BUG: You still receive a "warning C4768" message even if you use the warning pragma to disable the warning in Visual C++

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Article ID: 167355 - View products that this article applies to.
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Warnings similar to the following are generated even if you use the warning pragma to disable the warning:
warning C4786:
'std::rb_tree<CAiSpanningTree<State,std::less<State>>::TransClosureNode, CAiSpanningTree<State,std::less<State>>::TransClosureNode,std::ident<Cai SpanningTree<State,std::less<State>>::TransClosureNode,CAiSpanningTree<S tate,std::less<State>>::TransClosureNode>,std::less<CAiSpanningTree<Stat e,std::less<State>>::TransClosureNode>>' : identifier was truncated to '255' characters in the debug information
The code:
   #pragma warning(disable:4786)
disables warnings that list the file and line number. For example:
   C:\test\Text.cpp(25) : warning C4786:


Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.

This problem was corrected in Microsoft Visual C++ .NET.


This warning can be ignored. However, the identifier may not be accessible or viewable in the debugger.

Sample code

   Compiler Options: /Zi

   #include <stddef.h>
   #include <new.h>
   #pragma warning(disable:4786)

   namespace std {

      template <class T, class U>  struct ident {};
      template <class T1, class T2> struct pair {};
      template <class Arg1, class Arg2, class Result>
         struct binary_function {};
      template <class T>struct less : binary_function<T, T, bool> {};
      template <class T, class Distance> struct bidirectional_iterator {};
      template <class Key, class Value, class KeyOfValue, class Compare>
        class rb_tree {
             typedef int size_type;
             typedef int difference_type;
             typedef void* link_type;
             struct rb_tree_node {};
             typedef Key key_type;
             class iterator : public bidirectional_iterator<Value,
                difference_type> {};
             class const_iterator   : public
                bidirectional_iterator<Value,difference_type> {
                    link_type node;
                    const_iterator(link_type x) : node(x) {}
                size_type count(const key_type& x) const;
        template <class Key, class Value, class KeyOfValue,
                 class Compare>
                 rb_tree<Key, Value, KeyOfValue, Compare>::size_type
                 rb_tree<Key, Value, KeyOfValue, Compare>::
                 count(const Key& k) const {
                    size_type n = 0;
                    return n;
             template <class Key, class Compare>   class set {
               typedef ::std::rb_tree<Key, Key,ident<Key, Key>, Compare>
          rep_type t;


   template <class Node, class Compare>class CAiTransitiveClosure{

      typedef std::set<Node, Compare > NodeSet; NodeSet m_todo;


   template <class Node, class Compare> class CAiSpanningTree {

      typedef std::set<Node, Compare > NodeSet;


      typedef Node CAiSpanningTreeNode;
      typedef NodeSet CAiSpanningTreeNodeSet;


      struct TransClosureNode {};
      struct TransClosureGraph
        : public CAiTransitiveClosure<TransClosureNode,

   std::less<TransClosureNode> > 



      CAiSpanningTree(const Node& initialNode);
      CAiSpanningTree(const NodeSet& initialNodes);


   struct State { };
   class CformSpanningTree:public CAiSpanningTree<State,std::less<State>>

       CFormSpanningTree( NodeSet initial)
      : CAiSpanningTree<State, std::less<State> >(initial)



Article ID: 167355 - Last Review: February 24, 2014 - Revision: 3.0
  • Microsoft Visual C++ 5.0 Enterprise Edition
  • Microsoft Visual C++ 6.0 Enterprise Edition
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  • Microsoft Visual C++ 6.0 Professional Edition
  • Microsoft Visual C++, 32-bit Learning Edition 6.0
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