libstdc++-v3/testsuite/20_util/is_swappable_with/value.cc

// { dg-do compile { target c++17 } }

// Copyright (C) 2016-2021 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/>.

#include <type_traits>
#include <testsuite_tr1.h>

#ifndef __cpp_lib_is_swappable
# error "Feature-test macro for is_swappable_with missing"
#elif __cpp_lib_is_swappable != 201603
# error "Feature-test macro for is_swappable_with has wrong value"
#endif

namespace funny {
  struct T0 {};

  void swap(T0, T0);

  struct T1 {};
  struct T2 {};

  void swap(T1, T2);
  void swap(T2, T1);

  struct BoolLike {};

  void swap(BoolLike, bool&);
  void swap(bool&, BoolLike);

  struct F0 {};

  void swap(F0, F0) = delete;

  struct F1 {};

  void swap(F0, F1) = delete;
  void swap(F1, F0) = delete;

  struct F2 {};
  struct F3 {};

  void swap(F2, F3);
  void swap(F3, F2) = delete;

  struct F4
  {
    friend void swap(F4, F4) = delete;
  };
}

void test01()
{
  using std::is_swappable_with;
  using namespace __gnu_test;
  // Positive tests.
  static_assert(test_property<is_swappable_with, int&, int&>(true), "");
  static_assert(test_property<is_swappable_with, funny::T0,
    funny::T0>(true), "");
  static_assert(test_property<is_swappable_with, funny::T0,
    const funny::T0>(true), "");
  static_assert(test_property<is_swappable_with, funny::T1,
    funny::T2>(true), "");
  static_assert(test_property<is_swappable_with, funny::T2,
    funny::T1>(true), "");
  static_assert(test_property<is_swappable_with, funny::BoolLike,
    bool&>(true), "");
  static_assert(test_property<is_swappable_with, const funny::BoolLike,
    bool&>(true), "");

  // Negative tests.
  static_assert(test_property<is_swappable_with, int, int>(false), "");
  static_assert(test_property<is_swappable_with, int&, unsigned&>(false), "");
  static_assert(test_property<is_swappable_with, const int&,
    const int&>(false), "");
  static_assert(test_property<is_swappable_with, funny::F0,
    funny::F0>(false), "");
  static_assert(test_property<is_swappable_with, funny::F0,
    const funny::F0>(false), "");
  static_assert(test_property<is_swappable_with, funny::T0,
    funny::T1>(false), "");
  static_assert(test_property<is_swappable_with, funny::F0,
    funny::F1>(false), "");
  static_assert(test_property<is_swappable_with, funny::F0,
    const funny::F1>(false), "");
  static_assert(test_property<is_swappable_with, const funny::F0,
    funny::F1>(false), "");
  static_assert(test_property<is_swappable_with, funny::F2,
    funny::F3>(false), "");
  static_assert(test_property<is_swappable_with, funny::F2,
    const funny::F3>(false), "");
  static_assert(test_property<is_swappable_with, const funny::F2,
    funny::F3>(false), "");
  static_assert(test_property<is_swappable_with, funny::F4,
    funny::F4>(false), "");
  static_assert(test_property<is_swappable_with, funny::BoolLike,
    funny::BoolLike>(false), "");
}