comparison: src/maputil.rs
src/maputil.rs
- changeset 90
- b3c35d16affe
- parent 55
- 7b2ee3e84c5f
- child 91
- db870f2a2cde
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| 25:d14c877e14b7 | 90:b3c35d16affe |
|---|---|
| 1 /*! | 1 /*! |
| 2 Utilities for mapping over various container types. | 2 Utilities for mapping over various container types. |
| 3 */ | 3 */ |
| 4 | 4 |
| 5 #[cfg(feature = "nightly")] | |
| 5 use std::mem::MaybeUninit; | 6 use std::mem::MaybeUninit; |
| 6 use itertools::izip; | 7 use itertools::izip; |
| 7 | 8 |
| 8 /// Trait for a fixed-length container type. | 9 /// Trait for a fixed-length container type. |
| 9 /// | 10 /// |
| 320 /// `next` at most `N` times, the iterator can still be used afterwards to | 321 /// `next` at most `N` times, the iterator can still be used afterwards to |
| 321 /// retrieve the remaining items. | 322 /// retrieve the remaining items. |
| 322 /// | 323 /// |
| 323 /// If `iter.next()` panicks, all items already yielded by the iterator are | 324 /// If `iter.next()` panicks, all items already yielded by the iterator are |
| 324 /// dropped. | 325 /// dropped. |
| 326 #[cfg(feature = "nightly")] | |
| 325 #[inline] | 327 #[inline] |
| 326 pub(crate) fn collect_into_array_unchecked<T, I : Iterator<Item=T>, const N: usize>(mut iter: I) -> [T; N] | 328 pub(crate) fn collect_into_array_unchecked< |
| 329 T, | |
| 330 I : Iterator<Item=T>, | |
| 331 const N: usize | |
| 332 >(mut iter: I) -> [T; N] | |
| 327 { | 333 { |
| 328 if N == 0 { | 334 if N == 0 { |
| 329 // SAFETY: An empty array is always inhabited and has no validity invariants. | 335 // SAFETY: An empty array is always inhabited and has no validity invariants. |
| 330 return unsafe { core::mem::zeroed() }; | 336 return unsafe { core::mem::zeroed() }; |
| 331 } | 337 } |
| 373 } | 379 } |
| 374 | 380 |
| 375 unreachable!("Something went wrong with iterator length") | 381 unreachable!("Something went wrong with iterator length") |
| 376 } | 382 } |
| 377 | 383 |
| 384 #[cfg(not(feature = "nightly"))] | |
| 385 #[inline] | |
| 386 pub(crate) fn collect_into_array_unchecked< | |
| 387 T, | |
| 388 I : Iterator<Item=T>, | |
| 389 const N: usize | |
| 390 >(iter: I) -> [T; N] | |
| 391 { | |
| 392 match iter.collect::<Vec<T>>().try_into() { | |
| 393 Ok(a) => a, | |
| 394 Err(_) => panic!("collect_into_array failure: should not happen"), | |
| 395 } | |
| 396 } | |
| 378 | 397 |
| 379 #[cfg(test)] | 398 #[cfg(test)] |
| 380 mod tests { | 399 mod tests { |
| 381 use super::*; | 400 use super::*; |
| 382 | 401 |
