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1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11// constexpr V base() const& requires copy_constructible<V>;12// constexpr V base() &&;13 14#include <ranges>15#include <cassert>16 17#include "test_macros.h"18#include "test_iterators.h"19#include "types.h"20 21constexpr bool hasLValueQualifiedBase(auto&& view) {22    return requires { view.base(); };23}24 25constexpr bool test() {26  int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};27 28  {29    std::ranges::take_view<CopyableView> tv(CopyableView{buffer}, 0);30    assert(tv.base().ptr_ == buffer);31    assert(std::move(tv).base().ptr_ == buffer);32 33    ASSERT_SAME_TYPE(decltype(tv.base()), CopyableView);34    ASSERT_SAME_TYPE(decltype(std::move(tv).base()), CopyableView);35    static_assert(hasLValueQualifiedBase(tv));36  }37 38  {39    std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 1);40    assert(std::move(tv).base().ptr_ == buffer);41 42    ASSERT_SAME_TYPE(decltype(std::move(tv).base()), MoveOnlyView);43    static_assert(!hasLValueQualifiedBase(tv));44  }45 46  {47    const std::ranges::take_view<CopyableView> tv(CopyableView{buffer}, 2);48    assert(tv.base().ptr_ == buffer);49    assert(std::move(tv).base().ptr_ == buffer);50 51    ASSERT_SAME_TYPE(decltype(tv.base()), CopyableView);52    ASSERT_SAME_TYPE(decltype(std::move(tv).base()), CopyableView);53    static_assert(hasLValueQualifiedBase(tv));54  }55 56  return true;57}58 59int main(int, char**) {60  test();61  static_assert(test());62 63  return 0;64}65