libcxx/test/std/containers/container.adaptors/flat.map/flat.map.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_map>

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

#include <cassert>
#include <deque>
#include <flat_map>
#include <functional>
#include <vector>

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

template <template <class...> class KeyContainer, template <class...> class ValueContainer>
constexpr void test() {
  using C = test_less<int>;
  KeyContainer<int, test_allocator<int>> ks({1, 3, 5}, test_allocator<int>(6));
  ValueContainer<char, test_allocator<char>> vs({2, 2, 1}, test_allocator<char>(7));
  using M = std::flat_map<int, char, C, decltype(ks), decltype(vs)>;
  auto mo = M(ks, vs, C(5));
  auto m  = M(mo, test_allocator<int>(3));

  assert(m.key_comp() == C(5));
  assert(m.keys() == ks);
  assert(m.values() == vs);
  assert(m.keys().get_allocator() == test_allocator<int>(3));
  assert(m.values().get_allocator() == test_allocator<char>(3));

  // mo is unchanged
  assert(mo.key_comp() == C(5));
  assert(mo.keys() == ks);
  assert(mo.values() == vs);
  assert(mo.keys().get_allocator() == test_allocator<int>(6));
  assert(mo.values().get_allocator() == test_allocator<char>(7));
}

constexpr bool test() {
  {
    // The constructors in this subclause shall not participate in overload
    // resolution unless uses_allocator_v<key_container_type, Alloc> is true
    // and uses_allocator_v<mapped_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_map<int, int, C, V1, V1>;
    using M2 = std::flat_map<int, int, C, V1, V2>;
    using M3 = std::flat_map<int, int, C, V2, V1>;
    static_assert(std::is_constructible_v<M1, const M1&, const A1&>);
    static_assert(!std::is_constructible_v<M1, const M1&, const A2&>);
    static_assert(!std::is_constructible_v<M2, const M2&, const A2&>);
    static_assert(!std::is_constructible_v<M3, const M3&, const A2&>);
  }

  test<std::vector, std::vector>();

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

  return true;
}

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

  return 0;
}