Go hashcode 输入一个字符串，得到一个唯一标识码

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