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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85944] Address of temporary bound to a function parameter
 at global scope not considered constexpr
Date: Wed, 06 Jul 2022 10:44:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D85944

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2021-12-06 00:00:00         |2022-7-6

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This affects the Debug Mode checks in std::array's operator=3D=3D as report=
ed in PR
106212:

namespace std
{
  struct array
  {
    constexpr const void* data() const { return this; }

    constexpr bool operator=3D=3D(const array&) const
    {
      if (data() =3D=3D nullptr)
        throw 1;
      return true;
    }
  };
}

struct P {
  bool operator=3D=3D(P const &) const =3D default;
  std::array e;
};

void f() {
  static_assert(P() =3D=3D P());
}

  static_assert(P() =3D=3D P());



namespace std
{
  struct array
  {
    constexpr const void* data() const { return this; }

    constexpr bool operator=3D=3D(const array&) const
    {
      if (data() =3D=3D nullptr)
        throw 1;
      return true;
    }
  };
}

struct P {
  bool operator=3D=3D(P const &) const =3D default;
  std::array e;
};

void f() {
  static_assert(P() =3D=3D P()); // OK
}

  static_assert(P() =3D=3D P()); // NOT OK=