Maps with VC++6 - funny looking warnings

This is a discussion on Maps with VC++6 - funny looking warnings within the C++ Programming forums, part of the General Programming Boards category; Hey everyone I'm having some problems with Visual C++ 6.0 when I try to compile my http server that I' ...

  1. #1
    Banned nickname_changed's Avatar
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    Maps with VC++6 - funny looking warnings

    Hey everyone

    I'm having some problems with Visual C++ 6.0 when I try to compile my http server that I' currently writing. Some of my classes use <map>'s, and I suspect thats where the problems are.

    This is part of the code:
    Code:
    #include <map>
    using namespace std;
    
    .....
    
    //----------------------------------------------------------------------------------------------------
    //			Virtual Host class - derived from configuration file
    //----------------------------------------------------------------------------------------------------
    class VIRTUALHOST
    {
      public:
    	string Name;							// Name of this virtual host (ie, RateMyPoo)
    	string HostName;						// Internet Address of host (www.ratemypoo.com)
    	string IndexFiles[10];					// Files that will be used as auto indexes of folders (index.htm)
    	string Root;							// Root folder of files for this VH (ie, c:\RateMyPoo)
    	string Logfile;							// Path/name of log file (C:\RateMyPoo\logfile.log)
    
    	//VIRTUALHOST(string ConfFile);			// Read in virtual hosts from files
    };
    
    //----------------------------------------------------------------------------------------------------
    //			Virtual Host Index (VHI) class. Keeps an index of all the Virtual hosts
    //----------------------------------------------------------------------------------------------------
    class VirtualHostIndex
    {
      public:
    	int NumberOfHosts;
    	map <char *, VIRTUALHOST> Host;			// Map Internet address to appropriate virtual host
    };
    This is a list of some of the 19 warning messages I get:
    Code:
    C:\Documents and Settings\Administrator\My Documents\Projects\SWS01\beta\main.cpp(205) : warning C4786: 'std::pair<std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kf
    n,std::less<char *>,std::allocator<VIRTUALHOST> >::const_iterator,std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocator<VIRTUALHOST> >
    ::const_iterator>' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(182) : warning C4786: 'std::_Tree<char *,std::pair<char * const,char *>,std::map<char *,char *,std::less<char *>,std::allocator<char *> >::_Kfn,std::less<char *>,std::allocator<char *> >::~
    _Tree<char *,std::pair<char * const,char *>,std::map<char *,char *,std::less<char *>,std::allocator<char *> >::_Kfn,std::less<char *>,std::allocator<char *> >' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(182) : warning C4786: 'std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocat
    or<VIRTUALHOST> >::~_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocator<VIRTUALHOST> >' : identifier was truncated to '255' characters in
     the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(162) : warning C4786: 'std::_Tree<char *,std::pair<char * const,char *>,std::map<char *,char *,std::less<char *>,std::allocator<char *> >::_Kfn,std::less<char *>,std::allocator<char *> >::_
    Tree<char *,std::pair<char * const,char *>,std::map<char *,char *,std::less<char *>,std::allocator<char *> >::_Kfn,std::less<char *>,std::allocator<char *> >' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(162) : warning C4786: 'std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocat
    or<VIRTUALHOST> >::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocator<VIRTUALHOST> >' : identifier was truncated to '255' characters in 
    the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(236) : warning C4786: '__ehhandler$?insert@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$allocato
    r@VVIRTUALHOST@@@2@@std@@QAE?AU?$pair@Viterator@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$allocator@VVIRTUALHOST@@@2@@std@@_N@2@ABU?$pair@QADVVIRTUALHOST
    @@@2@@Z' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(236) : warning C4786: '__unwindfunclet$?insert@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$allo
    cator@VVIRTUALHOST@@@2@@std@@QAE?AU?$pair@Viterator@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$allocator@VVIRTUALHOST@@@2@@std@@_N@2@ABU?$pair@QADVVIRTUAL
    HOST@@@2@@Z$0' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\utility(21) : warning C4786: 'std::pair<std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,s
    td::allocator<VIRTUALHOST> >::iterator,bool>::pair<std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocator<VIRTUALHOST> >::iterator,bool
    >' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(512) : warning C4786: '__unwindfunclet$?_Insert@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$all
    ocator@VVIRTUALHOST@@@2@@std@@IAE?AViterator@12@PAU_Node@12@0ABU?$pair@QADVVIRTUALHOST@@@2@@Z$0' : identifier was truncated to '255' characters in the debug information
    I can't even read this stuff, and most of it talks about included files that I've never touched before (and don't intend to).

    I've heard that Visual C++ 6.0 isn't very good with templates, maybe thats what the problem is? If so, what can/should I do to stop these warnings, as I fear they may be changing some of my code (because it still compiles and runs, but doesn't seem to work properly).

    Any help on this matter is most appreciated :)

  2. #2
    Banned nickname_changed's Avatar
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    lol yeah I've searched the boards, but all they say is that VC6 is garbage when it comes to using templates. Doesn't really fix my problem though.... and I can't use Dev because I can't get winsock to work.

    Oh well, the code still compiles so it will have to do.

  3. #3
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    The warning just means that you built a class which is too long for the debug information to hold. You can eliminate the warning (which is pretty harmless) by including:
    #pragma warning(disable:4786)

    That is an implementation error, not anything fundamental to C++ or STL. C++ implementations that use name mangling must be able to deal with very long names. 256 characters can be easily exceeded when templates are involved. STL is not special in that regard.

  4. #4
    Banned nickname_changed's Avatar
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    Thanks very much Wledge! That cut out 8 of the errors. Now I get
    Code:
    c:\program files\microsoft visual studio\vc98\include\xtree(182) : warning C4786: 'std::_Tree<char *,std::pair<char * const,char *>,std::map<char *,char *,std::less<char *>,std::allocator<char *> >::_Kfn,std::less<char *>,std::allocator<char *> >::~
    _Tree<char *,std::pair<char * const,char *>,std::map<char *,char *,std::less<char *>,std::allocator<char *> >::_Kfn,std::less<char *>,std::allocator<char *> >' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(182) : warning C4786: 'std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocat
    or<VIRTUALHOST> >::~_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocator<VIRTUALHOST> >' : identifier was truncated to '255' characters in
     the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(162) : warning C4786: 'std::_Tree<char *,std::pair<char * const,char *>,std::map<char *,char *,std::less<char *>,std::allocator<char *> >::_Kfn,std::less<char *>,std::allocator<char *> >::_
    Tree<char *,std::pair<char * const,char *>,std::map<char *,char *,std::less<char *>,std::allocator<char *> >::_Kfn,std::less<char *>,std::allocator<char *> >' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(162) : warning C4786: 'std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocat
    or<VIRTUALHOST> >::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocator<VIRTUALHOST> >' : identifier was truncated to '255' characters in 
    the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(236) : warning C4786: '__ehhandler$?insert@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$allocato
    r@VVIRTUALHOST@@@2@@std@@QAE?AU?$pair@Viterator@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$allocator@VVIRTUALHOST@@@2@@std@@_N@2@ABU?$pair@QADVVIRTUALHOST
    @@@2@@Z' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(236) : warning C4786: '__unwindfunclet$?insert@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$allo
    cator@VVIRTUALHOST@@@2@@std@@QAE?AU?$pair@Viterator@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$allocator@VVIRTUALHOST@@@2@@std@@_N@2@ABU?$pair@QADVVIRTUAL
    HOST@@@2@@Z$0' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\utility(21) : warning C4786: 'std::pair<std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,s
    td::allocator<VIRTUALHOST> >::iterator,bool>::pair<std::_Tree<char *,std::pair<char * const,VIRTUALHOST>,std::map<char *,VIRTUALHOST,std::less<char *>,std::allocator<VIRTUALHOST> >::_Kfn,std::less<char *>,std::allocator<VIRTUALHOST> >::iterator,bool
    >' : identifier was truncated to '255' characters in the debug information
    c:\program files\microsoft visual studio\vc98\include\xtree(512) : warning C4786: '__unwindfunclet$?_Insert@?$_Tree@PADU?$pair@QADVVIRTUALHOST@@@std@@U_Kfn@?$map@PADVVIRTUALHOST@@U?$less@PAD@std@@V?$allocator@VVIRTUALHOST@@@3@@2@U?$less@PAD@2@V?$all
    ocator@VVIRTUALHOST@@@2@@std@@IAE?AViterator@12@PAU_Node@12@0ABU?$pair@QADVVIRTUALHOST@@@2@@Z$0'
    I guess this might have something to do with the fact that I made a map with a class of my own... although I thought that would be ok. Any idea on what to do with those?

  5. #5
    I lurk
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    You'll need to put that #pragma directive in every single file that would generate such a warning. I used to stick them in the system headers that generated the bugged warnings, then I never had to worry about it if I started a new project.

  6. #6
    Registered User Casey's Avatar
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    I just ignore those warnings. They do nothing except tell me that VC++ has a junky implementation. Why use an implementation-specific #pragma(I don't like pragmas if you can tell ) to remove something that is nothing more than a minor annoyance? You can remove the warnings by turning off all debugging capabilities, but that's just dumb.

  7. #7
    Skunkmeister Stoned_Coder's Avatar
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    MSVC specific......

    look up...

    #pragma warning(disable:4786)

    in your helpfiles.
    Free the weed!! Class B to class C is not good enough!!
    And the FAQ is here :- http://faq.cprogramming.com/cgi-bin/smartfaq.cgi

  8. #8
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    Yeah thanks very much guys, I think I understand how #pragma works and I'll just have to live with the silly warnings. Oh well.

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