FIX: Using CString::operator+= May Cause an Access Violation

MORE INFORMATION

Sample Code

/* Compile options needed: default
*/ 

{
  CString str1, str2;

  str1  = _T("allocspace");  // length of RHS > 0, allocate memory
                         // str1 += str2 will otherwise do a fast copy
                         // if both CStrings are uninitialized

  str1  = _T("");        // make str1 NULL
                         // operator= will put '\0' at m_pchData[0]

  str2  = str1;          // str1 and str2 share the same m_pchData.
                         // m_pchData now has ref count of 2

  str1 += _T("");        // m_pchData has ref count of 1 but both str1
                         // and str2 use this data.
}