pub struct Hashed<V, H = FixedState> { /* private fields */ }
Expand description
A pre-hashed value of a specific type. Pre-hashing enables memoization of hashes that are expensive to compute.
It also enables faster PartialEq
comparisons by short circuiting on hash equality.
See PassHash
and PassHasher
for a “pass through” BuildHasher
and Hasher
implementation
designed to work with Hashed
See PreHashMap
for a hashmap pre-configured to use Hashed
keys.
Performs copy-assignment from
source
.
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Formats the value using the given formatter.
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The resulting type after dereferencing.
Dereferences the value.
A fast impl of PartialEq
that first checks that other
’s pre-computed hash
matches this value’s pre-computed hash.
This method tests for
!=
. The default implementation is almost always
sufficient, and should not be overridden without very good reason.
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Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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Returns the argument unchanged.
Instruments this type with the provided
Span
, returning an
Instrumented
wrapper.
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Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning.
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Uses borrowed data to replace owned data, usually by cloning.
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The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.