Hashes

Hashing functions. More...

Functions
template<bytelike_range RANGE>
constexpr uint32_t	ghassanpl::crc32 (RANGE &&bytes)
	Calculates a CRC32 for a range of bytelikes.
template<bytelike... BYTES>
constexpr uint32_t	ghassanpl::crc32 (BYTES... bytes)
	Calculates a CRC32 for a variadic number of bytelikes.
constexpr auto	ghassanpl::crc32 (const source_location &k)
	Calculates a CRC32 of a source_location (constexpr, so can be used at compile time)
template<bytelike_range RANGE>
constexpr uint64_t	ghassanpl::crc64 (RANGE &&bytes)
	Calculates a CRC4 for a range of bytelikes.
template<bytelike... BYTES>
constexpr uint64_t	ghassanpl::crc64 (BYTES... bytes)
	Calculates a CRC4 for a variadic number of bytelikes.
constexpr auto	ghassanpl::crc64 (const source_location &k)
	Calculates a CRC64 of a source_location (constexpr, so can be used at compile time)
template<bytelike_range RANGE>
constexpr uint64_t	ghassanpl::fnv64 (RANGE &&bytes)
	TODO: Add support for non-64bit hashes to all the functions below, especially since std::hash operates on size_t.
template<bytelike... BYTES>
constexpr uint64_t	ghassanpl::fnv64 (BYTES... bytes)
	Calculates a FNV Hash for a variadic number of bytes.
template<typename T , typename HASHER = std::hash<std::remove_cvref_t<T>>>
constexpr void	ghassanpl::hash64_combine_to (uint64_t &seed, T &&v, HASHER &&hasher=HASHER{})
	TODO: ce_hash64(array/span) TODO: ce_hash64(thread::id) ? TODO: ce_hash64(optional/variant) ?
template<typename It , typename HASHER = std::hash<std::iter_value_t<It>>>
constexpr void	ghassanpl::hash64_range (uint64_t &seed, It first, It last, HASHER const &hasher={})
	Combines an existing hash value (seed) with the hash of a range of values.
template<typename It , typename HASHER = std::hash<std::iter_value_t<It>>>
constexpr uint64_t	ghassanpl::hash64_range (It first, It last, HASHER &&hasher={})
	Hashes a range of values.
template<std::ranges::range T, typename HASHER = std::hash<std::ranges::range_value_t<T>>>
constexpr uint64_t	ghassanpl::hash64_range (T range, HASHER &&hasher={})
	Hashes a range of values.

Detailed Description

Hashing functions.

Function Documentation

crc32() [1/3]

template<bytelike... BYTES>

constexpr uint32_t ghassanpl::crc32 ( BYTES...  bytes )

constexpr

Calculates a CRC32 for a variadic number of bytelikes.

constexpr!

Definition at line 80 of file hashes.h.

crc32() [2/3]

constexpr auto ghassanpl::crc32 ( const source_location &  k )

constexpr

Calculates a CRC32 of a source_location (constexpr, so can be used at compile time)

Definition at line 89 of file hashes.h.

crc32() [3/3]

template<bytelike_range RANGE>

constexpr uint32_t ghassanpl::crc32 ( RANGE &&  bytes )

constexpr

Calculates a CRC32 for a range of bytelikes.

constexpr!

Definition at line 67 of file hashes.h.

crc64() [1/3]

template<bytelike... BYTES>

constexpr uint64_t ghassanpl::crc64 ( BYTES...  bytes )

constexpr

Calculates a CRC4 for a variadic number of bytelikes.

Definition at line 143 of file hashes.h.

crc64() [2/3]

constexpr auto ghassanpl::crc64 ( const source_location &  k )

constexpr

Calculates a CRC64 of a source_location (constexpr, so can be used at compile time)

Definition at line 152 of file hashes.h.

crc64() [3/3]

template<bytelike_range RANGE>

constexpr uint64_t ghassanpl::crc64 ( RANGE &&  bytes )

constexpr

Calculates a CRC4 for a range of bytelikes.

Definition at line 132 of file hashes.h.

fnv64() [1/2]

template<bytelike... BYTES>

constexpr uint64_t ghassanpl::fnv64 ( BYTES...  bytes )

constexpr

Calculates a FNV Hash for a variadic number of bytes.

Definition at line 179 of file hashes.h.

fnv64() [2/2]

template<bytelike_range RANGE>

constexpr uint64_t ghassanpl::fnv64 ( RANGE &&  bytes )

constexpr

TODO: Add support for non-64bit hashes to all the functions below, especially since std::hash operates on size_t.

Calculates a FNV Hash for a range of bytes

Definition at line 168 of file hashes.h.

hash64_combine_to()

template<typename T , typename HASHER = std::hash<std::remove_cvref_t<T>>>

constexpr void ghassanpl::hash64_combine_to ( uint64_t &  seed, T &&  v, HASHER &&  hasher = HASHER{}  )

constexpr

TODO: ce_hash64(array/span) TODO: ce_hash64(thread::id) ? TODO: ce_hash64(optional/variant) ?

Combines an existing hash value (seed) with the hash of value v

Definition at line 308 of file hashes.h.

hash64_range() [1/3]

template<typename It , typename HASHER = std::hash<std::iter_value_t<It>>>

constexpr uint64_t ghassanpl::hash64_range ( It  first, It  last, HASHER &&  hasher = {}  )

constexpr

Hashes a range of values.

Definition at line 343 of file hashes.h.

hash64_range() [2/3]

template<std::ranges::range T, typename HASHER = std::hash<std::ranges::range_value_t<T>>>

constexpr uint64_t ghassanpl::hash64_range ( T  range, HASHER &&  hasher = {}  )

constexpr

Hashes a range of values.

Definition at line 354 of file hashes.h.

hash64_range() [3/3]

template<typename It , typename HASHER = std::hash<std::iter_value_t<It>>>

constexpr void ghassanpl::hash64_range ( uint64_t &  seed, It  first, It  last, HASHER const &  hasher = {}  )

constexpr

Combines an existing hash value (seed) with the hash of a range of values.

Definition at line 333 of file hashes.h.