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-has-no-incomplete-ranges
11 
12 // single_view() requires default_initializable<T> = default;
13 
14 #include <ranges>
15 #include <cassert>
16 
17 #include "test_macros.h"
18 
19 struct BigType { char buffer[64] = {10}; };
20 
21 template<bool DefaultCtorEnabled>
22 struct IsDefaultConstructible {
23   IsDefaultConstructible() requires DefaultCtorEnabled = default;
24 };
25 
test()26 constexpr bool test() {
27   static_assert( std::default_initializable<std::ranges::single_view<IsDefaultConstructible<true>>>);
28   static_assert(!std::default_initializable<std::ranges::single_view<IsDefaultConstructible<false>>>);
29 
30   {
31     std::ranges::single_view<BigType> sv;
32     assert(sv.data()->buffer[0] == 10);
33     assert(sv.size() == 1);
34   }
35   {
36     const std::ranges::single_view<BigType> sv;
37     assert(sv.data()->buffer[0] == 10);
38     assert(sv.size() == 1);
39   }
40 
41   return true;
42 }
43 
main(int,char **)44 int main(int, char**) {
45   test();
46   static_assert(test());
47 
48   return 0;
49 }
50