IV35718: INCORRECT DEFAULT TEMPLATE TYPE ARGUMENT INIT

March 2013 PTF for XL C/C++ for AIX, V12.1

APAR status

• Closed as program error.

Error description

• A template instantiation error is seen for a template class's
  inline template function, that does not use a defined default
  type from the template class's instantiation type.  For example,
  an inline constructor:
  
  
   template < typename T, typename MYTYPE = default_type<T> >
   class A
   {
     template < typename MYTYPETYPE>
     A( MYTYPETYPE value );
   };
  
   template < typename T, typename MYTYPE >
   template < typename MYTYPETYPE >
   inline
   A< MYTYPE >::A( MYTYPETYPE value) { }
  
   ...
  
   A< char, not_default_type<char> >;
  
  
  The output error:
  
  1540-0295 (S) A parameter of type "not_default_type<char> &"
  cannot be initialized with an rvalue of type
  "default_type<char>".
  

Local fix

• N/A
  

Problem summary

• PROBLEM DESCRIPTION:
  An unused default template argument was being used in an
  instantiation causing a compiler error.
  
  USERS AFFECTED:
  The problem is very specific:  a template class with a default
  template argument has a member template function with a default
  function argument, the default function argument references the
  template parameter with the default argument from the enclosing
  class, that member template function is defined out-of-line AND
  the template parameter has the same name as the class
  definition.
  

Problem conclusion

• The problem has been resolved.
  

Temporary fix

Comments

APAR Information

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

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

  LI77324

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels

• RC10 PSY U858524

     UP C