LI77632: ERROR MESSAGE FOR EXPLICIT COPY CONSTRUCTOR

XL C/C++ for Linux Fix Pack 8 (October 2015 Update) for 12.1
XL C/C++ for Linux Fix Pack 4 (October 2013 Update) for 12.1
XL C/C++ for Linux Fix Pack 5 (December 2013 Update) for 12.1
XL C/C++ for Linux Fix Pack 6 (February 2014 Update) for 12.1
XL C/C++ for Linux Fix Pack 7 (May 2014 Update) for 12.1

APAR status

• Closed as program error.

Error description

• The following test case shows that for an unused copy
  constructor, making it explicit or private explicit fails the
  compilation with errors complaining the member is not a member
  of the class.
  
  $ xlC d31594910-test1-t.cpp  -o a1.t
  "d31594910-test1-t.cpp", line 12.26: 1540-0217 (S) "a" is not a
  member of "struct B".
  "d31594910-test1-t.cpp", line 12.5: 1540-0700 (I) The previous
  message was produced while processing "B::B(const B &)".
  "d31594910-test1-t.cpp", line 23.9: 1540-0700 (I) The previous
  message was produced while processing "main()".
  
  
  $cat d31594910-test1-t.cpp
  #include <iostream>
  
  struct A {
      int a;
      A(int v) : a(v) {}
  };
  
  struct B {
      const int b_;
  
      template <typename T>
      B(const T & t) : b_(t.a) {}
  
      explicit
      B(const B &b) : b_(b.b_) { std::cout << "from B(const B
  &b): " << b.b_ << std::endl; }
  };
  
  void foo( const B & b ) { std::cout << "from foo: " << b.b_ <<
  std::endl; }
  
  int main()
  {
      A a(5);
      foo(a);
  }
  

Local fix

• Remove explicit keyword
  

Problem summary

• PROBLEM DESCRIPTION: Explicit constructor candidate issue for
  initialization of second temporary from result of a
  user-defined conversion
  
  Explicit constructors are not considered candidates by the XL
  C/C++ compiler when performing the second standard conversion
  of a user-defined conversion. Since the initialization
  associated with the second standard conversion is a direct
  initialization, explicit constructors should be included in the
  set of candidates.
  
  USERS AFFECTED: Users of user defined conversions with a target
  type having explicit constructors callable with one argument.
  

Problem conclusion

• Explicit constructors are now considered as candidates in the
  affected context.
  

Temporary fix

Comments

APAR Information

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

  IV46067

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

Fix information

• Fixed component name

  XL C/C++ FOR LI

• Fixed component ID

  5725C7300

Applicable component levels

• RC10 PSN IV46067

     UP06/09/13