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 // constexpr split_view() requires
12 // default_initializable<V> && default_initializable<Pattern> = default;
13
14 #include <cassert>
15 #include <ranges>
16 #include <type_traits>
17
18 template <bool DefaultInitializable>
19 struct View : std::ranges::view_base {
20 int i = 42;
21 constexpr explicit View()
22 requires DefaultInitializable
23 = default;
24 int* begin() const;
25 int* end() const;
26 };
27
28 // clang-format off
29 static_assert( std::is_default_constructible_v<std::ranges::split_view<View<true >, View<true >>>);
30 static_assert(!std::is_default_constructible_v<std::ranges::split_view<View<false>, View<true >>>);
31 static_assert(!std::is_default_constructible_v<std::ranges::split_view<View<true >, View<false>>>);
32 static_assert(!std::is_default_constructible_v<std::ranges::split_view<View<false>, View<false>>>);
33 // clang-format on
34
test()35 constexpr bool test() {
36 {
37 std::ranges::split_view<View<true>, View<true>> sv = {};
38 assert(sv.base().i == 42);
39 }
40 return true;
41 }
42
main(int,char **)43 int main(int, char**) {
44 test();
45 static_assert(test());
46 return 0;
47 }
48