Flag package iterator helpers

// This program demonstrates how to iterate over all command‑line flags
// using the current Go 1.27.1 flag package. The proposed All() iterator
// and Flag.IsSet field are not yet available, so we use VisitAll instead.
package main

import (
	"flag"
	"fmt"
)

func main() {
	// Define a couple of flags for demonstration.
	var name string
	var age int
	flag.StringVar(&name, "name", "world", "your name")
	flag.IntVar(&age, "age", 0, "your age")

	// Parse the command line arguments.
	flag.Parse()

	// VisitAll walks over all defined flags, regardless of whether they
	// were set on the command line. The callback receives a *flag.Flag.
	flag.VisitAll(func(f *flag.Flag) {
		fmt.Printf("flag: --%s, value: %s, default: %s\n",
			f.Name, f.Value.String(), f.DefValue)
	})
}