BUG: "System.NullReferenceException" exception while using the vector<bool> class (837698)

RESOLUTION

1. Start Microsoft Visual Studio .NET 2003.
2. On the File menu, point to New, and then click Project.
3. Under Project Types, click Visual C++ Projects, and then click Console Application (.NET) under Templates.
4. In the Name box, type Vector, and then click OK.
5. In Solution Explorer, expand all the folders, and then in the Source Files folder, double-click Vector.cpp.
6. Add the following code to the code window after the #using statement:

   #include <vector>

7. Replace the code in the _tmain function with the following code:

   std::vector< bool > v;
   
   for( int i = 0; i < 32; ++i )
   v.push_back( true );
   
   for( int j = 0; j < 32; ++j )
   v.pop_back(); // crashes here
   return 0;

8. In the code window, right-click the #include <vector> statement, and then click Open Document <vector>.
   
   This opens the vector include file in the code window.
9. In the vector file, find, and then comment the following code:

   const_iterator& operator+=(difference_type _Off)
   	{	// increment by integer
   	this->_Myoff += _Off;
   	this->_Myptr += this->_Myoff / _VBITS;
   	this->_Myoff %= _VBITS;
   	return (*this);
   	}

10. Add the following code after the code that you commented in step 10:

    const_iterator& operator+=(difference_type _Off)
    	{ // increment by integer
    	if (_Off < 0 && this->_Myoff < 0 - (size_type)_Off)
    	{ /* add negative increment */
    	this->_Myoff += _Off;
    	this->_Myptr -= 1 + ((size_type)(-1) - this->_Myoff) / _VBITS;
    	this->_Myoff %= _VBITS;
    	}
    	else
    	{ /* add non-negative increment */
    	this->_Myoff += _Off;
    	this->_Myptr += _Myoff / _VBITS;
    	this->_Myoff %= _VBITS;
    	}
    	return (*this);
    	}

11. On the File menu, click Save All to save all the files.
12. On the Build menu, click Rebuild Solution.
13. On the Debug menu, click Start to run the program in Debug mode.
    
    The program runs without any errors.