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
18template <bool DefaultInitializable>
19struct 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
29static_assert( std::is_default_constructible_v<std::ranges::split_view<View<true >, View<true >>>);
30static_assert(!std::is_default_constructible_v<std::ranges::split_view<View<false>, View<true >>>);
31static_assert(!std::is_default_constructible_v<std::ranges::split_view<View<true >, View<false>>>);
32static_assert(!std::is_default_constructible_v<std::ranges::split_view<View<false>, View<false>>>);
33// clang-format on
34
35constexpr 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
43int main(int, char**) {
44 test();
45 static_assert(test());
46 return 0;
47}
48

source code of libcxx/test/std/ranges/range.adaptors/range.split/ctor.default.pass.cpp