散列任意对象的正确方法

Question

I am writing a data structure that needs to hash an arbitrary object. The following function seems to fail if I give an int is the parameter.

func Hash( obj interface{} ) []byte {
    digest := md5.New()
    if err := binary.Write(digest, binary.LittleEndian, obj); err != nil {
        panic(err)
    }
    return digest.Sum()
}

Calling this on an int results in:

panic: binary.Write: invalid type int

What is the right way to do this?

Answer 1

binary.Write writes "a fixed-size value or a pointer to a fixed-size value." Type int is not a fixed size value; int is "either 32 or 64 bits." Use a fixed-size value like int32.