Hi everybody,
Here is the classical world wide used ELF:

size_t Hash(const String& key)
{
    UInt32 hash = 0;
    for (size_t i = 0; i < key.GetLength(); ++i)
    {
        hash = (hash << 4) + key[i];
        const UInt32 g = hash & 0xF0000000;
        if (g != 0)
            hash ^= g >> 24;
        hash &= ~g;
    }
    return hash;
}

The problem is it's a 32bits algorithm which doesn't fit size_t for 64bits.
I tried to search information for a proper 64bits ELF hashing but could not find information.
Any help to understand how to have a proper 64bits ELF hashing would be very helpful.
Thanks a lot!

What is your usecase for a 64bit hashing algorithm and why does it matter if it doesn't fill an entire size_t?

It's mostly for learning purpose about what would be the best default approach.
But your comment makes also sense, ELF 32 bits will not block any working usage for a full range.
Maybe then the conclusion is ELF 32 bits is the best default hash for string for 32 bits and 64 bits.