unique_hash_key_with

Synopsis

Declared in <folly/hash/UniqueHashKey.h>

template<auto Algo>
class unique_hash_key_with
    : public unique_hash_key<unique_hash_key_algo_size_v<Algo>>

Description

A unique‐hash‐key of the size returned by the given hash algorithm, using the given algorithm.

Hash values are unique to the process. But see the caveats regarding uniqueness above, with tuples replacing packs.

It is explicitly permitted to copy‐construct unique_hash_key (base class) instances from instances of unique_hash_key_with<Algo> (derived class). There is no concern about object slicing.

Base Classes

Name

Description

unique_hash_key<unique_hash_key_algo_size_v<Algo>>

unique_hash_key

Member Functions

Name

Description

unique_hash_key_with [constructor]

Construct the key by hashing the elements of the given tuple.

operator std::span<T const, E>

View the key bytes as a std::span of unsigned integers.

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