Re: [go-nuts] Efficient to copy Hash?

[Christian LeMoussel]

I optimize like this 

// Copy returns a copy of hash.Hash
func (d *digest) Copy() hash.Hash {
    dCopy := *d
    return &dCopy
}

But I got error d1.Copy undefined (type hash.Hash has no field or method 
Copy)  with this code

    d1 := sha256.New()
    d2 := sha256.New()
    d1.Write([]byte("a"))
    fmt.Println(d1.Size())
    d2 = d1.Copy()




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