//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// <list>

// template <class T, class Alloc>
//   void swap(list<T,Alloc>& x, list<T,Alloc>& y); // constexpr since C++26

#include <list>
#include <cassert>
#include "test_macros.h"
#include "test_allocator.h"
#include "min_allocator.h"

TEST_CONSTEXPR_CXX26 bool test() {
  {
    int a1[] = {1, 3, 7, 9, 10};
    int a2[] = {0, 2, 4, 5, 6, 8, 11};
    std::list<int> c1(a1, a1 + 5);
    std::list<int> c2(a2, a2 + 7);
    std::list<int>::iterator it1       = c1.begin();
    std::list<int>::const_iterator it2 = c2.begin();
    swap(c1, c2);
    assert(c1 == std::list<int>(a2, a2 + 7));
    assert(c2 == std::list<int>(a1, a1 + 5));
    assert(it1 == c2.begin()); // Iterators remain valid
    assert(it2 == c1.begin()); // Iterators remain valid
  }
  {
    int a2[] = {0, 2, 4, 5, 6, 8, 11};
    std::list<int> c1;
    std::list<int> c2(a2, a2 + 7);
    swap(c1, c2);
    assert(c1 == std::list<int>(a2, a2 + 7));
    assert(c2.empty());
    assert(std::distance(c2.begin(), c2.end()) == 0);
  }
  {
    int a1[] = {1, 3, 7, 9, 10};
    std::list<int> c1(a1, a1 + 5);
    std::list<int> c2;
    swap(c1, c2);
    assert(c1.empty());
    assert(std::distance(c1.begin(), c1.end()) == 0);
    assert(c2 == std::list<int>(a1, a1 + 5));
  }
  {
    std::list<int> c1;
    std::list<int> c2;
    swap(c1, c2);
    assert(c1.empty());
    assert(std::distance(c1.begin(), c1.end()) == 0);
    assert(c2.empty());
    assert(std::distance(c2.begin(), c2.end()) == 0);
  }
  {
    int a1[] = {1, 3, 7, 9, 10};
    int a2[] = {0, 2, 4, 5, 6, 8, 11};
    typedef test_allocator<int> A;
    std::list<int, A> c1(a1, a1 + 5, A(1));
    std::list<int, A> c2(a2, a2 + 7, A(1));
    swap(c1, c2);
    assert((c1 == std::list<int, A>(a2, a2 + 7)));
    assert(c1.get_allocator() == A(1));
    assert((c2 == std::list<int, A>(a1, a1 + 5)));
    assert(c2.get_allocator() == A(1));
  }
  {
    int a1[] = {1, 3, 7, 9, 10};
    int a2[] = {0, 2, 4, 5, 6, 8, 11};
    typedef other_allocator<int> A;
    std::list<int, A> c1(a1, a1 + 5, A(1));
    std::list<int, A> c2(a2, a2 + 7, A(2));
    swap(c1, c2);
    assert((c1 == std::list<int, A>(a2, a2 + 7)));
    assert(c1.get_allocator() == A(2));
    assert((c2 == std::list<int, A>(a1, a1 + 5)));
    assert(c2.get_allocator() == A(1));
  }
#if TEST_STD_VER >= 11
  {
    int a1[] = {1, 3, 7, 9, 10};
    int a2[] = {0, 2, 4, 5, 6, 8, 11};
    std::list<int, min_allocator<int>> c1(a1, a1 + 5);
    std::list<int, min_allocator<int>> c2(a2, a2 + 7);
    swap(c1, c2);
    assert((c1 == std::list<int, min_allocator<int>>(a2, a2 + 7)));
    assert((c2 == std::list<int, min_allocator<int>>(a1, a1 + 5)));
  }
  {
    int a2[] = {0, 2, 4, 5, 6, 8, 11};
    std::list<int, min_allocator<int>> c1;
    std::list<int, min_allocator<int>> c2(a2, a2 + 7);
    swap(c1, c2);
    assert((c1 == std::list<int, min_allocator<int>>(a2, a2 + 7)));
    assert(c2.empty());
    assert(std::distance(c2.begin(), c2.end()) == 0);
  }
  {
    int a1[] = {1, 3, 7, 9, 10};
    std::list<int, min_allocator<int>> c1(a1, a1 + 5);
    std::list<int, min_allocator<int>> c2;
    swap(c1, c2);
    assert(c1.empty());
    assert(std::distance(c1.begin(), c1.end()) == 0);
    assert((c2 == std::list<int, min_allocator<int>>(a1, a1 + 5)));
  }
  {
    std::list<int, min_allocator<int>> c1;
    std::list<int, min_allocator<int>> c2;
    swap(c1, c2);
    assert(c1.empty());
    assert(std::distance(c1.begin(), c1.end()) == 0);
    assert(c2.empty());
    assert(std::distance(c2.begin(), c2.end()) == 0);
  }
  {
    int a1[] = {1, 3, 7, 9, 10};
    int a2[] = {0, 2, 4, 5, 6, 8, 11};
    typedef min_allocator<int> A;
    std::list<int, A> c1(a1, a1 + 5, A());
    std::list<int, A> c2(a2, a2 + 7, A());
    swap(c1, c2);
    assert((c1 == std::list<int, A>(a2, a2 + 7)));
    assert(c1.get_allocator() == A());
    assert((c2 == std::list<int, A>(a1, a1 + 5)));
    assert(c2.get_allocator() == A());
  }
#endif

  return true;
}

int main(int, char**) {
  assert(test());
#if TEST_STD_VER >= 26
  static_assert(test());
#endif

  return 0;
}