grahamsutton / moneyman

     *

     * @throws \MoneyMan\Exception\CannotAddDifferentCurrenciesException

     */

    public function add(Money $money)

    {

        // Validate they are of the same currency.

        if (!$this->hasSameCurrencyAs($money)) {

            throw new CannotAddDifferentCurrenciesException(

                'To directly add two money objects together, they must be of the same currency.' .

                'Use \MoneyMan\Exchange::add(\MoneyMan\Money, \MoneyMan\Money) to add \MoneyMan\Money ' .

                'objects of different currencies.'

            );

        }

        $total_amount = $this->getAmount() + $money->getAmount();

        return new self(

            $total_amount,

            $this->getCurrency()

        );

    }

    /**

     * Subtracts the incoming \MoneyMan\Money object's amount from this object.

     *

     * @throws \MoneyMan\Exception\CannotSubtractDifferentCurrenciesException

     */

    public function subtract(Money $money)

    {

        // Validate they are of the same currency.

        if (!$this->hasSameCurrencyAs($money)) {

            throw new CannotSubtractDifferentCurrenciesException(

                'To directly subtract one money object from another, they must be of the same currency.' .

                'Use \MoneyMan\Exchange::subtract(\MoneyMan\Money, \MoneyMan\Money) to subtract \MoneyMan\Money ' .

                'objects of different currencies.'

            );

        }

        $total_amount = $this->getAmount() - $money->getAmount();

        return new self(

            $total_amount,

            $this->getCurrency()

        );

    }

    /**

     * Determine if this \MoneyMan\Money object has the same currency as another