Trait indexmap::set::MutableValues
source · pub trait MutableValues: Sealed {
type Value;
// Required methods
fn get_full_mut2<Q>(
&mut self,
value: &Q,
) -> Option<(usize, &mut Self::Value)>
where Q: ?Sized + Hash + Equivalent<Self::Value>;
fn get_index_mut2(&mut self, index: usize) -> Option<&mut Self::Value>;
fn retain2<F>(&mut self, keep: F)
where F: FnMut(&mut Self::Value) -> bool;
}
Expand description
Opt-in mutable access to IndexSet
values.
These methods expose &mut T
, mutable references to the value as it is stored
in the set.
You are allowed to modify the values in the set if the modification
does not change the value’s hash and equality.
If values are modified erroneously, you can no longer look them up.
This is sound (memory safe) but a logical error hazard (just like
implementing PartialEq
, Eq
, or Hash
incorrectly would be).
use
this trait to enable its methods for IndexSet
.
This trait is sealed and cannot be implemented for types outside this crate.
Required Associated Types§
Required Methods§
sourcefn get_full_mut2<Q>(&mut self, value: &Q) -> Option<(usize, &mut Self::Value)>
fn get_full_mut2<Q>(&mut self, value: &Q) -> Option<(usize, &mut Self::Value)>
Return item index and mutable reference to the value
Computes in O(1) time (average).
sourcefn get_index_mut2(&mut self, index: usize) -> Option<&mut Self::Value>
fn get_index_mut2(&mut self, index: usize) -> Option<&mut Self::Value>
Return mutable reference to the value at an index.
Valid indices are 0 <= index < self.len()
.
Computes in O(1) time.
Object Safety§
Implementors§
source§impl<T, S> MutableValues for IndexSet<T, S>where
S: BuildHasher,
impl<T, S> MutableValues for IndexSet<T, S>where
S: BuildHasher,
Opt-in mutable access to IndexSet
values.
See MutableValues
for more information.