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 // constexpr outer-iterator::value-type outer-iterator::operator*() const;
13 
14 #include <ranges>
15 
16 #include <algorithm>
17 #include <cassert>
18 #include <string>
19 #include <string_view>
20 #include <type_traits>
21 #include "../types.h"
22 
23 template <class View, class Separator>
24 constexpr void test_one(Separator sep) {
25   using namespace std::string_literals;
26   using namespace std::string_view_literals;
27 
28   View v("abc def ghi"sv, sep);
29 
30   // Non-const iterator.
31   {
32     auto i = v.begin();
33     static_assert(!std::is_reference_v<decltype(*i)>);
34     assert(std::ranges::equal(*i, "abc"s));
35     assert(std::ranges::equal(*(++i), "def"s));
36     assert(std::ranges::equal(*(++i), "ghi"s));
37   }
38 
39   // Const iterator.
40   {
41     const auto ci = v.begin();
42     static_assert(!std::is_reference_v<decltype(*ci)>);
43     assert(std::ranges::equal(*ci, "abc"s));
44   }
45 }
46 
47 constexpr bool test() {
48   // `View` is a forward range.
49   test_one<SplitViewDiff>(" ");
50   test_one<SplitViewInput>(' ');
51 
52   return true;
53 }
54 
55 int main(int, char**) {
56   test();
57   static_assert(test());
58 
59   return 0;
60 }
61