interfaceexample.go

package main

import (
    "fmt"
    "reflect"
)

func main() {
    a := 0
    b := 1
    ipntrs := []*int{&a, &b}

    vals := []interface{}{ipntrs[0], ipntrs[1], "hello world!"}
    fmt.Println("a is now: ", a)
    fmt.Println("b is now: ", b)
    
    fmt.Println("-----")
    interfaceVarArgs(vals...)
    fmt.Println("-----")
    
    fmt.Println("a is now: ", a)
    fmt.Println("b is now: ", b)
    
    // Output:
    //
    // a is now:  0
    // b is now:  1
    // -----
    // value 0 is: 0
    // value 1 is: 1
    // value 2 is: hello world!
    // -----
    // a is now:  1
    // b is now:  2

}

func interfaceVarArgs(ifaces ...interface{}) {
    for i, iface := range ifaces {
        if reflect.TypeOf(iface).Kind() == reflect.Ptr {
            fmt.Printf("value %d is: %v\n", i, reflect.ValueOf(iface).Elem().Interface())
        } else {
            fmt.Printf("value %d is: %v\n", i, iface)
        }
        if ipntr, ok := iface.(*int); ok {
            *ipntr = i + 1
        }
    }
}