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[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 18_support / comparisons / categories / zero_neg.cc

// Copyright (C) 2020-2021 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-options "-std=gnu++2a" }
// { dg-do compile { target c++2a } }

#include <compare>

// C++20 [cmp.categories.pre]
// "an argument other than a literal 0 is undefined"

void
test01()
{
  std::partial_ordering::equivalent == 0; // OK
  std::weak_ordering::equivalent == 0;    // OK
  std::strong_ordering::equivalent == 0;  // OK

  std::partial_ordering::equivalent == 1; // { dg-error "invalid conversion" }
  std::weak_ordering::equivalent == 1;    // { dg-error "invalid conversion" }
  std::strong_ordering::equivalent == 1;  // { dg-error "invalid conversion" }

  constexpr void* p = nullptr;
  std::partial_ordering::equivalent == p; // { dg-error "invalid conversion" }
  std::weak_ordering::equivalent == p;    // { dg-error "invalid conversion" }
  std::strong_ordering::equivalent == p;  // { dg-error "invalid conversion" }

  // Ideally these would be ill-formed, but the current code accepts it.
  std::partial_ordering::equivalent == nullptr;
  std::weak_ordering::equivalent == nullptr;
  std::strong_ordering::equivalent == nullptr;
}