.cpp

namespace std
{

    // Needed to use ESM::FormId as a key in std::unordered_map
    template <>
    struct hash<ESM::FormId>
    {
        size_t operator()(const ESM::FormId& formId) const
        {
            // Hash each member and combine them
            size_t h1 = std::hash<uint32_t>()(formId.mIndex);
            size_t h2 = std::hash<int32_t>()(formId.mContentFile);
            
            // Combine the hashes of mIndex and mContentFile
            return h1 ^ (h2 << 1); // XOR with shift to create a combined hash
        }
    };

}