HashFunctions.h File Reference

#include "FoundationBase.h"
#include <string_view>
#include <type_traits>

Go to the source code of this file.

Namespaces
namespace	Cogs
	Main Cogs namespace.
namespace	Cogs::Details

Functions
COGSFOUNDATION_API size_t	Cogs::murmur2 (const void *bytes, const size_t length) noexcept
	Implementation of the MurmurHash2 algorithm.
constexpr size_t	Cogs::fnv1a (uint8_t data, size_t hashValue) noexcept
	Hashes a single byte using the fnv1a algorithm.
constexpr size_t	Cogs::fnv1a (const void *bytes, size_t length, size_t hashValue=Details::FNV_offset_basis) noexcept
	Implementation of the FNV-1a algorithm for a block of memory.
constexpr size_t	Cogs::hash () noexcept
	Simple getter function that returns the initial value for fnv1a hashing.
template<typename T , typename std::enable_if< std::is_integral< T >::value||std::is_enum< T >::value||std::is_floating_point< T >::value, int >::type * = nullptr>
constexpr size_t	Cogs::hash (T data, size_t hashValue=hash()) noexcept
	Hash function for integer and floating point types. (And enums.)
constexpr size_t	Cogs::hash (const char *str, size_t hashValue=hash()) noexcept
	Hash function for hashing Null terminated C character strings.
COGSFOUNDATION_API size_t	Cogs::hashLowercase (std::string_view str, size_t hashValue=Cogs::hash()) noexcept
	Get the hash code of the string converted to lowercase.
constexpr size_t	Cogs::hash (const void *mem, size_t size, size_t hashValue=hash()) noexcept
	Hash a non-descript block of memory.
constexpr size_t	Cogs::hash (std::string_view str, size_t hashValue=hash()) noexcept
	Generic hash function specialization for strings (std::string, std::string_view, Cogs::StringView).

Variables
constexpr size_t	Cogs::Details::FNV_offset_basis = (sizeof(size_t) == 8) ? static_cast<size_t>(14695981039346656037ULL) : 2166136261U
constexpr size_t	Cogs::Details::FNV_prime = (sizeof(size_t) == 8) ? static_cast<size_t>(1099511628211ULL) : 16777619U