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> { return base_; }
14 // constexpr V base() && { return std::move(base_); }
15 
16 #include <ranges>
17 
18 #include "test_macros.h"
19 #include "types.h"
20 
21 constexpr bool test() {
22   std::ranges::drop_view<MoveOnlyView> dropView1;
23   auto base1 = std::move(dropView1).base();
24   assert(std::ranges::begin(base1) == globalBuff);
25 
26   // Note: we should *not* drop two elements here.
27   std::ranges::drop_view<MoveOnlyView> dropView2(MoveOnlyView{4}, 2);
28   auto base2 = std::move(dropView2).base();
29   assert(std::ranges::begin(base2) == globalBuff + 4);
30 
31   std::ranges::drop_view<CopyableView> dropView3;
32   auto base3 = dropView3.base();
33   assert(std::ranges::begin(base3) == globalBuff);
34   auto base4 = std::move(dropView3).base();
35   assert(std::ranges::begin(base4) == globalBuff);
36 
37   return true;
38 }
39 
40 int main(int, char**) {
41   test();
42   static_assert(test());
43 
44   return 0;
45 }
46