如何从uuid中获得2个长数字？

Question

I'm using this library to generate a v4 uuid:

https://github.com/satori/go.uuid

What is the most efficient way to get 2 long ints from the generated uuid?

Answer 1

You can use the Bytes() function to get the bytes and then convert to a long with encoding/binary. As @icza mentioned, you can also slice the UUID object directly, so you don't even need to call Bytes().

package main

import "fmt"
import "encoding/binary"
import "github.com/satori/go.uuid"

func main() {
    u1 := uuid.NewV4()
    fmt.Printf("UUIDv4: %s
", u1)

    l1 := binary.BigEndian.Uint64(u1[:8])
    l2 := binary.BigEndian.Uint64(u1[8:])

    fmt.Printf("%x %x
", l1, l2)
    fmt.Printf("%v %v
", l1, l2)
}