maps in Visual Studio 6.0

This is a discussion on maps in Visual Studio 6.0 within the C++ Programming forums, part of the General Programming Boards category; Hello, I want to use maps in Visual Studio 6.0. However, declaring Code: map<char *, int> asdf; Gives many warnings: ...

  1. #1
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    maps in Visual Studio 6.0

    Hello,

    I want to use maps in Visual Studio 6.0. However, declaring
    Code:
    	map<char *, int> asdf;
    Gives many warnings:
    Code:
    c:\program files\microsoft visual studio\vc98\include\xtree(200) : warning C4786: '?rbegin@?$_Tree@PADU?$pair@QADH@std@@U_Kfn@?$map@PADHU?$less@PAD@std@@V?$allocator@H@2@@2@U?$less@PAD@2@V?$allocator@H@2@@std@@QAE?AV?$reverse_bidirectional_iterator@
    Viterator@?$_Tree@PADU?$pair@QADH@std@@U_Kfn@?$map@PADHU?$less@PAD@std@@V?$allocator@H@2@@2@U?$less@PAD@2@V?$allocator@H@2@@std@@U?$pair@QADH@3@AAU43@PAU43@H@2@XZ' : identifier was truncated to '255' characters in the browser information
            c:\program files\microsoft visual studio\vc98\include\map(46) : see reference to class template instantiation 'std::_Tree<char *,struct std::pair<char * const,int>,struct std::map<char *,int,struct std::less<char *>,class std::allocator<int>
     >::_Kfn,struct std::less<char *>,class std::allocator<int> >' being compiled
    
    c:\mydir\myprog.cpp(187) : warning C4786: 'std::reverse_bidirectional_iterator<std::_Tree<char *,std::pair<char * const,int>,std::map<char *,int,std::less<char *>,std::allocator<int> >::_Kfn,std::less<char *>,std::allocator<int> >:
    :const_iterator,std::pair<char * const,int>,std::pair<char * const,int> const &,std::pair<char * const,int> const *,int>' : identifier was truncated to '255' characters in the debug information
    How can I avoid these warnings? Or is this a compiler limitation? They get in the way of other warnings/errors I have.

    Thanks.

  2. #2
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    Those warnings are common in VC++ 6.0. You can ignore them. To stop them from being shown, you can use #pragma warning(disable: 4786) at the top of your file, or at the top of the VC++ include file itself. If you search for C4786 you'll find a lot of information on it.

    BTW, you should be careful of using char* in a map. The C++ string class might be a better choice depending on what you are trying to do.

  3. #3
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    Thanks for the fast response.
    That doesn't seem to work. I still get the C4786 warnings. Is there something else I need to have?

  4. #4
    Registered User hk_mp5kpdw's Avatar
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    The beginning of your program should look something like this:
    Code:
    #pragma warning(disable:4786)
    
    #include <map>
    
    ... rest of your code goes here as normal ...
    If you've done that then you shouldn't be seeing those warnings when compiling. If you put the #pragma after the #include <map> line you would still get the warnings. The #pragma must come before the #include <map> line (I think that's how it goes).

    ...or, just compile in release mode instead of debug mode and those warnings will go away on their own.
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

  5. #5
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    Thanks, that worked.
    However, when I try to add elements to a map, I get the following warnings:
    Code:
    c:\program files\microsoft visual studio\vc98\include\utility(23) : warning C4786: '??0?$pair@Viterator@?$_Tree@VCString@@U?$pair@$$CBVCString@@I@std@@U_Kfn@?$map@VCString@@IU?$less@VCString@@@std@@V?$allocator@I@3@@3@U?$less@VCString@@@3@V?$allocat
    or@I@3@@std@@_N@std@@QAE@ABViterator@?$_Tree@VCString@@U?$pair@$$CBVCString@@I@std@@U_Kfn@?$map@VCString@@IU?$less@VCString@@@std@@V?$allocator@I@3@@3@U?$less@VCString@@@3@V?$allocator@I@3@@1@AB_N@Z' : identifier was truncated to '255' characters in
     the browser information
            c:\program files\microsoft visual studio\vc98\include\map(93) : see reference to class template instantiation 'std::pair<class std::_Tree<class CString,struct std::pair<class CString const ,unsigned int>,struct std::map<class CString,unsigne
    d int,struct std::less<class CString>,class std::allocator<unsigned int> >::_Kfn,struct std::less<class CString>,class std::allocator<unsigned int> >::iterator,bool>' being compiled
            c:\program files\microsoft visual studio\vc98\include\map(93) : while compiling class-template member function 'unsigned int &__thiscall std::map<class CString,unsigned int,struct std::less<class CString>,class std::allocator<unsigned int> >
    ::operator [](const class CString &)'
    c:\program files\microsoft visual studio\vc98\include\utility(21) : warning C4786: 'std::pair<std::_Tree<CString,std::pair<CString const ,unsigned int>,std::map<CString,unsigned int,std::less<CString>,std::allocator<unsigned int> >::_Kfn,std::less<C
    String>,std::allocator<unsigned int> >::iterator,bool>::pair<std::_Tree<CString,std::pair<CString const ,unsigned int>,std::map<CString,unsigned int,std::less<CString>,std::allocator<unsigned int> >::_Kfn,std::less<CString>,std::allocator<unsigned i
    nt> >::iterator,bool>' : identifier was truncated to '255' characters in the debug information
    Linking...
    Last edited by Yasir_Malik; 09-25-2006 at 12:56 PM.

  6. #6
    Code Goddess Prelude's Avatar
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    >Is there something else I need to have?
    A better compiler.
    My best code is written with the delete key.

  7. #7
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    I want to add that I only get those warnings, where as before, I was getting a sargasso of repeated warnings.

  8. #8
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    I just edited the files that actually gave the warnings and add the pragma to the pragmas at the top of the files. I think you might have to save the file, then close down MSDev before re-compiling, but I'm not sure. The fact that there are fewer warnings means you are getting closer at least.

  9. #9
    Its hard... But im here swgh's Avatar
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    As predlude said, MSVC++6.0 is quite dated now. If you got your hands on a more up to date compiler you may rid yourself of the warnings. Try DevC++4.992 or code::blocks IDE

    If you want to stick with Mictorsoft, they are handing out MSVC++2005 express edition for free download from their site, it may be a big advantage to you later on to have a more standard compilant compiler - if not, you will run into more errors as you go along

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