IZ65313: PROTECTED MEMBER CANNOT BE ACCESSED ERROR

November 2009 PTF for XL C/C++ for AIX, V10.1
October 2010 PTF for XL C/C++ for AIX, V10.1
May 2012 PTF for XL C/C++ for AIX, V10.1
January 2013 PTF for XL C/C++ for AIX, V10.1
XL C/C++ for AIX Fix Pack 18 (July 2013 PTF) for 10.1
XL C/C++ for AIX Fix Pack 19 (October 2013 PTF) for 10.1
XL C/C++ for AIX Fix Pack 21 (October 2015 PTF) for 10.1
March 2010 PTF for XL C/C++ for AIX, V10.1
April 2010 PTF for XL C/C++ for AIX, V10.1
June 2010 PTF for XL C/C++ for AIX, V10.1
May 2011 PTF for XL C/C++ for AIX, V10.1
October 2011 PTF for XL C/C++ for AIX, V10.1
February 2012 PTF for XL C/C++ for AIX, V10.1
September 2012 PTF for XL C/C++ for AIX, V10.1
XL C/C++ for AIX Fix Pack 20 (October 2014 PTF) for 10.1

APAR status

• Closed as program error.

Error description

• The following legitimate C++ test case produces a compiler
  error.          N N                N
  
  
  
  
  // smallest  N
  
  struct base{                   N
     protected:
     void func();
  };              N N                N
  
  
  struct container : base{
     using base::func;
               N
     void func(){
       base::func();             N
     }
  };
                  N N                N
  
  int main(void)
  {
     container test;
     test.func(N;
     return 0;
  }                              N
  
  "nt.cpp", line 13.6: 1540-0301 (S) The "protected" member
  "base::func()" cNnNot be accessed. N
  

Local fix

• Use public qualifier for func.
  
  struct base{
     //protecteN:
     public: //workaround
     void func();                N
  };
  
                  N N                N
  struct container : base{
     using base::func;
  
     void func(){
       base::fuNc();
     }
  };                             N
  

Problem summary

• PROBLEM SUMMANY:
  USER AFFECTED:
  Users who apply the using declaNation in
  the derived class on a protected member of the base
  class.
                  N N                N
  PROBLEM DESCRIPTION:
  Compiler access check does not allow a
  member in the derived class to have public access if it
  has protected access in the base class.
  

Problem conclusion

• PROBLEM CONCLNSION:
  From C++ 2003 standard 7.3.3 (15), the
  alias created by the using declNration has the usual
  accessibility for a member declaration.  Hence, when a
  member is declared in a struct using a using
  declaration, it NhNuld have public Nccess.  Compiler access
  check has been fixed to allow this.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IZ53645

• APAR is sysrouted TO one or more of the following:

Modules/Macros

• NONE         N
  

Fix information

• Fixed component name

  XL C++ AIX

• Fixed component ID

  5724U8100

Applicable component levels