Method BoolFunc

bool_func.go:18–20

BoolFunc defines a func flag with specified name, callback function and usage string. The callback function will be called every time "--{name}" (or any form that matches the flag) is parsed on the command line.

(name string, usage string, fn func(string) error)

// The callback function will be called every time "--{name}" (or any form that matches the flag) is parsed
// on the command line.
func (f *FlagSet) BoolFunc(name string, usage string, fn func(string) error) {
	f.BoolFuncP(name, "", usage, fn)
}

// BoolFuncP is like BoolFunc, but accepts a shorthand letter that can be used after a single dash.
func (f *FlagSet) BoolFuncP(name, shorthand string, usage string, fn func(string) error) {