"More than one operator + matches these operands" error

Question

I'm creating a Money class for a school assignment. I've defined a conversion from Money to double, I have a constructor for Money that takes an int, another constructor takes a double, and I've overloaded the "+" operator to add together two objects of type Money. The error message comes up when I try to do something like `myMoney + 10` where my myMoney is an object of type Money, and 10 is obviously an integer. Here's the rest of the relevant code: ``` class Money { private: int dollars; int cents; public: Money(double r); Money(int d) : dollars(d), cents(0) {} operator double(); } Money operator+(Money a, Money b) { double r = double(a) + double(b); return Money(r); } Money::operator double() { return dollars+double(cents)/100; } Money::Money(double r) { ... } ``` The program actually works if I try `Money(double(myMoney)+10)` and also if I make both constructors explicit, but I'm not sure I understand what's happening with the automatic conversions otherwise. Can anyone explain th…

Accepted Answer

```
MyMoney + 10
```

Since there's no `operator+(Money, int)`, some conversions have to be made here. The compiler could convert the `Money` to a `double`, then convert the 10 to a 'double' and choose the built-in `operator+(double,double)`, or it could convert the `int` to `Money` and choose your `operator+(Money,Money)`.

"More than one operator + matches these operands" error

Solution

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