参数列表
- fn func(*Flag) 函数
返回值
功能说明
- 按照字典顺序遍历所有已设置的flag参数,对每个参数调用fn方法
代码示例
package main
import (
"flag"
"fmt"
)
const (
defaultUsage = "help message"
)
var (
myFlagSet = flag.NewFlagSet("newflagset", flag.ExitOnError)
uintFlag = myFlagSet.Uint("uintFlag", 1000, defaultUsage)
testFlag = myFlagSet.String("testFlag", "default value", defaultUsage)
float64Flag = myFlagSet.Float64("float64Flag", 0.9917, defaultUsage)
uintVar uint
)
func print(f *flag.Flag) {
fmt.Println(" ", f.Name, f.Value)
}
func main() {
args := []string{
"-uintFlag", "24",
"-float64Flag", "2718e28",
"arg1",
}
myFlagSet.Parse(args)
fmt.Println("Visit:")
myFlagSet.Visit(print)
fmt.Println("VisitAll:")
myFlagSet.VisitAll(print)
}
运行结果
// ./testflagsetvisit
Visit:
float64Flag 2.718e+31
uintFlag 24
VisitAll:
float64Flag 2.718e+31
testFlag default value
uintFlag 24