PI81632: CLASS INCORRECTLY IDENTIFIED AS ABSTRACT CLASS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Code containing an abstract class with pure virtual functions
  has a child class implementing all virtual functions, however
  XLC erroneously identifies the child class and it's implemented
  functions as abstract.
  
  
  
     === TEST CASE ===
  struct  Base{
    virtual void* a(long s, char* e) = 0;
    virtual void* b(long s) = 0;
    virtual void  c(void* ptr) = 0;
    virtual char* d() const = 0;
    virtual ~Base(){ }
  };
  
  template <const char * ID>
  struct Child : public Base
  {
    void * a(long s, char * e) { return 0; }
    void * b(long s) { return 0; }
    void   c(void * ptr) {}
    char * d() const { return (char *) ID; }
  
    static Child<ID>& get()
    {
      static Child<ID> instance;
      return instance;
    }
  };
  
  extern const char ex[7];
  template class Child<ex>;
  
  
  
  $ xlC -c -qlanglvl=extended0x apar.cpp
  "./apar.cpp", line 19.22: CCN6117 (S) "instance" cannot use the
  abstract class "Child" as the type of an object, parameter type,
  or return type.
  "./apar.cpp", line 2.17: CCN6112 (I) "Base::a(long, char *)" is
  a pure virtual function.
  "./apar.cpp", line 3.17: CCN6112 (I) "Base::b(long)" is a pure
  virtual function.
  "./apar.cpp", line 4.17: CCN6112 (I) "Base::c(void *)" is a pure
  virtual function.
  "./apar.cpp", line 5.17: CCN6112 (I) "Base::d() const" is a pure
  virtual function.
  CCN0793(I) Compilation failed for file ./apar.cpp.  Object file
  not created.
  FSUM8226 make: Error code 12
  $
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: XLC Users of -qtmplparse=error or            *
  *                 -qlanglvl=extended0x who have a              *
  *                 template class derived from an abstract      *
  *                 base class may see errors indicating that    *
  *                 virtual functions were not overridden.       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Additional diagnostic checking in       *
  *                      template definitions with certain       *
  *                      options exposed an invalid diagnostic   *
  *                      check in a template definition where    *
  *                      virtual function overrides did not      *
  *                      have the optional virtual keyword       *
  *                      specified.                              *
  ****************************************************************
  .
  

Problem conclusion

• Apply service provided.
  

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:

  PI84090 IV99661 PI95836

Modules/Macros

• CCNECICS CCNECWI  CCNED220 CCNEDSCT CCNEDWRT CCNEFILT CCNEHIFC
  CCNEMDEP CCNEOPTP CCNEP    CCNEPP   CCNETBY  CCNMSGE  CCNMSGT
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R7A0 PSY UI46641

     UP17/06/08 P F706

Fix is available

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