StringHash.hpp

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#pragma once
#include <entt/entt.hpp>
 
namespace Cori {
    namespace Utility {
        constexpr std::uint64_t fnv1a64(const char *str, const std::size_t len) {
            std::uint64_t hash = 0xcbf29ce484222325ULL; // offset basis
            for (std::size_t i = 0; i < len; ++i) {
                hash ^= static_cast<unsigned char>(str[i]);
                hash *= 0x100000001b3ULL; // fnv prime
            }
            return hash;
        }
 
        using StringHash64 = uint64_t;
        using StringHash32 = entt::hashed_string::hash_type;
 
        //constexpr StringHash32 HashString(const char* str) {
        //  return entt::hashed_string(str).value();
        //}
//
        //constexpr StringHash32 HashString(const std::string& str) {
        //  return entt::hashed_string(str.c_str()).value();
        //}
    }
}

[[nodiscard]] consteval Cori::Utility::StringHash32 operator""_hs32(const char* str, [[maybe_unused]] size_t len) {
    return entt::hashed_string(str).value();
}

[[nodiscard]] consteval Cori::Utility::StringHash64 operator""_hs64(const char* str, const size_t len) {
    return Cori::Utility::fnv1a64(str, len);
}