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 // template <class _Tp>
13 // inline constexpr empty_view<_Tp> empty{};
14 
15 #include <ranges>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
20 template <class T>
testType()21 constexpr void testType() {
22   ASSERT_SAME_TYPE(decltype(std::views::empty<T>), const std::ranges::empty_view<T>);
23   ASSERT_SAME_TYPE(decltype((std::views::empty<T>)), const std::ranges::empty_view<T>&);
24 
25   auto v = std::views::empty<T>;
26   assert(std::ranges::empty(v));
27 }
28 
29 struct Empty {};
30 struct BigType {
31   char buff[8];
32 };
33 
test()34 constexpr bool test() {
35 
36   testType<int>();
37   testType<const int>();
38   testType<int*>();
39   testType<Empty>();
40   testType<const Empty>();
41   testType<BigType>();
42 
43   return true;
44 }
45 
main(int,char **)46 int main(int, char**) {
47   test();
48   static_assert(test());
49 
50   return 0;
51 }
52