bjoernager/rust
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Clarify dst condition

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This commit is contained in:
Pazzaz 2018-08-14 20:56:22 +02:00
parent 8d3554c48d
commit ae0f254311
1 changed files with 8 additions and 8 deletions
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16
src/liballoc/collections/vec_deque.rs
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@ -1882,18 +1882,18 @@ impl<T> VecDeque<T> {
// Values are not copied one by one but as slices in `copy_whole_slice`.
// What slices are used depends on various properties of src and dst.
// There are 6 cases in total:
// 1. `src` and `dst` are contiguous
// 2. `src` is contiguous and `dst` is discontiguous
// 3. `src` is discontiguous and `dst` is contiguous
// 4. `src` and `dst` are discontiguous
// 1. `src` is contiguous and fits in dst_high
// 2. `src` is contiguous and does not fit in dst_high
// 3. `src` is discontiguous and fits in dst_high
// 4. `src` is discontiguous and does not fit in dst_high
// + src_high is smaller than dst_high
// 5. `src` and `dst` are discontiguous
// 5. `src` is discontiguous and does not fit in dst_high
// + dst_high is smaller than src_high
// 6. `src` and `dst` are discontiguous
// 6. `src` is discontiguous and does not fit in dst_high
// + dst_high is the same size as src_high
let src_contiguous = src_low.is_empty();
let dst_contiguous = dst_high.len() >= src_total;
match (src_contiguous, dst_contiguous) {
let dst_high_fits_src = dst_high.len() >= src_total;
match (src_contiguous, dst_high_fits_src) {
(true, true) => {
// 1.
// other [. . . o o o . . . . . .]