//===----------------------------------------------------------------------===//
//
// 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>

// void splice(const_iterator position, list<T,Allocator>& x, iterator i); // constexpr since C++26

#include <list>
#include <cassert>

#include "test_macros.h"
#include "min_allocator.h"

TEST_CONSTEXPR_CXX26 bool test() {
  int a1[] = {1, 2, 3};
  int a2[] = {4, 5, 6};
  {
    std::list<int> l1;
    std::list<int> l2(a2, a2 + 1);
    l1.splice(l1.end(), l2, l2.begin());
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 0);
    assert(std::distance(l2.begin(), l2.end()) == 0);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 4);
  }
  {
    std::list<int> l1;
    std::list<int> l2(a2, a2 + 2);
    l1.splice(l1.end(), l2, l2.begin());
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 1);
    assert(std::distance(l2.begin(), l2.end()) == 1);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 4);
    i = l2.begin();
    assert(*i == 5);
  }
  {
    std::list<int> l1;
    std::list<int> l2(a2, a2 + 2);
    l1.splice(l1.end(), l2, std::next(l2.begin()));
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 1);
    assert(std::distance(l2.begin(), l2.end()) == 1);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 5);
    i = l2.begin();
    assert(*i == 4);
  }
  {
    std::list<int> l1;
    std::list<int> l2(a2, a2 + 3);
    l1.splice(l1.end(), l2, l2.begin());
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 2);
    assert(std::distance(l2.begin(), l2.end()) == 2);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 4);
    i = l2.begin();
    assert(*i == 5);
    ++i;
    assert(*i == 6);
  }
  {
    std::list<int> l1;
    std::list<int> l2(a2, a2 + 3);
    l1.splice(l1.end(), l2, std::next(l2.begin()));
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 2);
    assert(std::distance(l2.begin(), l2.end()) == 2);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 5);
    i = l2.begin();
    assert(*i == 4);
    ++i;
    assert(*i == 6);
  }
  {
    std::list<int> l1;
    std::list<int> l2(a2, a2 + 3);
    l1.splice(l1.end(), l2, std::next(l2.begin(), 2));
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 2);
    assert(std::distance(l2.begin(), l2.end()) == 2);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 6);
    i = l2.begin();
    assert(*i == 4);
    ++i;
    assert(*i == 5);
  }
  {
    std::list<int> l1(a1, a1 + 1);
    l1.splice(l1.begin(), l1, l1.begin());
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 1);
  }
  {
    std::list<int> l1(a1, a1 + 1);
    std::list<int> l2(a2, a2 + 1);
    l1.splice(l1.begin(), l2, l2.begin());
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    assert(l2.size() == 0);
    assert(std::distance(l2.begin(), l2.end()) == 0);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 4);
    ++i;
    assert(*i == 1);
  }
  {
    std::list<int> l1(a1, a1 + 1);
    std::list<int> l2(a2, a2 + 1);
    l1.splice(std::next(l1.begin()), l2, l2.begin());
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    assert(l2.size() == 0);
    assert(std::distance(l2.begin(), l2.end()) == 0);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 1);
    ++i;
    assert(*i == 4);
  }
  {
    std::list<int> l1(a1, a1 + 2);
    l1.splice(l1.begin(), l1, l1.begin());
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 1);
    ++i;
    assert(*i == 2);
  }
  {
    std::list<int> l1(a1, a1 + 2);
    l1.splice(l1.begin(), l1, std::next(l1.begin()));
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 2);
    ++i;
    assert(*i == 1);
  }
  {
    std::list<int> l1(a1, a1 + 2);
    l1.splice(std::next(l1.begin()), l1, l1.begin());
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 1);
    ++i;
    assert(*i == 2);
  }
  {
    std::list<int> l1(a1, a1 + 2);
    l1.splice(std::next(l1.begin()), l1, std::next(l1.begin()));
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    std::list<int>::const_iterator i = l1.begin();
    assert(*i == 1);
    ++i;
    assert(*i == 2);
  }
#if TEST_STD_VER >= 11
  {
    std::list<int, min_allocator<int>> l1;
    std::list<int, min_allocator<int>> l2(a2, a2 + 1);
    l1.splice(l1.end(), l2, l2.begin());
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 0);
    assert(std::distance(l2.begin(), l2.end()) == 0);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 4);
  }
  {
    std::list<int, min_allocator<int>> l1;
    std::list<int, min_allocator<int>> l2(a2, a2 + 2);
    l1.splice(l1.end(), l2, l2.begin());
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 1);
    assert(std::distance(l2.begin(), l2.end()) == 1);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 4);
    i = l2.begin();
    assert(*i == 5);
  }
  {
    std::list<int, min_allocator<int>> l1;
    std::list<int, min_allocator<int>> l2(a2, a2 + 2);
    l1.splice(l1.end(), l2, std::next(l2.begin()));
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 1);
    assert(std::distance(l2.begin(), l2.end()) == 1);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 5);
    i = l2.begin();
    assert(*i == 4);
  }
  {
    std::list<int, min_allocator<int>> l1;
    std::list<int, min_allocator<int>> l2(a2, a2 + 3);
    l1.splice(l1.end(), l2, l2.begin());
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 2);
    assert(std::distance(l2.begin(), l2.end()) == 2);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 4);
    i = l2.begin();
    assert(*i == 5);
    ++i;
    assert(*i == 6);
  }
  {
    std::list<int, min_allocator<int>> l1;
    std::list<int, min_allocator<int>> l2(a2, a2 + 3);
    l1.splice(l1.end(), l2, std::next(l2.begin()));
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 2);
    assert(std::distance(l2.begin(), l2.end()) == 2);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 5);
    i = l2.begin();
    assert(*i == 4);
    ++i;
    assert(*i == 6);
  }
  {
    std::list<int, min_allocator<int>> l1;
    std::list<int, min_allocator<int>> l2(a2, a2 + 3);
    l1.splice(l1.end(), l2, std::next(l2.begin(), 2));
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    assert(l2.size() == 2);
    assert(std::distance(l2.begin(), l2.end()) == 2);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 6);
    i = l2.begin();
    assert(*i == 4);
    ++i;
    assert(*i == 5);
  }
  {
    std::list<int, min_allocator<int>> l1(a1, a1 + 1);
    l1.splice(l1.begin(), l1, l1.begin());
    assert(l1.size() == 1);
    assert(std::distance(l1.begin(), l1.end()) == 1);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 1);
  }
  {
    std::list<int, min_allocator<int>> l1(a1, a1 + 1);
    std::list<int, min_allocator<int>> l2(a2, a2 + 1);
    l1.splice(l1.begin(), l2, l2.begin());
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    assert(l2.size() == 0);
    assert(std::distance(l2.begin(), l2.end()) == 0);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 4);
    ++i;
    assert(*i == 1);
  }
  {
    std::list<int, min_allocator<int>> l1(a1, a1 + 1);
    std::list<int, min_allocator<int>> l2(a2, a2 + 1);
    l1.splice(std::next(l1.begin()), l2, l2.begin());
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    assert(l2.size() == 0);
    assert(std::distance(l2.begin(), l2.end()) == 0);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 1);
    ++i;
    assert(*i == 4);
  }
  {
    std::list<int, min_allocator<int>> l1(a1, a1 + 2);
    l1.splice(l1.begin(), l1, l1.begin());
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 1);
    ++i;
    assert(*i == 2);
  }
  {
    std::list<int, min_allocator<int>> l1(a1, a1 + 2);
    l1.splice(l1.begin(), l1, std::next(l1.begin()));
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 2);
    ++i;
    assert(*i == 1);
  }
  {
    std::list<int, min_allocator<int>> l1(a1, a1 + 2);
    l1.splice(std::next(l1.begin()), l1, l1.begin());
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 1);
    ++i;
    assert(*i == 2);
  }
  {
    std::list<int, min_allocator<int>> l1(a1, a1 + 2);
    l1.splice(std::next(l1.begin()), l1, std::next(l1.begin()));
    assert(l1.size() == 2);
    assert(std::distance(l1.begin(), l1.end()) == 2);
    std::list<int, min_allocator<int>>::const_iterator i = l1.begin();
    assert(*i == 1);
    ++i;
    assert(*i == 2);
  }
#endif

  return true;
}

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

  return 0;
}
