hash.h

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#pragma once
 
#include <cstdint>
#include <string>
#include <string_view>
 
namespace bs {
    constexpr std::uint64_t FNV_OFFSET_BASIS = 2166136261;
    constexpr std::uint64_t FNVPrime = 16777619;
 
    constexpr std::uint64_t hash(const char *const pString, const std::size_t nLength) {
        std::uint64_t nHash = FNV_OFFSET_BASIS;
 
        for (std::size_t i = 0; i < nLength; i++) {
            nHash ^= pString[i]; // XOR byte into the hash
            nHash *= FNVPrime; // Multiply by FNV prime
        }
 
        return nHash;
    }
 
    constexpr std::uint64_t hash(const std::string_view sString) {
        return hash(sString.data(), sString.length());
    }
 
    inline std::uint64_t hash(const std::string &sString) {
        return hash(sString.data(), sString.length());
    }
 
    constexpr std::uint64_t hash(const char *const pString) {
        return hash(std::string_view(pString));
    }
}