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Rollup merge of #78083 - ChaiTRex:master, r=m-ou-se

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Stabilize or_insert_with_key

Stabilizes the `or_insert_with_key` feature from https://github.com/rust-lang/rust/issues/71024. This allows inserting key-derived values when a `HashMap`/`BTreeMap` entry is vacant.

The difference between this and  `.or_insert_with(|| ... )` is that this provides a reference to the key to the closure after it is moved with `.entry(key_being_moved)`, avoiding the need to copy or clone the key.
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Yuki Okushi 2020-12-19 15:15:57 +09:00 • committed by GitHub
commit 0765536c0b
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3 changed files with 15 additions and 11 deletions
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compiler/rustc_data_structures/src/sso/map.rs
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@ -40,7 +40,7 @@ const SSO_ARRAY_SIZE: usize = 8;
// into_keys/into_values (unstable)
// all raw_entry-related
// PartialEq/Eq (requires sorting the array)
// Entry::or_insert_with_key (unstable)
// Entry::or_insert_with_key
// Vacant/Occupied entries and related
//
// FIXME: In HashMap most methods accepting key reference