Exemplo n.º 1
0
// WithdrawPct subtracts a percentage of the balance. It returns the
// quantity that has been deducted and an error or nil if the percentage
// is not in the range 0..100.
func (h *Resource) WithdrawPct(percentage float64) (us.Quantity, error) {
	if percentage < 0 || percentage > 100 {
		msg := fmt.Sprintf("percentage not in range 0..1")
		return us.Quantity{}, errors.New(msg)
	}
	taken := us.MultFac(h.balance, percentage/100.0)
	h.balance = us.Subtract(h.balance, taken)
	return h.Convert(taken), nil
}
Exemplo n.º 2
0
// Withdraw subtracts the given amount from the Resource.
// Return true for success, false for incompatible unit or out of bounds
func (h *Resource) Withdraw(q us.Quantity) bool {
	if !us.AreCompatible(h.balance, q) {
		return false
	}
	n := us.Subtract(h.balance, q)
	if h.outOfBounds(n) {
		return false
	}
	h.balance = n
	return true
}