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Add insert_same extension to HashMap

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This commit is contained in:
John Kåre Alsaker 2018-04-01 10:25:16 +02:00
parent e5a602e364
commit 60d0cbe532
1 changed files with 14 additions and 0 deletions
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14
src/librustc_data_structures/sync.rs
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@ -29,6 +29,8 @@
//! `rustc_erase_owner!` erases a OwningRef owner into Erased or Erased + Send + Sync //! `rustc_erase_owner!` erases a OwningRef owner into Erased or Erased + Send + Sync
//! depending on the value of cfg!(parallel_queries). //! depending on the value of cfg!(parallel_queries).
use std::collections::HashMap;
use std::hash::{Hash, BuildHasher};
use std::cmp::Ordering; use std::cmp::Ordering;
use std::fmt::Debug; use std::fmt::Debug;
use std::fmt::Formatter; use std::fmt::Formatter;
@ -227,6 +229,18 @@ pub fn assert_sync<T: ?Sized + Sync>() {}
pub fn assert_send_val<T: ?Sized + Send>(_t: &T) {} pub fn assert_send_val<T: ?Sized + Send>(_t: &T) {}
pub fn assert_send_sync_val<T: ?Sized + Sync + Send>(_t: &T) {} pub fn assert_send_sync_val<T: ?Sized + Sync + Send>(_t: &T) {}
pub trait HashMapExt<K, V> {
/// Same as HashMap::insert, but it may panic if there's already an
/// entry for `key` with a value not equal to `value`
fn insert_same(&mut self, key: K, value: V);
}
impl<K: Eq + Hash, V: Eq, S: BuildHasher> HashMapExt<K, V> for HashMap<K, V, S> {
fn insert_same(&mut self, key: K, value: V) {
self.entry(key).and_modify(|old| assert!(*old == value)).or_insert(value);
}
}
impl<T: Copy + Debug> Debug for LockCell<T> { impl<T: Copy + Debug> Debug for LockCell<T> {
fn fmt(&self, f: &mut Formatter) -> fmt::Result { fn fmt(&self, f: &mut Formatter) -> fmt::Result {
f.debug_struct("LockCell") f.debug_struct("LockCell")