package flag
Visit visits the command-line flags in lexicographical order(also known as dictionary order or alphabetical order), calling fn (1st parameter) for each. It visits only those flags that have been set.
Golang flag.Visit() function usage example
package main
import (
"flag"
"fmt"
)
func main() {
f := flag.NewFlagSet("flag", flag.ExitOnError)
f.Int("int", 0, "int flag with value")
visitor := func(a *flag.Flag) {
fmt.Println(">", a.Name, "value=", a.Value)
}
fmt.Println("First visit")
f.Visit(visitor) // no value assigned
f.Parse([]string{"-int", "108"}) // visit flag set earlier and assign value
fmt.Println("Second visit")
f.Visit(visitor)
}
Output :
First visit
Second visit
> int value= 108
Reference :
http://golang.org/pkg/flag/#Visit
