解析前更改布尔标志的值
Change value of boolean flag before parsing
sandbox/tmp/main.go
package main
import (
"flag"
"sandbox/tmp/pac"
)
func main() {
flag.Set("str_flag", "new_val")
// flag.Set("bool_flag", true) // How to set this?
flag.Parse()
pac.PrintFlags()
}
sandbox/tmp/pac/pac.go
package pac
import "flag"
var (
boolFlag = flag.Bool("bool_flag", false, "")
strFlag = flag.String("str_flag", "def_val", "")
)
func PrintFlags() {
println(*boolFlag)
println(*strFlag)
}
布尔标志的 flag.Set()
的补码是什么?
只需使用您在命令行中提供的字符串表示形式,例如 "true"
:
flag.Set("bool_flag", "true")
引用自Package doc: Command line flag syntax:
Boolean flags may be:
1, 0, t, f, T, F, true, false, TRUE, FALSE, True, False
因此以下也有效:
flag.Set("bool_flag", "1")
flag.Set("bool_flag", "t")
flag.Set("bool_flag", "T")
flag.Set("bool_flag", "TRUE")
flag.Set("bool_flag", "True")
sandbox/tmp/main.go
package main
import (
"flag"
"sandbox/tmp/pac"
)
func main() {
flag.Set("str_flag", "new_val")
// flag.Set("bool_flag", true) // How to set this?
flag.Parse()
pac.PrintFlags()
}
sandbox/tmp/pac/pac.go
package pac
import "flag"
var (
boolFlag = flag.Bool("bool_flag", false, "")
strFlag = flag.String("str_flag", "def_val", "")
)
func PrintFlags() {
println(*boolFlag)
println(*strFlag)
}
布尔标志的 flag.Set()
的补码是什么?
只需使用您在命令行中提供的字符串表示形式,例如 "true"
:
flag.Set("bool_flag", "true")
引用自Package doc: Command line flag syntax:
Boolean flags may be:
1, 0, t, f, T, F, true, false, TRUE, FALSE, True, False
因此以下也有效:
flag.Set("bool_flag", "1")
flag.Set("bool_flag", "t")
flag.Set("bool_flag", "T")
flag.Set("bool_flag", "TRUE")
flag.Set("bool_flag", "True")