LI70894: Compile error given for valid templates code

Latest updates for XL C/C++ Advanced Edition V7 for Linux

APAR status

• Closed as program error.

Error description

• $ cat t.cpp
  #include <iostream>
  template <class T>
  struct Confuse {
     typedef T ScalarType;
  };
  template <class T>
  struct Forward {
     typedef typename Confuse<T>::ScalarType ScalarType;
  };
  template <class T>
  class Vector{
  };
  template <class T>
  class Array{
     typedef typename Confuse<T>::ScalarType ScalarType;
     public:
     void mf(const Vector<ScalarType> &);
  };
  template <class T>
  void Array<T>::mf(const Vector<ScalarType> &){ std::cout <<
  "Hello" <<
  std::endl;}
  template class Array<char>;
  template void Array<int>::mf(const Vector<
  Confuse<int>::ScalarType >
  &);
  .
  $ xlC -c t.cpp
  "t.cpp", line 27.15: 1540-0092 (S) An explicit instantiation
  must instantiate a
  template function definition.
  

Local fix

Problem summary

• same as submitter's text
  

Problem conclusion

• USERS AFFECTED:  Users of class templates with member
   functions defined out-of-line, specifically where a typedef
   member of the template class is referenced in a template
   argument in the return type or argument list of the out-of-line
   definition.
  PROBLEM DESCRIPTION: The compiler was incorrectly unwinding
   the typedef in the template argument which caused the
   out-of-line definition to fail to match the declaraction
   inside its containing class.
  WORKAROUND:   To work around the problem, move the definition of
   the member function inside the class.
  EXPECTED ERRORS:  With the -qtmplparse=error option, users will
   see a message that the member being defined out-of-line was
   not declared as a member of its containing class.
  

Temporary fix

Comments

APAR Information

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

  IY70330

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

Fix information

• Fixed component name

  XL C/C++ SLES9

• Fixed component ID

  5724K7700

Applicable component levels

• R700 PSY

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