hash causes panic

[dann-romm]

i was looking for hash function implementation using maphash and found your repo

there is a hash method of Map in file maps/hash/hash.go
if you use integer type as comparable K key, you get a panic
panic: interface conversion: interface {} is int, not []uint8

it is also panics if key is any Number type, like float64 or uint16

i believe, error in the byte conversion:
bytes := any(key).([]byte)

[bdreece]

I would not recommend using this repository for anything in production at this point, many of the collections are unimplemented or untested. Regardless, I will work on fixing this particular issue in case you end up using it, and I am thinking the right approach will look something like this:

func (m *Map) hash(key K) int {
    keyString := fmt.Sprint(key)
    m.Hash.WriteString(keyString)
    return int(m.Hash.Sum64() % len(*m.Vector))
}

[dann-romm]

thanks for reply and sorry for misunderstanding, i don't use this in production, i was looking specifically for a way to take a hash function from any type (i mean, comparable type)

fortunately i found solution working for me, in this case we can use gob encoder to get byte slice something like this:

func newHashFunc[K comparable]() func(K) uint64 {
	var h maphash.Hash
	h.SetSeed(maphash.MakeSeed())
	var buf bytes.Buffer
	encoder := gob.NewEncoder(&buf)

	return func(key K) uint64 {
		h.Reset()
		buf.Reset()
		_ = encoder.Encode(key)
		_, _ = h.Write(buf.Bytes())
		value := h.Sum64()
		return value
	}
}

or in your implementation:

func (m *Map) hash(key K) int {
	var buf bytes.Buffer
	encoder := gob.NewEncoder(&buf)
	encoder.Encode(key)
	
	h.Reset()
	m.Hash.Write(buf.Bytes())
	return int(m.Hash.Sum64() % len(*m.Vector))
}