libcxx/test/std/containers/container.adaptors/flat.set/flat.set.cons/copy_alloc.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20

// <flat_set>

// flat_set(const flat_set&, const allocator_type&);

#include <algorithm>
#include <cassert>
#include <deque>
#include <flat_set>
#include <functional>
#include <vector>

#include "test_macros.h"
#include "../../../test_compare.h"
#include "test_allocator.h"

template <template <class...> class KeyContainer>
constexpr void test() {
  using C = test_less<int>;
  KeyContainer<int, test_allocator<int>> ks({1, 3, 5}, test_allocator<int>(6));
  using M = std::flat_set<int, C, decltype(ks)>;
  auto mo = M(ks, C(5));
  auto m  = M(mo, test_allocator<int>(3));

  assert(m.key_comp() == C(5));
  assert(std::ranges::equal(m, ks));
  auto keys = std::move(m).extract();
  assert(keys.get_allocator() == test_allocator<int>(3));

  // mo is unchanged
  assert(mo.key_comp() == C(5));
  assert(std::ranges::equal(mo, ks));
  auto keys2 = std::move(mo).extract();
  assert(keys2.get_allocator() == test_allocator<int>(6));
}

constexpr bool test() {
  {
    // The constructors in this subclause shall not participate in overload
    // resolution unless uses_allocator_v<container_type, Alloc> is true.

    using C  = test_less<int>;
    using A1 = test_allocator<int>;
    using A2 = other_allocator<int>;
    using V1 = std::vector<int, A1>;
    using V2 = std::vector<int, A2>;
    using M1 = std::flat_set<int, C, V1>;
    using M2 = std::flat_set<int, C, V2>;
    static_assert(std::is_constructible_v<M1, const M1&, const A1&>);
    static_assert(std::is_constructible_v<M2, const M2&, const A2&>);
    static_assert(!std::is_constructible_v<M1, const M1&, const A2&>);
    static_assert(!std::is_constructible_v<M2, const M2&, const A1&>);
  }

  test<std::vector>();
#ifndef __cpp_lib_constexpr_deque
  if (!TEST_IS_CONSTANT_EVALUATED)
#endif
    test<std::deque>();

  return true;
}

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

  return 0;
}