29 lines
9.5 KiB
Plaintext
29 lines
9.5 KiB
Plaintext
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!<arch>
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/ 0 0 0 0 8 `
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// 70 `
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equivalent-7507eaa528d55517.equivalent.510e206d548c7c3-cgu.0.rcgu.o/
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lib.rmeta/ 0 0 0 644 8728 `
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ELF · ˜ @ @ GNU À rust
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c #rustc 1.96.0 (ac68faa20 2026-05-25)ÁíàÄTËŸ ÜJîÄ)'ß\¥! -3d1337db07d0b3aeÁ ¤°ð ¾ä-±($²ï=©Ã -7e98a21bfd32b0edÁ‰ í
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EquivalentÁ œ
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equivalentÁ ¢ œ º
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ComparableÁ œ compareÁ ¢ œ ü
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¢œ ÅË d¸ 4¼
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¢ËÅ ¸ D¼ ü¤! l¤
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·ßÅÅ $² U . Ë üôW $• Å ,‚ Ë ‰ ô keyÁ" Q ýÌ ¢ d¶ 4º ý ¶ Dº ä§ D§
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»Å $° G ) É üöS ¿ßÀßÁß LessÁ Âß ÃßÄß~ Åß ÆßÇß GreaterÁ Èß åºÝÈnûê7 D” ô ,� € ˆ ô í £ © ý �ö í Y4Ü ®Dó ¿ß ü Ë ü L I [`Equivalent`] and [`Comparable`] are traits for key comparison in maps.Á M ú üQM J These may be used in the implementation of maps where the lookup type `Q`Á üŸ2 / may be different than the stored key type `K`.Á Ò ú üÖL I * `Q: Equivalent<K>` checks for equality, similar to the `HashMap<K, V>`Á ü£' $ constraint `K: Borrow<Q>, Q: Eq`.Á üËM J * `Q: Comparable<K>` checks the ordering, similar to the `BTreeMap<K, V>`Á ü™( % constraint `K: Borrow<Q>, Q: Ord`.Á  ú üÆO L These traits are not used by the maps in the standard library, but they mayÁ ü–J G add more flexibility in third-party map implementations, especially inÁ üáK H situations where a strict `K: Borrow<Q>` relationship is not available.Á ú t± # ExamplesÁ À ú <Ä ```Á ´Ì use equivalent::*;Á Üã use std::cmp::Ordering;Á ÿ ú üƒ( % pub struct Pair<A, B>(pub A, pub B);Á ¬ ú ü°R O impl<'a, A: ?Sized, B: ?Sized, C, D> Equivalent<(C, D)> for Pair<&'a A, &'a B>Á Lƒ whereÁ Ì� A: Equivalent<C>,Á ̧ B: Equivalent<D>,Á ,Á {Á üÇ4 1 fn equivalent(&self, key: &(C, D)) -> bool {Á üüB ? self.0.equivalent(&key.0) && self.1.equivalent(&key.1)Á L¿ }Á ,É }Á Ï ú üÓR O impl<'a, A: ?Sized, B: ?Sized, C, D> Comparable<(C, D)> for Pair<&'a A, &'a B>Á L¦ ý Ì° A: Comparable<C>,Á ÌÊ B: Comparable<D>,Á ,ä Ó üê 5 2 fn compare(&self, key: &(C, D)) -> Ordering {Á ü
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* ' match self.0.compare(&key.0) {Á üË
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: 7 Ordering::Equal => self.1.compare(&key.1),Á ü† ' $ not_equal => not_equal,Á l®
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}Á L¼ ë ,Æ ý Ì ú |Ð fn main() {Á üà = : let key = (String::from("foo"), String::from("bar"));Á üž $ ! let q1 = Pair("foo", "bar");Á üà $ ! let q2 = Pair("boo", "bar");Á üè $ ! let q3 = Pair("foo", "baz");Á �
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ú ü‘
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% " assert!(q1.equivalent(&key));Á ü·
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& # assert!(!q2.equivalent(&key));Á üÞ
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& # assert!(!q3.equivalent(&key));Á … ú ü‰6 3 assert_eq!(q1.compare(&key), Ordering::Equal);Á üÀ5 2 assert_eq!(q2.compare(&key), Ordering::Less);Á üö8 5 assert_eq!(q3.compare(&key), Ordering::Greater);Á ,¯ ý <µ „ íw Y† ®™ ¿ß w¤Î †œè ™üû Ôþ Key equivalence trait.Á ™ ú ü�L I This trait allows hash table lookup to be customized. It has one blanketÁ üêN K implementation that uses the regular solution with `Borrow` and `Eq`, justÁ ü¹N K like `HashMap` does, so that you can pass `&str` to lookup into a map withÁ äˆ `String` keys and so on.Á ¥ ú t© # ContractÁ ¸ ú ü¼> ; The implementor **must** hash like `K`, if it is hashable.Á T… œ Îì üû‘ ÎìË � ž ( ž - $& üä& ü¡> ; Compare self to `key` and return `true` if they are equal.ÁTç ¦ Ë ò
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