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 // Test that iota_view conforms to range and view concepts.
13 
14 #include <ranges>
15 
16 #include "types.h"
17 
18 struct Decrementable {
19   using difference_type = int;
20 
21   auto operator<=>(const Decrementable&) const = default;
22 
23   Decrementable& operator++();
24   Decrementable  operator++(int);
25   Decrementable& operator--();
26   Decrementable  operator--(int);
27 };
28 
29 struct Incrementable {
30   using difference_type = int;
31 
32   auto operator<=>(const Incrementable&) const = default;
33 
34   Incrementable& operator++();
35   Incrementable  operator++(int);
36 };
37 
38 static_assert(std::ranges::random_access_range<std::ranges::iota_view<int>>);
39 static_assert(std::ranges::random_access_range<const std::ranges::iota_view<int>>);
40 static_assert(std::ranges::bidirectional_range<std::ranges::iota_view<Decrementable>>);
41 static_assert(std::ranges::forward_range<std::ranges::iota_view<Incrementable>>);
42 static_assert(std::ranges::input_range<std::ranges::iota_view<NotIncrementable>>);
43 static_assert(std::ranges::view<std::ranges::iota_view<int>>);
44