IV68542: ORDER OF AUTO_PTR COPY CONSTRUCTOR AFFECTING CONSTRUCTOR RESOLUTION

XL C/C++ for AIX Fix Pack 11 (February 2015 PTF) for 12.1
XL C/C++ for AIX Fix Pack 12 (May 2015 PTF) for 12.1
XL C/C++ for AIX Fix Pack 13 (August 2015 Update) for 12.1
XL C/C++ for AIX Fix Pack 14 (December 2015 Update) for 12.1
XL C/C++ for AIX Fix Pack 15 (April 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 16 (July 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 17 (November 2016 Update) for 12.1
XL C/C++ for AIX Fix Pack 18 (February 2017 Update) for 12.1
XL C/C++ for AIX Fix Pack 19 (August 2017 Update) for 12.1
XL C/C++ for AIX Fix Pack 20 (March 2018 Update) for 12.1
XL C/C++ for AIX Fix Pack 21 (January 2019 Update) for 12.1

APAR status

• Closed as program error.

Error description

• The order that constructors are declared in a class is affecting
  constructor resolution for a constructor that accepts auto_ptr
  as a parameter.  If the two constructor declarations in the
  following test case are swapped, the issues does not occur:
  
  
     === TEST CASE ===
  
  #include <memory>
  
  class Test
  {
    public:
      Test(const Test&);
      Test(std::auto_ptr<int> func);
  };
  
  std::auto_ptr<int> f();
  
  void func()
  {
    Test test( f() );
  }
  
  "test.cpp", line 14.8: 1540-1260 (S) An object of type
  "Test" cannot be constructed from an rvalue of type
  "std::auto_ptr<int>".
  

Local fix

• Swap constructor order positioning.
  

Problem summary

• PROBLEM DESCRIPTION:
  An internal cache in the compiler stores a set of conversions
  without user-defined conversions in the first pass.  This
  limits the conversion sequences chosen in the second pass.
  
  USERS AFFECTED:
  Users with user-defined conversion sequence with an explicit
  copy constructor defined inside of the class.
  

Problem conclusion

• The compiler now stores user-defined conversions in the
  internal cache.  The issue is now resolved.
  

Temporary fix

Comments

APAR Information

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

  IV63647

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

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels