61 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 <cassert>15#include <ranges>16 17#include "test_macros.h"18#include "types.h"19 20constexpr bool hasLValueQualifiedBase(auto&& view) {21 return requires { view.base(); };22}23 24constexpr bool test() {25 int buffer[4][4] = {{1111, 2222, 3333, 4444}, {555, 666, 777, 888}, {99, 1010, 1111, 1212}, {13, 14, 15, 16}};26 27 {28 ChildView children[4] = {ChildView(buffer[0]), ChildView(buffer[1]), ChildView(buffer[2]), ChildView(buffer[3])};29 auto jv = std::ranges::join_view(ParentView{children});30 assert(std::move(jv).base().ptr_ == children);31 32 static_assert(!hasLValueQualifiedBase(jv));33 ASSERT_SAME_TYPE(decltype(std::move(jv).base()), ParentView<ChildView>);34 }35 36 {37 std::ranges::join_view jv(buffer);38 assert(jv.base().base() == buffer + 0);39 40 static_assert(hasLValueQualifiedBase(jv));41 ASSERT_SAME_TYPE(decltype(jv.base()), std::ranges::ref_view<int [4][4]>);42 }43 44 {45 const std::ranges::join_view jv(buffer);46 assert(jv.base().base() == buffer + 0);47 48 static_assert(hasLValueQualifiedBase(jv));49 ASSERT_SAME_TYPE(decltype(jv.base()), std::ranges::ref_view<int [4][4]>);50 }51 52 return true;53}54 55int main(int, char**) {56 test();57 static_assert(test());58 59 return 0;60}61