use core::num::NonZeroUsize; use super::*; #[test] fn test_range() { assert_eq!((0..5).collect::>(), [0, 1, 2, 3, 4]); assert_eq!((-10..-1).collect::>(), [-10, -9, -8, -7, -6, -5, -4, -3, -2]); assert_eq!((0..5).rev().collect::>(), [4, 3, 2, 1, 0]); assert_eq!((200..-5).count(), 0); assert_eq!((200..-5).rev().count(), 0); assert_eq!((200..200).count(), 0); assert_eq!((200..200).rev().count(), 0); assert_eq!((0..100).size_hint(), (100, Some(100))); // this test is only meaningful when sizeof usize < sizeof u64 assert_eq!((usize::MAX - 1..usize::MAX).size_hint(), (1, Some(1))); assert_eq!((-10..-1).size_hint(), (9, Some(9))); assert_eq!((-1..-10).size_hint(), (0, Some(0))); assert_eq!((-70..58).size_hint(), (128, Some(128))); assert_eq!((-128..127).size_hint(), (255, Some(255))); assert_eq!( (-2..isize::MAX).size_hint(), (isize::MAX as usize + 2, Some(isize::MAX as usize + 2)) ); } #[test] fn test_char_range() { // Miri is too slow let from = if cfg!(miri) { char::from_u32(0xD800 - 10).unwrap() } else { '\0' }; let to = if cfg!(miri) { char::from_u32(0xDFFF + 10).unwrap() } else { char::MAX }; assert!((from..=to).eq((from as u32..=to as u32).filter_map(char::from_u32))); assert!((from..=to).rev().eq((from as u32..=to as u32).filter_map(char::from_u32).rev())); assert_eq!(('\u{D7FF}'..='\u{E000}').count(), 2); assert_eq!(('\u{D7FF}'..='\u{E000}').size_hint(), (2, Some(2))); assert_eq!(('\u{D7FF}'..'\u{E000}').count(), 1); assert_eq!(('\u{D7FF}'..'\u{E000}').size_hint(), (1, Some(1))); } #[test] fn test_range_exhaustion() { let mut r = 10..10; assert!(r.is_empty()); assert_eq!(r.next(), None); assert_eq!(r.next_back(), None); assert_eq!(r, 10..10); let mut r = 10..12; assert_eq!(r.next(), Some(10)); assert_eq!(r.next(), Some(11)); assert!(r.is_empty()); assert_eq!(r, 12..12); assert_eq!(r.next(), None); let mut r = 10..12; assert_eq!(r.next_back(), Some(11)); assert_eq!(r.next_back(), Some(10)); assert!(r.is_empty()); assert_eq!(r, 10..10); assert_eq!(r.next_back(), None); let mut r = 100..10; assert!(r.is_empty()); assert_eq!(r.next(), None); assert_eq!(r.next_back(), None); assert_eq!(r, 100..10); } #[test] fn test_range_inclusive_exhaustion() { let mut r = 10..=10; assert_eq!(r.next(), Some(10)); assert!(r.is_empty()); assert_eq!(r.next(), None); assert_eq!(r.next(), None); assert_eq!(*r.start(), 10); assert_eq!(*r.end(), 10); assert_ne!(r, 10..=10); let mut r = 10..=10; assert_eq!(r.next_back(), Some(10)); assert!(r.is_empty()); assert_eq!(r.next_back(), None); assert_eq!(*r.start(), 10); assert_eq!(*r.end(), 10); assert_ne!(r, 10..=10); let mut r = 10..=12; assert_eq!(r.next(), Some(10)); assert_eq!(r.next(), Some(11)); assert_eq!(r.next(), Some(12)); assert!(r.is_empty()); assert_eq!(r.next(), None); let mut r = 10..=12; assert_eq!(r.next_back(), Some(12)); assert_eq!(r.next_back(), Some(11)); assert_eq!(r.next_back(), Some(10)); assert!(r.is_empty()); assert_eq!(r.next_back(), None); let mut r = 10..=12; assert_eq!(r.nth(2), Some(12)); assert!(r.is_empty()); assert_eq!(r.next(), None); let mut r = 10..=12; assert_eq!(r.nth(5), None); assert!(r.is_empty()); assert_eq!(r.next(), None); let mut r = 100..=10; assert_eq!(r.next(), None); assert!(r.is_empty()); assert_eq!(r.next(), None); assert_eq!(r.next(), None); assert_eq!(r, 100..=10); let mut r = 100..=10; assert_eq!(r.next_back(), None); assert!(r.is_empty()); assert_eq!(r.next_back(), None); assert_eq!(r.next_back(), None); assert_eq!(r, 100..=10); } #[test] fn test_range_nth() { assert_eq!((10..15).nth(0), Some(10)); assert_eq!((10..15).nth(1), Some(11)); assert_eq!((10..15).nth(4), Some(14)); assert_eq!((10..15).nth(5), None); let mut r = 10..20; assert_eq!(r.nth(2), Some(12)); assert_eq!(r, 13..20); assert_eq!(r.nth(2), Some(15)); assert_eq!(r, 16..20); assert_eq!(r.nth(10), None); assert_eq!(r, 20..20); } #[test] fn test_range_nth_back() { assert_eq!((10..15).nth_back(0), Some(14)); assert_eq!((10..15).nth_back(1), Some(13)); assert_eq!((10..15).nth_back(4), Some(10)); assert_eq!((10..15).nth_back(5), None); assert_eq!((-120..80_i8).nth_back(199), Some(-120)); let mut r = 10..20; assert_eq!(r.nth_back(2), Some(17)); assert_eq!(r, 10..17); assert_eq!(r.nth_back(2), Some(14)); assert_eq!(r, 10..14); assert_eq!(r.nth_back(10), None); assert_eq!(r, 10..10); } #[test] fn test_range_from_nth() { assert_eq!((10..).nth(0), Some(10)); assert_eq!((10..).nth(1), Some(11)); assert_eq!((10..).nth(4), Some(14)); let mut r = 10..; assert_eq!(r.nth(2), Some(12)); assert_eq!(r, 13..); assert_eq!(r.nth(2), Some(15)); assert_eq!(r, 16..); assert_eq!(r.nth(10), Some(26)); assert_eq!(r, 27..); assert_eq!((0..).size_hint(), (usize::MAX, None)); } #[test] fn test_range_from_take() { let mut it = (0..).take(3); assert_eq!(it.next(), Some(0)); assert_eq!(it.next(), Some(1)); assert_eq!(it.next(), Some(2)); assert_eq!(it.next(), None); is_trusted_len((0..).take(3)); assert_eq!((0..).take(3).size_hint(), (3, Some(3))); assert_eq!((0..).take(0).size_hint(), (0, Some(0))); assert_eq!((0..).take(usize::MAX).size_hint(), (usize::MAX, Some(usize::MAX))); } #[test] fn test_range_from_take_collect() { let v: Vec<_> = (0..).take(3).collect(); assert_eq!(v, vec![0, 1, 2]); } #[test] fn test_range_inclusive_nth() { assert_eq!((10..=15).nth(0), Some(10)); assert_eq!((10..=15).nth(1), Some(11)); assert_eq!((10..=15).nth(5), Some(15)); assert_eq!((10..=15).nth(6), None); let mut exhausted_via_next = 10_u8..=20; while exhausted_via_next.next().is_some() {} let mut r = 10_u8..=20; assert_eq!(r.nth(2), Some(12)); assert_eq!(r, 13..=20); assert_eq!(r.nth(2), Some(15)); assert_eq!(r, 16..=20); assert_eq!(r.is_empty(), false); assert_eq!(ExactSizeIterator::is_empty(&r), false); assert_eq!(r.nth(10), None); assert_eq!(r.is_empty(), true); assert_eq!(r, exhausted_via_next); assert_eq!(ExactSizeIterator::is_empty(&r), true); } #[test] fn test_range_inclusive_nth_back() { assert_eq!((10..=15).nth_back(0), Some(15)); assert_eq!((10..=15).nth_back(1), Some(14)); assert_eq!((10..=15).nth_back(5), Some(10)); assert_eq!((10..=15).nth_back(6), None); assert_eq!((-120..=80_i8).nth_back(200), Some(-120)); let mut exhausted_via_next_back = 10_u8..=20; while exhausted_via_next_back.next_back().is_some() {} let mut r = 10_u8..=20; assert_eq!(r.nth_back(2), Some(18)); assert_eq!(r, 10..=17); assert_eq!(r.nth_back(2), Some(15)); assert_eq!(r, 10..=14); assert_eq!(r.is_empty(), false); assert_eq!(ExactSizeIterator::is_empty(&r), false); assert_eq!(r.nth_back(10), None); assert_eq!(r.is_empty(), true); assert_eq!(r, exhausted_via_next_back); assert_eq!(ExactSizeIterator::is_empty(&r), true); } #[test] fn test_range_len() { assert_eq!((0..10_u8).len(), 10); assert_eq!((9..10_u8).len(), 1); assert_eq!((10..10_u8).len(), 0); assert_eq!((11..10_u8).len(), 0); assert_eq!((100..10_u8).len(), 0); } #[test] fn test_range_inclusive_len() { assert_eq!((0..=10_u8).len(), 11); assert_eq!((9..=10_u8).len(), 2); assert_eq!((10..=10_u8).len(), 1); assert_eq!((11..=10_u8).len(), 0); assert_eq!((100..=10_u8).len(), 0); } #[test] fn test_range_step() { #![allow(deprecated)] assert_eq!((0..20).step_by(5).collect::>(), [0, 5, 10, 15]); assert_eq!((1..21).rev().step_by(5).collect::>(), [20, 15, 10, 5]); assert_eq!((1..21).rev().step_by(6).collect::>(), [20, 14, 8, 2]); assert_eq!((200..255).step_by(50).collect::>(), [200, 250]); assert_eq!((200..-5).step_by(1).collect::>(), []); assert_eq!((200..200).step_by(1).collect::>(), []); assert_eq!((0..20).step_by(1).size_hint(), (20, Some(20))); assert_eq!((0..20).step_by(21).size_hint(), (1, Some(1))); assert_eq!((0..20).step_by(5).size_hint(), (4, Some(4))); assert_eq!((1..21).rev().step_by(5).size_hint(), (4, Some(4))); assert_eq!((1..21).rev().step_by(6).size_hint(), (4, Some(4))); assert_eq!((20..-5).step_by(1).size_hint(), (0, Some(0))); assert_eq!((20..20).step_by(1).size_hint(), (0, Some(0))); assert_eq!((i8::MIN..i8::MAX).step_by(-(i8::MIN as i32) as usize).size_hint(), (2, Some(2))); assert_eq!((i16::MIN..i16::MAX).step_by(i16::MAX as usize).size_hint(), (3, Some(3))); assert_eq!((isize::MIN..isize::MAX).step_by(1).size_hint(), (usize::MAX, Some(usize::MAX))); } #[test] fn test_range_advance_by() { let mut r = 0..usize::MAX; assert_eq!(Ok(()), r.advance_by(0)); assert_eq!(Ok(()), r.advance_back_by(0)); assert_eq!(r.len(), usize::MAX); assert_eq!(Ok(()), r.advance_by(1)); assert_eq!(Ok(()), r.advance_back_by(1)); assert_eq!((r.start, r.end), (1, usize::MAX - 1)); assert_eq!(Err(NonZeroUsize::new(2).unwrap()), r.advance_by(usize::MAX)); assert_eq!(Ok(()), r.advance_by(0)); assert_eq!(Ok(()), r.advance_back_by(0)); let mut r = 0u128..u128::MAX; assert_eq!(Ok(()), r.advance_by(usize::MAX)); assert_eq!(Ok(()), r.advance_back_by(usize::MAX)); assert_eq!((r.start, r.end), (0u128 + usize::MAX as u128, u128::MAX - usize::MAX as u128)); } #[test] fn test_range_inclusive_step() { assert_eq!((0..=50).step_by(10).collect::>(), [0, 10, 20, 30, 40, 50]); assert_eq!((0..=5).step_by(1).collect::>(), [0, 1, 2, 3, 4, 5]); assert_eq!((200..=255u8).step_by(10).collect::>(), [200, 210, 220, 230, 240, 250]); assert_eq!((250..=255u8).step_by(1).collect::>(), [250, 251, 252, 253, 254, 255]); } #[test] fn test_range_last_max() { assert_eq!((0..20).last(), Some(19)); assert_eq!((-20..0).last(), Some(-1)); assert_eq!((5..5).last(), None); assert_eq!((0..20).max(), Some(19)); assert_eq!((-20..0).max(), Some(-1)); assert_eq!((5..5).max(), None); } #[test] fn test_range_inclusive_last_max() { assert_eq!((0..=20).last(), Some(20)); assert_eq!((-20..=0).last(), Some(0)); assert_eq!((5..=5).last(), Some(5)); let mut r = 10..=10; r.next(); assert_eq!(r.last(), None); assert_eq!((0..=20).max(), Some(20)); assert_eq!((-20..=0).max(), Some(0)); assert_eq!((5..=5).max(), Some(5)); let mut r = 10..=10; r.next(); assert_eq!(r.max(), None); } #[test] fn test_range_min() { assert_eq!((0..20).min(), Some(0)); assert_eq!((-20..0).min(), Some(-20)); assert_eq!((5..5).min(), None); } #[test] fn test_range_inclusive_min() { assert_eq!((0..=20).min(), Some(0)); assert_eq!((-20..=0).min(), Some(-20)); assert_eq!((5..=5).min(), Some(5)); let mut r = 10..=10; r.next(); assert_eq!(r.min(), None); } #[test] fn test_range_inclusive_folds() { assert_eq!((1..=10).sum::(), 55); assert_eq!((1..=10).rev().sum::(), 55); let mut it = 44..=50; assert_eq!(it.try_fold(0, i8::checked_add), None); assert_eq!(it, 47..=50); assert_eq!(it.try_fold(0, i8::checked_add), None); assert_eq!(it, 50..=50); assert_eq!(it.try_fold(0, i8::checked_add), Some(50)); assert!(it.is_empty()); assert_eq!(it.try_fold(0, i8::checked_add), Some(0)); assert!(it.is_empty()); let mut it = 40..=47; assert_eq!(it.try_rfold(0, i8::checked_add), None); assert_eq!(it, 40..=44); assert_eq!(it.try_rfold(0, i8::checked_add), None); assert_eq!(it, 40..=41); assert_eq!(it.try_rfold(0, i8::checked_add), Some(81)); assert!(it.is_empty()); assert_eq!(it.try_rfold(0, i8::checked_add), Some(0)); assert!(it.is_empty()); let mut it = 10..=20; assert_eq!(it.try_fold(0, |a, b| Some(a + b)), Some(165)); assert!(it.is_empty()); assert_eq!(it.try_fold(0, |a, b| Some(a + b)), Some(0)); assert!(it.is_empty()); let mut it = 10..=20; assert_eq!(it.try_rfold(0, |a, b| Some(a + b)), Some(165)); assert!(it.is_empty()); assert_eq!(it.try_rfold(0, |a, b| Some(a + b)), Some(0)); assert!(it.is_empty()); } #[test] fn test_range_size_hint() { assert_eq!((0..0usize).size_hint(), (0, Some(0))); assert_eq!((0..100usize).size_hint(), (100, Some(100))); assert_eq!((0..usize::MAX).size_hint(), (usize::MAX, Some(usize::MAX))); let umax = u128::try_from(usize::MAX).unwrap(); assert_eq!((0..0u128).size_hint(), (0, Some(0))); assert_eq!((0..100u128).size_hint(), (100, Some(100))); assert_eq!((0..umax).size_hint(), (usize::MAX, Some(usize::MAX))); assert_eq!((0..umax + 1).size_hint(), (usize::MAX, None)); assert_eq!((0..0isize).size_hint(), (0, Some(0))); assert_eq!((-100..100isize).size_hint(), (200, Some(200))); assert_eq!((isize::MIN..isize::MAX).size_hint(), (usize::MAX, Some(usize::MAX))); let imin = i128::try_from(isize::MIN).unwrap(); let imax = i128::try_from(isize::MAX).unwrap(); assert_eq!((0..0i128).size_hint(), (0, Some(0))); assert_eq!((-100..100i128).size_hint(), (200, Some(200))); assert_eq!((imin..imax).size_hint(), (usize::MAX, Some(usize::MAX))); assert_eq!((imin..imax + 1).size_hint(), (usize::MAX, None)); } #[test] fn test_range_inclusive_size_hint() { assert_eq!((1..=0usize).size_hint(), (0, Some(0))); assert_eq!((0..=0usize).size_hint(), (1, Some(1))); assert_eq!((0..=100usize).size_hint(), (101, Some(101))); assert_eq!((0..=usize::MAX - 1).size_hint(), (usize::MAX, Some(usize::MAX))); assert_eq!((0..=usize::MAX).size_hint(), (usize::MAX, None)); let umax = u128::try_from(usize::MAX).unwrap(); assert_eq!((1..=0u128).size_hint(), (0, Some(0))); assert_eq!((0..=0u128).size_hint(), (1, Some(1))); assert_eq!((0..=100u128).size_hint(), (101, Some(101))); assert_eq!((0..=umax - 1).size_hint(), (usize::MAX, Some(usize::MAX))); assert_eq!((0..=umax).size_hint(), (usize::MAX, None)); assert_eq!((0..=umax + 1).size_hint(), (usize::MAX, None)); assert_eq!((0..=-1isize).size_hint(), (0, Some(0))); assert_eq!((0..=0isize).size_hint(), (1, Some(1))); assert_eq!((-100..=100isize).size_hint(), (201, Some(201))); assert_eq!((isize::MIN..=isize::MAX - 1).size_hint(), (usize::MAX, Some(usize::MAX))); assert_eq!((isize::MIN..=isize::MAX).size_hint(), (usize::MAX, None)); let imin = i128::try_from(isize::MIN).unwrap(); let imax = i128::try_from(isize::MAX).unwrap(); assert_eq!((0..=-1i128).size_hint(), (0, Some(0))); assert_eq!((0..=0i128).size_hint(), (1, Some(1))); assert_eq!((-100..=100i128).size_hint(), (201, Some(201))); assert_eq!((imin..=imax - 1).size_hint(), (usize::MAX, Some(usize::MAX))); assert_eq!((imin..=imax).size_hint(), (usize::MAX, None)); assert_eq!((imin..=imax + 1).size_hint(), (usize::MAX, None)); } #[test] fn test_double_ended_range() { assert_eq!((11..14).rev().collect::>(), [13, 12, 11]); for _ in (10..0).rev() { panic!("unreachable"); } assert_eq!((11..14).rev().collect::>(), [13, 12, 11]); for _ in (10..0).rev() { panic!("unreachable"); } }