package main
import (
"fmt"
"reflect"
)
type S struct {
N int
}
func setIntPtr() {
var n int = 2
reflect.ValueOf(&n).Elem().SetInt(4)
fmt.Printf("setIntPtr: n=%d\n", n)
}
func setStructFieldDirect() {
var s S
reflect.ValueOf(&s.N).Elem().SetInt(5)
fmt.Printf("setStructFieldDirect: n=%d\n", s.N)
}
func setStructPtrField() {
var s S
reflect.ValueOf(&s).Elem().Field(0).SetInt(6)
fmt.Printf("setStructPtrField: s.N: %d\n", s.N)
}
func handlePanic(funcName string) {
if msg := recover(); msg != nil {
fmt.Printf("%s panicked with '%s'\n", funcName, msg)
}
}
func setStructField() {
defer handlePanic("setStructField")
var s S
reflect.ValueOf(s).Elem().Field(0).SetInt(4)
fmt.Printf("s.N: %d\n", s.N)
}
func setInt() {
defer handlePanic("setInt")
var n int = 2
rv := reflect.ValueOf(n)
rv.Elem().SetInt(4)
}
func setIntPtrWithString() {
defer handlePanic("setIntPtrWithString")
var n int = 2
reflect.ValueOf(&n).Elem().SetString("8")
}
func main() {
setIntPtr()
setStructFieldDirect()
setStructPtrField()
setInt()
setStructField()
setIntPtrWithString()
}
