65 lines · cpp
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