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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14, c++17 10 // UNSUPPORTED: libcpp-no-concepts 11 // UNSUPPORTED: libcpp-has-no-incomplete-ranges 12 13 // constexpr V base() const& requires copy_constructible<V>; 14 // constexpr V base() &&; 15 16 #include <ranges> 17 #include <cassert> 18 19 #include "test_macros.h" 20 #include "test_iterators.h" 21 #include "types.h" 22 23 constexpr bool hasLValueQualifiedBase(auto&& view) { 24 return requires { view.base(); }; 25 } 26 27 constexpr bool test() { 28 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8}; 29 30 { 31 std::ranges::take_view<CopyableView> tv(CopyableView{buffer}, 0); 32 assert(tv.base().ptr_ == buffer); 33 assert(std::move(tv).base().ptr_ == buffer); 34 35 ASSERT_SAME_TYPE(decltype(tv.base()), CopyableView); 36 ASSERT_SAME_TYPE(decltype(std::move(tv).base()), CopyableView); 37 static_assert(hasLValueQualifiedBase(tv)); 38 } 39 40 { 41 std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 1); 42 assert(std::move(tv).base().ptr_ == buffer); 43 44 ASSERT_SAME_TYPE(decltype(std::move(tv).base()), MoveOnlyView); 45 static_assert(!hasLValueQualifiedBase(tv)); 46 } 47 48 { 49 const std::ranges::take_view<CopyableView> tv(CopyableView{buffer}, 2); 50 assert(tv.base().ptr_ == buffer); 51 assert(std::move(tv).base().ptr_ == buffer); 52 53 ASSERT_SAME_TYPE(decltype(tv.base()), CopyableView); 54 ASSERT_SAME_TYPE(decltype(std::move(tv).base()), CopyableView); 55 static_assert(hasLValueQualifiedBase(tv)); 56 } 57 58 return true; 59 } 60 61 int main(int, char**) { 62 test(); 63 static_assert(test()); 64 65 return 0; 66 } 67