func (g *Glg) WarnFunc(f func() string) error {
	if g.isModeEnable(WARN) {
		return g.out(WARN, "%s", f())
	}
	return nil
}
func (g *Glg) WarnFunc(f func() string) error {
	if g.isModeEnable(WARN) {
		return g.out(WARN, "%s", f())
	}
	return nil
}
func ( g * Glg ) WarnFunc ( f func ( ) string ) error { if g . isModeEnable ( WARN ) { return g . out ( WARN , " " , f ( ) ) } return nil }
// WarnFunc outputs Warn level log returned from the function
WarnFunc outputs Warn level log returned from the function