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 // Test that iota_view conforms to range and view concepts.
12 
13 #include <ranges>
14 
15 #include "types.h"
16 
17 struct Decrementable {
18   using difference_type = int;
19 
20   auto operator<=>(const Decrementable&) const = default;
21 
22   Decrementable& operator++();
23   Decrementable  operator++(int);
24   Decrementable& operator--();
25   Decrementable  operator--(int);
26 };
27 
28 struct Incrementable {
29   using difference_type = int;
30 
31   auto operator<=>(const Incrementable&) const = default;
32 
33   Incrementable& operator++();
34   Incrementable  operator++(int);
35 };
36 
37 static_assert(std::ranges::random_access_range<std::ranges::iota_view<int>>);
38 static_assert(std::ranges::random_access_range<const std::ranges::iota_view<int>>);
39 static_assert(std::ranges::bidirectional_range<std::ranges::iota_view<Decrementable>>);
40 static_assert(std::ranges::forward_range<std::ranges::iota_view<Incrementable>>);
41 static_assert(std::ranges::input_range<std::ranges::iota_view<NotIncrementable>>);
42 static_assert(std::ranges::view<std::ranges::iota_view<int>>);
43