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 // static constexpr size_t size() noexcept;
13 
14 #include <ranges>
15 #include <cassert>
16 
17 #include "test_macros.h"
18 
19 constexpr bool test() {
20   {
21     auto sv = std::ranges::single_view<int>(42);
22     assert(sv.size() == 1);
23 
24     ASSERT_SAME_TYPE(decltype(sv.size()), size_t);
25     static_assert(noexcept(sv.size()));
26   }
27   {
28     const auto sv = std::ranges::single_view<int>(42);
29     assert(sv.size() == 1);
30 
31     ASSERT_SAME_TYPE(decltype(sv.size()), size_t);
32     static_assert(noexcept(sv.size()));
33   }
34   {
35     auto sv = std::ranges::single_view<int>(42);
36     assert(std::ranges::size(sv) == 1);
37 
38     ASSERT_SAME_TYPE(decltype(std::ranges::size(sv)), size_t);
39     static_assert(noexcept(std::ranges::size(sv)));
40   }
41   {
42     const auto sv = std::ranges::single_view<int>(42);
43     assert(std::ranges::size(sv) == 1);
44 
45     ASSERT_SAME_TYPE(decltype(std::ranges::size(sv)), size_t);
46     static_assert(noexcept(std::ranges::size(sv)));
47   }
48 
49   // Test that it's static.
50   {
51     assert(std::ranges::single_view<int>::size() == 1);
52 
53     ASSERT_SAME_TYPE(decltype(std::ranges::single_view<int>::size()), size_t);
54     static_assert(noexcept(std::ranges::single_view<int>::size()));
55   }
56 
57   return true;
58 }
59 
60 int main(int, char**) {
61   test();
62   static_assert(test());
63 
64   return 0;
65 }
66