Hashing.h File Reference

#include "wpi/ErrorHandling.h"
#include "wpi/SwapByteOrder.h"
#include "wpi/type_traits.h"
#include <algorithm>
#include <bit>
#include <cassert>
#include <cstring>
#include <optional>
#include <string>
#include <tuple>
#include <utility>

Go to the source code of this file.

Classes
class	wpi::hash_code
	An opaque object representing a hash code. More...
struct	wpi::hashing::detail::hash_state
	The intermediate state used during hashing. More...
struct	wpi::hashing::detail::is_hashable_data< T >
	Trait to indicate whether a type's bits can be hashed directly. More...
struct	wpi::hashing::detail::is_hashable_data< std::pair< T, U > >
struct	wpi::hashing::detail::hash_combine_recursive_helper
	Helper class to manage the recursive combining of hash_combine arguments. More...
struct	wpi::DenseMapInfo< hash_code, void >

Namespaces
namespace	wpi
namespace	wpi::hashing
namespace	wpi::hashing::detail

Functions
template<typename T >
std::enable_if_t< is_integral_or_enum< T >::value, hash_code >	wpi::hash_value (T value)
	Compute a hash_code for any integer value. More...
template<typename T >
hash_code	wpi::hash_value (const T *ptr)
	Compute a hash_code for a pointer's address. More...
template<typename T , typename U >
hash_code	wpi::hash_value (const std::pair< T, U > &arg)
	Compute a hash_code for a pair of objects. More...
template<typename... Ts>
hash_code	wpi::hash_value (const std::tuple< Ts... > &arg)
	Compute a hash_code for a tuple. More...
template<typename T >
hash_code	wpi::hash_value (const std::basic_string< T > &arg)
	Compute a hash_code for a standard string. More...
template<typename T >
hash_code	wpi::hash_value (const std::optional< T > &arg)
	Compute a hash_code for a standard string. More...
void	wpi::set_fixed_execution_hash_seed (uint64_t fixed_value)
	Override the execution seed with a fixed value. More...
uint64_t	wpi::hashing::detail::fetch64 (const char *p)
uint32_t	wpi::hashing::detail::fetch32 (const char *p)
uint64_t	wpi::hashing::detail::rotate (uint64_t val, size_t shift)
	Bitwise right rotate. More...
uint64_t	wpi::hashing::detail::shift_mix (uint64_t val)
uint64_t	wpi::hashing::detail::hash_16_bytes (uint64_t low, uint64_t high)
uint64_t	wpi::hashing::detail::hash_1to3_bytes (const char *s, size_t len, uint64_t seed)
uint64_t	wpi::hashing::detail::hash_4to8_bytes (const char *s, size_t len, uint64_t seed)
uint64_t	wpi::hashing::detail::hash_9to16_bytes (const char *s, size_t len, uint64_t seed)
uint64_t	wpi::hashing::detail::hash_17to32_bytes (const char *s, size_t len, uint64_t seed)
uint64_t	wpi::hashing::detail::hash_33to64_bytes (const char *s, size_t len, uint64_t seed)
uint64_t	wpi::hashing::detail::hash_short (const char *s, size_t length, uint64_t seed)
uint64_t	wpi::hashing::detail::get_execution_seed ()
template<typename T >
std::enable_if_t< is_hashable_data< T >::value, T >	wpi::hashing::detail::get_hashable_data (const T &value)
	Helper to get the hashable data representation for a type. More...
template<typename T >
std::enable_if_t<!is_hashable_data< T >::value, size_t >	wpi::hashing::detail::get_hashable_data (const T &value)
	Helper to get the hashable data representation for a type. More...
template<typename T >
bool	wpi::hashing::detail::store_and_advance (char *&buffer_ptr, char *buffer_end, const T &value, size_t offset=0)
	Helper to store data from a value into a buffer and advance the pointer into that buffer. More...
template<typename InputIteratorT >
hash_code	wpi::hashing::detail::hash_combine_range_impl (InputIteratorT first, InputIteratorT last)
	Implement the combining of integral values into a hash_code. More...
template<typename ValueT >
std::enable_if_t< is_hashable_data< ValueT >::value, hash_code >	wpi::hashing::detail::hash_combine_range_impl (ValueT *first, ValueT *last)
	Implement the combining of integral values into a hash_code. More...
template<typename InputIteratorT >
hash_code	wpi::hash_combine_range (InputIteratorT first, InputIteratorT last)
	Compute a hash_code for a sequence of values. More...
template<typename ... Ts>
hash_code	wpi::hash_combine (const Ts &...args)
	Combine values into a single hash_code. More...
hash_code	wpi::hashing::detail::hash_integer_value (uint64_t value)
	Helper to hash the value of a single integer. More...

Variables
static constexpr uint64_t	wpi::hashing::detail::k0 = 0xc3a5c85c97cb3127ULL
	Some primes between 2^63 and 2^64 for various uses. More...
static constexpr uint64_t	wpi::hashing::detail::k1 = 0xb492b66fbe98f273ULL
static constexpr uint64_t	wpi::hashing::detail::k2 = 0x9ae16a3b2f90404fULL
static constexpr uint64_t	wpi::hashing::detail::k3 = 0xc949d7c7509e6557ULL
uint64_t	wpi::hashing::detail::fixed_seed_override
	A global, fixed seed-override variable. More...