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From: Alex Blekhman on 17 Jun 2007 06:45
aarthi28(a)gmail.com wrote:
> I have written this code, and at the end, I am trying to write a
> vector of strings into a text file. However, my program is nor
> compiling, and it gives me the following error when I try to write to
> the file:
>
> error C2679: binary '<<' : no operator found which takes a right-hand
> operand of type 'std::string' (or there is no acceptable conversion)
>
> I don't know what I am doing wrong. I have posted my entire program
> here.
> Thank you
>
> #include <iostream>
> #include <fstream>
> #include <iterator>
> #include <algorithm>
> #include <vector>
> #include <math.h>
> #include "string.h"

You forgot #include <string>.

Alex
From: Alex Blekhman on 19 Jun 2007 05:05
Tim Roberts wrote:
>> You forgot #include <string>.
>
> OK, I admit I am confused. I cut and pasted his code to my local PC, and
> in fact you are correct: #include <string> fixes it.
>
> However, long before he tries to write the string to cout, we see this:
>
> string achar, nchar;
> int main(int argc, char* argv[])
> vector<string> n_word_list;
> vector<string> a_word_list;
>
> all of which compiles successfully. Further, the error message (shown
> above) clearly shows that the compiler knows that "string" means
> "std::string".
>
> So, the compiler has PART of std::string, but not all?

Yes, other standard headers can include <string> or forward
declare `std::string' for internal purposes. However, you
should not rely on it. In your specific case, `operator <<'
that writes `std::string' into a stream is declared inside
<string>.

Alex
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