error: no match for 'operator>>'

Question

I'm reading C++ Primer 5th Edition when i came to this part. It's a code it provided that I have to use but I keep getting

error: no match for 'operator>>' (operand types are std::istream {aka std::basic_istream<char>} and Sales_item)

on line std::cin >> book;

I tried looking it up and rewriting the code but I can't get it to work so I need help to fix this problem.

#include <iostream>
#include "Sales_item.h"


int main()
{
    Sales_item book;
    // read ISBN, number of copes sold, and sales price
    std::cin >> book;
     // write ISBN, number of copies sold, total revenue, and average price
    std::cout << book << std::endl;
    return 0;
}

Have you implemented `operator>>(std::istream &in, Sales_item &book)` for `Sales_item` class? — 101010, Jul 09 '14 at 19:06
Is there an `operator>>` defined for `Sales_item`? It won't work without custom code. — crashmstr, Jul 09 '14 at 19:06

score 2 · Answer 1 · edited May 23 '17 at 12:20

2

The reason the operator is undefined is because operators work for specific types. Your type that you created, Sales_item, does not have that operator - unless you overloaded it to work for your specific type. See this question on Operator Overloading for more info.

edited May 23 '17 at 12:20

Community

1
1

answered Jul 09 '14 at 19:06

Ricky Mutschlechner

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This would be a good answer if you added code on how to do it, like here: http://www.learncpp.com/cpp-tutorial/93-overloading-the-io-operators/ – Engineer2021 Jul 09 '14 at 19:11
@staticx I'll get on that. – Ricky Mutschlechner Jul 09 '14 at 19:13
@RickyMutschlechner that would be appreciated – MrSkrifle Jul 09 '14 at 19:22
@user3821846 Could you post your Sales_item class? I'd be happy to tailor the code sample for your specific need rather than wasting time making some example. – Ricky Mutschlechner Jul 09 '14 at 19:24
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@RickyMutschlechner thanks anyway but I managed to fix the problem – MrSkrifle Jul 09 '14 at 19:32
@user3821846 Great, hopefully my answer helped! – Ricky Mutschlechner Jul 09 '14 at 19:33
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@user3821846: If you have solved your problem, it would help to create your own answer or delete this question. – Engineer2021 Jul 09 '14 at 19:55

error: no match for 'operator>>'

1 Answers1