }
 200
 201 // **** Adaptors ****
 202
 203 #[test]
 204 fn chain() {
 205     let v: Vec<_> = (0..10).collect();
 206     check(&v, || (0..5).into_par_iter().chain(5..10));
 207 }
 208
 209 #[test]
 210 fn cloned() {
 211     let v: Vec<_> = (0..10).collect();
 212     check(&v, || v.par_iter().cloned());
 213 }
 214
 215 #[test]
 216 fn copied() {
 217     let v: Vec<_> = (0..10).collect();
 218     check(&v, || v.par_iter().copied());
 219 }
 220
 221 #[test]
 222 fn enumerate() {
 223     let v: Vec<_> = (0..10).enumerate().collect();
 224     check(&v, || (0..10).into_par_iter().enumerate());
 225 }
 226
 227 #[test]
 228 fn inspect() {
 229     let v: Vec<_> = (0..10).collect();
 230     check(&v, || (0..10).into_par_iter().inspect(|_| ()));
 231 }
 232
 233 #[test]
 234 fn update() {
 235     let v: Vec<_> = (0..10).collect();
 236     check(&v, || (0..10).into_par_iter().update(|_| ()));
 237 }
 238
 239 #[test]
 240 fn interleave() {
 241     let v = [0, 10, 1, 11, 2, 12, 3, 4];
 242     check(&v, || (0..5).into_par_iter().interleave(10..13));
 243     check(&v[..6], || (0..3).into_par_iter().interleave(10..13));
 244
 245     let v = [0, 10, 1, 11, 2, 12, 13, 14];
 246     check(&v, || (0..3).into_par_iter().interleave(10..15));
 247 }
 248
 249 #[test]
 250 fn intersperse() {
 251     let v = [0, -1, 1, -1, 2, -1, 3, -1, 4];
 252     check(&v, || (0..5).into_par_iter().intersperse(-1));
 253 }
 254
 255 #[test]
 256 fn chunks() {
 257     let s: Vec<_> = (0..10).collect();
 258     let v: Vec<_> = s.chunks(2).map(|c| c.to_vec()).collect();
 259     check(&v, || s.par_iter().cloned().chunks(2));
 260 }
 261
 262 #[test]
 263 fn map() {
 264     let v: Vec<_> = (0..10).collect();
 265     check(&v, || v.par_iter().map(Clone::clone));
 266 }
 267
 268 #[test]
 269 fn map_with() {
 270     let v: Vec<_> = (0..10).collect();
 271     check(&v, || v.par_iter().map_with(vec![0], |_, &x| x));
 272 }
 273
 274 #[test]
 275 fn map_init() {
 276     let v: Vec<_> = (0..10).collect();
 277     check(&v, || v.par_iter().map_init(|| vec![0], |_, &x| x));
 278 }
 279
 280 #[test]
 281 fn panic_fuse() {
 282     let v: Vec<_> = (0..10).collect();
 283     check(&v, || (0..10).into_par_iter().panic_fuse());
 284 }
 285
 286 #[test]
 287 fn rev() {
 288     let v: Vec<_> = (0..10).rev().collect();
 289     check(&v, || (0..10).into_par_iter().rev());
 290 }
 291
 292 #[test]
 293 fn with_max_len() {
 294     let v: Vec<_> = (0..10).collect();
 295     check(&v, || (0..10).into_par_iter().with_max_len(1));
 296 }
 297
 298 #[test]
 299 fn with_min_len() {
 300     let v: Vec<_> = (0..10).collect();
 301     check(&v, || (0..10).into_par_iter().with_min_len(1));
 302 }
 303
 304 #[test]
 305 fn zip() {
 306     let v: Vec<_> = (0..10).zip(10..20).collect();
 307     check(&v, || (0..10).into_par_iter().zip(10..20));
 308     check(&v[..5], || (0..5).into_par_iter().zip(10..20));
 309     check(&v[..5], || (0..10).into_par_iter().zip(10..15));
 310 }