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|
package main
import (
"encoding/xml"
"errors"
"fmt"
)
type Email struct {
Where string `xml:"where,attr"`
Addr string
}
func f(r interface{}) error {
return withPointerAsInterface(&r)
}
func withPointerAsInterface(r interface{}) error {
_ = (r).(*interface{})
rp, ok := (r).(*interface{})
if !ok {
return errors.New("cannot assert to *interface{}")
}
em, ok := (*rp).(*Email)
if !ok {
return errors.New("cannot assert to *Email")
}
em.Where = "work"
em.Addr = "bob@work.com"
return nil
}
func ff(s string, r interface{}) error {
return xml.Unmarshal([]byte(s), r)
}
func fff(s string, r interface{}) error {
return xml.Unmarshal([]byte(s), &r)
}
func main() {
data := `
<Email where='work'>
<Addr>bob@work.com</Addr>
</Email>
`
v := Email{}
err := f(&v)
fmt.Println(err, v)
vv := Email{}
err = ff(data, &vv)
fmt.Println(err, vv)
vvv := Email{}
err = ff(data, &vvv)
fmt.Println(err, vvv)
}
// Output:
// <nil> {work bob@work.com}
// <nil> {work bob@work.com}
// <nil> {work bob@work.com}
|
