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 
11 // iterator() = default;
12 
13 #include <ranges>
14 
15 #include <cassert>
16 #include <type_traits>
17 #include "test_iterators.h"
18 #include "../types.h"
19 
20 template <class It>
21 struct view : std::ranges::view_base {
22   It begin() const;
23   sentinel_wrapper<It> end() const;
24 };
25 
26 template <class It>
test_default_constructible()27 constexpr void test_default_constructible() {
28   using JoinView = std::ranges::join_view<view<It>>;
29   using JoinIterator = std::ranges::iterator_t<JoinView>;
30   static_assert(std::is_default_constructible_v<JoinIterator>);
31   [[maybe_unused]] JoinIterator it;
32 }
33 
test()34 constexpr bool test() {
35   test_default_constructible<cpp17_input_iterator<ChildView*>>();
36   test_default_constructible<cpp20_input_iterator<ChildView*>>();
37   test_default_constructible<forward_iterator<ChildView*>>();
38   test_default_constructible<bidirectional_iterator<ChildView*>>();
39   test_default_constructible<random_access_iterator<ChildView*>>();
40   test_default_constructible<contiguous_iterator<ChildView*>>();
41   return true;
42 }
43 
main(int,char **)44 int main(int, char**) {
45   test();
46   static_assert(test());
47   return 0;
48 }
49