IV69603: DECLTYPE ERROR WITH OVERLOADED OPERATOR

XL C/C++ for AIX Fix Pack 3 (April 2015 PTF) for 13.1
XL C/C++ for AIX Fix Pack 4 (July 2015 PTF) for 13.1
XL C/C++ for AIX Fix Pack 5 (November 2015 PTF) for 13.1
XL C/C++ for AIX Fix Pack 6 (February 2016 PTF) for 13.1
XL C/C++ for AIX Fix Pack 7 (May 2016 PTF) for 13.1
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 outputting an invalid error when using C++11
  decltype with an overloaded operator.
  
  
     === TEST CASE ===
  
  template <typename T>
  T&& myDeclVal();
  
  template <typename F>
  struct MyTDeclType
  {
   typedef decltype(myDeclVal<F>()()) type;
  };
  
  class FuncObj
  {
   public:
    int operator()();
  };
  
  int main()
  {
   // WORKS
   typedef decltype(myDeclVal<FuncObj>() ()) t1;
  
   // DOES NOT WORK
   typedef MyTDeclType<FuncObj ()>::type t2;
  }
  
  
  $ xlC -c -qlanglvl=extended0x apar.cpp
  "test.cpp", line 7.40: 1540-2442 (S) This expression cannot be
  used as a decltype expression.
  "test.cpp", line 22.17: 1540-0700 (I) The previous message was
  produced while processing "struct MyTDeclType<FuncObj ()>".
  "test.cpp", line 16.5: 1540-0700 (I) The previous message was
  produced while processing "main()".
  $
  

Local fix

• NA
  

Problem summary

• PROBLEM DESCRIPTION:
  Invalid error with C++11 decltype.
  
  USERS AFFECTED:
  Users with decltype in a struct.
  

Problem conclusion

• Fix was implemented.
  

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:

Fix information

• Fixed component name

  XL C/C++ FOR AI

• Fixed component ID

  5725C7200

Applicable component levels

• RD10 PSY

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