xref: /llvm-project/libcxx/test/std/ranges/range.adaptors/range.lazy.split/ctor.default.pass.cpp (revision b8cb1dc9ea87faa8e8e9ab7a31710a8c0bb8b084)
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 //  lazy_split_view() requires default_initializable<V> && default_initializable<P> = default;
12 
13 #include <ranges>
14 
15 #include <cassert>
16 #include "types.h"
17 
18 struct ThrowingDefaultCtorForwardView : std::ranges::view_base {
19   ThrowingDefaultCtorForwardView() noexcept(false);
20   forward_iterator<int*> begin() const;
21   forward_iterator<int*> end() const;
22 };
23 
24 struct NoDefaultCtorForwardView : std::ranges::view_base {
25   NoDefaultCtorForwardView() = delete;
26   forward_iterator<int*> begin() const;
27   forward_iterator<int*> end() const;
28 };
29 
30 static_assert( std::is_default_constructible_v<std::ranges::lazy_split_view<ForwardView, ForwardView>>);
31 static_assert(!std::is_default_constructible_v<std::ranges::lazy_split_view<NoDefaultCtorForwardView, ForwardView>>);
32 static_assert(!std::is_default_constructible_v<std::ranges::lazy_split_view<ForwardView, NoDefaultCtorForwardView>>);
33 
34 static_assert( std::is_nothrow_default_constructible_v<std::ranges::lazy_split_view<ForwardView, ForwardView>>);
35 static_assert(!std::is_nothrow_default_constructible_v<ThrowingDefaultCtorForwardView>);
36 static_assert(!std::is_nothrow_default_constructible_v<
37     std::ranges::lazy_split_view<ThrowingDefaultCtorForwardView, ForwardView>>);
38 
test()39 constexpr bool test() {
40   {
41     std::ranges::lazy_split_view<CopyableView, ForwardView> v;
42     assert(v.base() == CopyableView());
43   }
44 
45   {
46     std::ranges::lazy_split_view<CopyableView, ForwardView> v = {};
47     assert(v.base() == CopyableView());
48   }
49 
50   return true;
51 }
52 
main(int,char **)53 int main(int, char**) {
54   test();
55   static_assert(test());
56 
57   return 0;
58 }
59