Q255528: BUG: Violation in Constructor w/ Variable Number of Arguments

Article: Q255528
Product(s): Microsoft C Compiler
Version(s): winnt:
Operating System(s): 
Keyword(s): kbCPPonly kbSTL kbVS600bug
Last Modified: 03-MAY-2001

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The information in this article applies to:

- The C/C++ Compiler (CL.EXE) 
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SYMPTOMS
========

An access violation may occur if you have a class derived from ostringstream and
if this class has a constructor with variable number of arguments.

CAUSE
=====

Incorrect code is generated when the first argument in the variable argument
list is a zero.

RESOLUTION
==========

To workaround the problem, use any one of the following three resolutions:

1. Do not use variable number of arguments for the class constructor.

2. Let the first argument in the constructor's variable argument list be a
  non-zero value.

3. Use a default class constructor with no arguments and then call another
  member function with a variable argument list.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

  Compile Options : cl /GX test.cpp

  //Test.cpp

  #include <iostream>
  #include <sstream>
  using namespace std;

  class Test : public ostringstream
  {
  public:
      Test(bool n,  ...)
  	{
  	}
  };

  void main()
  {
          cout << "Calling Test " << endl;
          Test my_test1(true, 1); //OK.

          cout << "Calling Test again " << endl;
          Test my_test2(true, 0); //Causes Access Violation  

  }

Additional query words:

======================================================================
Keywords          : kbCPPonly kbSTL kbVS600bug 
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : winnt:
Issue type        : kbbug

=============================================================================

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