51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
#![cfg(feature = "use_alloc")]
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use alloc::{vec, vec::Vec};
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use std::cmp::Ordering;
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/// Implementation guts for `min_set`, `min_set_by`, and `min_set_by_key`.
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pub fn min_set_impl<I, K, F, Compare>(
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mut it: I,
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mut key_for: F,
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mut compare: Compare,
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) -> Vec<I::Item>
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where
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I: Iterator,
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F: FnMut(&I::Item) -> K,
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Compare: FnMut(&I::Item, &I::Item, &K, &K) -> Ordering,
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{
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match it.next() {
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None => Vec::new(),
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Some(element) => {
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let mut current_key = key_for(&element);
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let mut result = vec![element];
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it.for_each(|element| {
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let key = key_for(&element);
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match compare(&element, &result[0], &key, ¤t_key) {
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Ordering::Less => {
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result.clear();
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result.push(element);
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current_key = key;
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}
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Ordering::Equal => {
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result.push(element);
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}
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Ordering::Greater => {}
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}
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});
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result
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}
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}
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}
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/// Implementation guts for `ax_set`, `max_set_by`, and `max_set_by_key`.
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pub fn max_set_impl<I, K, F, Compare>(it: I, key_for: F, mut compare: Compare) -> Vec<I::Item>
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where
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I: Iterator,
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F: FnMut(&I::Item) -> K,
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Compare: FnMut(&I::Item, &I::Item, &K, &K) -> Ordering,
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{
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min_set_impl(it, key_for, |it1, it2, key1, key2| {
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compare(it2, it1, key2, key1)
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})
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}
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