Help needed with "error C2784"

Help needed with "error C2784"

• belangereric

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• Srimurugan G

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• AndersW

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• Spidermans_DarkSide - VSIP

  I am not sure if that is a bug. I just took a brief look at the standard (section 21) and it mentiones that string is the one containning the operators. I am not sure where in the standard does it say that iostream should import all string operators.
  
  I might be missing something so it would be great if you can provide me with more details.
  
  Thanks,
    Ayman Shoukry
    VC++ Team
  
  

• EyalMSDN

  Could you please report the bug you mentioned to the product feedback at http://lab.msdn.microsoft.com/productfeedback/
  
  I will look into the C2784 error that you are seeing
  
  Thanks,
    Ayman Shoukry
    VC++ Team
  
  

• HeatherA

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• Prerak Shah

  I am going to address your core question:
  
  There is already a lot of discussion in the C++ community that #include <iostream> already pulls in way too many other headers - and believe me it was not designed this way. Why should <iostream> pull in <string> The two are not related and there is really no reason why one should depend on the other.
  
  We do provide every STL function and algorithm but our library, which is, BTW, provided by Dinkumware, was designed to minimize dependencies between the different components of STL.
  
  If I am using string manipulation functions I expect to add #include <string> to my code, if I am using some algorithms I expect to have to add #include <algorithm>, if I want to use a vector I add #include <vector>.
  
  Your code uses some functionality that is associated with string ... so I don't see why you have an issue with adding #include <string> to your code.
  
  Would you expect the following to work
  
  #include <iostream>
  
  int main()
  {
     std::vector<std::string> strings;
  }
  
  I know that I, and many other people in C++ community, would not expect this to compile.
  
  

• Brian Seekford

  /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_VC80_UPGRADE=0x0710" /D "_MBCS" /FD /EHsc /RTC1 /MDd /GS- /Yu"stdafx.h" /Fp".\Debug/TestConsoleApp.pch" /Fo".\Debug/" /Fd".\Debug/" /W3 /c /ZI /TP .\TestConsoleApp.cpp
  
  I usually test the code first in VS.NET 2003 than I convert the project into VS.NET 2005.
  
  It was a normal Wizard Win32 Console application.
  
  

• Capt. Mick

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• edutrom

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• John Fran

  At the top, add:

  #include <iostream>
  #include <string>
  using namespace std;
  
  I got the same error, and it works for me after adding the #include.  I am not sure why the rest of the code compiles without #include<stream>.
  
  Brian
  

  
  

• zogman

  Sorry, I can't repro this! I just created a console application for VS 2005 placed your code into it and it compiles without problem.
  
  

• Kevin P

  If you use string then you should include <string>.  That's your job, not the job of the library implementor.
  
  The fact that some other compiler uses <string> in their implementation of <iostream> doesn't mean every compiler should.
  
  
  

• AndreaMasi

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• Help needed with "error C2784"