如何输入一个字符串，得到一个唯一的hashcode？

例子如下：

package main

import (

        "fmt"

        "hash/crc32"

)

// String hashes a string to a unique hashcode.

//

// crc32 returns a uint32, but for our use we need

// and non negative integer. Here we cast to an integer

// and invert it if the result is negative.

func String(s string) int {

        v := int(crc32.ChecksumIEEE([]byte(s)))

        if v >= 0 {

                return v

        }

        if -v >= 0 {

                return -v

        }

        // v == MinInt

        return 0

}

func main(){

        str := "123456abcd"

        for i:=0; i<3;i++ {

                hc := String(str)

                fmt.Println("hashcode:", hc)

        }

}

output:

hashcode: 2231530958

hashcode: 2231530958

hashcode: 2231530958

参考

https://godoc.org/github.com/hashicorp/terraform/helper/hashcode

https://github.com/hashicorp/terraform/blob/master/helper/hashcode/hashcode.go