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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96716] GCC reports "object is private" when it's accessed
 through proper accessor
Date: Thu, 20 Aug 2020 08:06:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96716

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-08-20
     Ever confirmed|0                           |1
           Keywords|                            |rejects-valid

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:

struct string_view
{
  constexpr string_view(const char* p) : p(p) { }
  const char* p;
};

class Foo {
 public:
  constexpr string_view getfoo() const {
    return {&foo};
  }
 private:
  const char foo =3D 'c';
};

inline constexpr Foo foo;

template <typename>
class Bar {
 public:
  static constexpr auto bar =3D foo.getfoo();
};

auto& baz =3D Bar<int>::bar;


pr96716.C: In instantiation of 'constexpr const string_view Bar<int>::bar':
pr96716.C:24:23:   required from here
pr96716.C:21:25: error: 'const char Foo::foo' is private within this context
   21 |   static constexpr auto bar =3D foo.getfoo();
      |                         ^~~
pr96716.C:13:14: note: declared private here
   13 |   const char foo =3D 'c';
      |              ^~~=