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From: "e.fokken+gnu at posteo dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/71484] Class with implicit public constructor triggers
 `-Wctor-dtor-privacy`
Date: Sat, 27 Mar 2021 21:29:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D71484

Eike <e.fokken+gnu at posteo dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |e.fokken+gnu at posteo dot=
 de

--- Comment #6 from Eike <e.fokken+gnu at posteo dot de> ---
The following code also triggers the warning, although it shouldn't in my
opinion.
Here the private static function is used for initializing a public data mem=
ber.
My g++ --version returns:
g++ (Debian 10.2.1-6) 10.2.1 20210110


  template <typename IntType> struct static_arbitrary_seed {
  private:
    static constexpr IntType fnv(IntType hash, const char *pos) {
      return *pos =3D=3D '\0' ? hash
                          : fnv((hash * IntType(16777619U)) ^ *pos, (pos + =
1));
    }

  public:
    static constexpr IntType value =3D fnv(
        IntType(2166136261U ^ sizeof(IntType)), __DATE__ __TIME__ __FILE__);
  };

The warning is:
../pcg-cpp/include/pcg_extras.hpp:578:38: warning: all member functions in
class =E2=80=98pcg_extras::static_arbitrary_seed<IntType>=E2=80=99 are priv=
ate
[-Wctor-dtor-privacy]

The code is from
https://github.com/imneme/pcg-cpp

in case that is helpful.=