libstdc++-v3/testsuite/18_support/comparisons/object/93479.cc

// Copyright (C) 2020-2026 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// { dg-do compile { target c++20 } }

#include <compare>

void
test01()
{
  // PR libstdc++/93479
  int i[1];
  int j[1];
  std::compare_three_way{}(i, j); // { dg-error "no match" }
}

void
test02()
{
  struct X
  {
    operator const char*() const noexcept { return "!"; }
    void operator<=>(X) const = delete;
    void operator<=>(const void*) const = delete;
  } x;
  std::compare_three_way{}(x, x); // { dg-error "no match" }
  std::compare_three_way{}(x, ""); // { dg-error "no match" }
  std::compare_three_way{}("", x); // { dg-error "no match" }
}

// { dg-prune-output "in requirements with" }