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Github Tracking Issue for {HashMap,BTreeMap}::into_{keys,values} · Issue #75294...

 3 years ago
source link: https://github.com/rust-lang/rust/issues/75294
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canova commented on Aug 8, 2020 •

edited by m-ou-se

Feature gate: #![feature(map_into_keys_values)]

This is a tracking issue for {HashMap,BTreeMap}::into_{keys,values}.

Public API

// alloc::collections::btree_map

impl<K, V> BTreeMap<K, V> {
    pub fn into_keys(self) -> IntoKeys<K, V>;
    pub fn into_values(self) -> IntoValues<K, V>;
}

pub struct IntoKeys<K, V>;
pub struct IntoValues<K, V>;

impl<K, V> Iterator for IntoKeys<K, V> { type Item = K; }
impl<K, V> DoubleEndedIterator for IntoKeys<K, V> {}
impl<K, V> ExactSizeIterator for IntoKeys<K, V> {}
impl<K, V> FusedIterator for IntoKeys<K, V> {}
impl<K: Debug, V> Debug for IntoKeys<K, V> {}

impl<K, V> Iterator for IntoValues<K, V> { type Item = V; }
impl<K, V> DoubleEndedIterator for IntoValues<K, V> {}
impl<K, V> ExactSizeIterator for IntoValues<K, V> {}
impl<K, V> FusedIterator for IntoValues<K, V> {}
impl<K, V: Debug> Debug for IntoValues<K, V> {}

// alloc::collections::hash_map

impl<K: Eq + Hash, V, S: BuildHasher> HashMap<K, V, S> {
    pub fn into_keys(self) -> IntoKeys<K, V>;
    pub fn into_values(self) -> IntoValues<K, V>;
}

pub struct IntoKeys<K, V>;
pub struct IntoValues<K, V>;

impl<K, V> Iterator for IntoKeys<K, V> { type Item = K; }
impl<K, V> ExactSizeIterator for IntoKeys<K, V> {}
impl<K, V> FusedIterator for IntoKeys<K, V> {}
impl<K: Debug, V> Debug for IntoKeys<K, V> {}

impl<K, V> Iterator for IntoValues<K, V> { type Item = V; }
impl<K, V> ExactSizeIterator for IntoValues<K, V> {}
impl<K, V> FusedIterator for IntoValues<K, V> {}
impl<K, V: Debug> Debug for IntoValues<K, V> {}

Steps / History

  • Requested in #55214.
  • Implementation: #75163
  • Final commenting period (FCP)
  • Stabilization PR: #84328

Unresolved Questions

  • None yet.

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