IV87850: DEFAULT TEMPLATE PARAMETER NOT RECOGNIZED

XL C/C++ for AIX Fix Pack 8 (August 2016 PTF) for 13.1
XL C/C++ for AIX Fix Pack 9 (June 2017 PTF) for 13.1
XL C/C++ for AIX Fix Pack 10 (February 2018 PTF) for 13.1
XL C/C++ for AIX Fix Pack 11 (November 2018 PTF) for 13.1

APAR status

• Closed as program error.

Error description

• The compiler is emitting an invalid error message stating that
  the wrong number of arguments are provided for a function call
  that uses a default parameter.
  
  
  
     === TEST CASE ===
  
  class ClassA
  {
   public:
    static bool func1( const int& a);
  
    template< typename T >
    static bool func2(const int& a);
  };
  
  template< typename T >
  bool ClassA::func2(const int& a)
  {
    return T::inst().load( false );  // ONE PARAM GIVEN
  }
  
  template< class T >
  class ClassB
  {
   public:
    static T& inst() { return *(new T); }
  };
  
  class ClassC
  {
   public:
    bool load( const bool& val1,
               const bool& val2 = false );  // DEFAULT PARAM
  };
  
  bool ClassA::func1( const int& a )
  {
      return func2< ClassB< ClassC > >( a );
  }
  
  
  $ xlC -c apar.cpp
  "test.cpp", line 13.24: 1540-0215 (S) The wrong number of
  arguments has been specified for "ClassC::load(const bool &,
  const bool &)".
  "test.cpp", line 11.6: 1540-0700 (I) The previous message was
  produced while processing "ClassA::func2<ClassB<ClassC> >(const
  int &)".
  "test.cpp", line 32.12: 1540-0700 (I) The previous message was
  produced while processing "ClassA::func1(const int &)".
  $
  

Local fix

Problem summary

• USERS AFFECTED:
  Users of template functions may be affected by this issue
  
  PROBLEM DESCRIPTION:
  Name lookup was incorrectly resolving names at the wrong
  location for a
  template-dependent call causing error messages.
  

Problem conclusion

• The problem has been resolved in the compiler.
  

Temporary fix

Comments

APAR Information

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

  IV84510

• 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