func (l *List) Set(pos uint, val interface{}) bool {
	l.key.Lock()
	defer l.key.Unlock()
	var retval bool
	count := uint(len(l.underlyer))
	if pos > count {
		retval = false
	} else {
		l.underlyer[pos] = val
		retval = true
	}
	return retval
}
func (l *List) Set(pos uint, val interface{}) bool {
	l.key.Lock()
	defer l.key.Unlock()
	var retval bool
	count := uint(len(l.underlyer))
	if pos > count {
		retval = false
	} else {
		l.underlyer[pos] = val
		retval = true
	}
	return retval
}
func ( l * List ) Set ( pos uint , val interface { } ) bool { l . key . Lock ( ) defer l . key . Unlock ( ) var retval bool count := uint ( len ( l . underlyer ) ) if pos > count { retval = false } else { l . underlyer [ pos ] = val retval = true } return retval }
// Set updates the value stored at a given position in the List.
Set updates the value stored at a given position in the List .