C++ error C2593: 'operator <<' is ambiguous

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Hi Friends.,

The below block of statements causing error(error C2593: 'operator <<' is ambiguous) while build application:

C++

ostream& operator <<( ostream &os, const Options& O )
{
   for(Options::const_iterator mIt = O.mPlanOptions.begin(); mIt != O.mPlanOptions.end(); mIt++)
		os << mIt->first << " " << mIt->second << endl;
	return os;
}

No error if I remove "mIt->second" from "os << mIt->first << " " << mIt->second << endl;"

As I am new to c++, can anyone explain about the error.

Thanks.

Posted 8-Sep-15 1:35am

willington.d

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CPallini 8-Sep-15 7:45am

It all depends on the type of mIt->first (or mIt->second). Unfortunately you didn't make us know about.

willington.d 8-Sep-15 7:52am

It showing that, the type is Class Options. The "typedef DATA::const_iterator const_iterator;" is declared inside this class.

CPallini 8-Sep-15 8:03am

I need to know the types of mIt->first and mIt->second in order to understand better.

willington.d 8-Sep-15 8:20am

I do not know. Tell me where to find?
Class Options
{
public: typedef DATA::const_iterator const_iterator;
}

I couldn't find any reference or anything in that.

willington.d 8-Sep-15 8:35am

And the DATA is declared as "typedef map<string, optionvector=""> DATA;"

CPallini 8-Sep-15 8:45am

OK, the problem is 'optionvector'. What is it?

willington.d 9-Sep-15 3:11am

optionvector is a Class

CPallini 9-Sep-15 5:26am

Yes, I guessed that (it was an instance of a class) and proposed my solution below. However, without actually seeing the class definition we can only procede with guesswork.

willington.d 9-Sep-15 7:36am

No. Still I am getting the same error. I did a sample program using online c++ (http://rextester.com/IKEMN27665). The sample program is working without any issues in online.
But error(error C2593: 'operator <<' is ambiguous) in my vs c++ 6.0

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CPallini · Answer 1 · 2015-09-08T03:01:00

Solution 1

Assuming the optionvector class provides a string cast operator, you might write

os << mIt->first << " " << static_cast<string>(mIt->second) << endl;

or (if your compiler doesn't like the static_cast keyword)

os << mIt->first << " " << (string) mIt->second << endl;

Posted 8-Sep-15 3:01am

CPallini

Comments

willington.d 10-Sep-15 9:28am

Not working. Tried both but the same error is being displayed. Any other solutions???

CPallini 11-Sep-15 5:17am

Yes, get rid of VS C++ 6.0.