紧急：接口转换：接口{}是** string，不是string

Question

How to convert double pointer string to string?

In this example we can directly pass string argument. But I have double pointer string to string requirement in my app.

package main

import (
    "fmt"
)

func main() {
    s := "ss"
    a := &s
    Modify(&a)
}

func Modify(s interface{}) {
    fmt.Println(s)

}

Playground: https://play.golang.org/p/d4hrG9LzLNO

Answer 1

You require to assert **string to get underlying value wrapped around interface{}. And then dereference the value of string using double pointer.

package main

import (
    "fmt"
)

func main() {
    s := "ss"
    a := &s
    Modify(&a)
}

func Modify(s interface{}) {
     fmt.Println(**s.(**string))
}

Playground