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-no-concepts
11 // UNSUPPORTED: gcc-10
12 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
13 
14 // class std::ranges::subrange;
15 
16 #include <ranges>
17 
18 #include <cassert>
19 #include "test_macros.h"
20 #include "test_iterators.h"
21 
22 using FI = forward_iterator<int*>;
23 FI fi{nullptr};
24 int *ptr = nullptr;
25 
26 static_assert(std::same_as<decltype(std::ranges::subrange(fi, fi)),
27                            std::ranges::subrange<FI, FI, std::ranges::subrange_kind::unsized>>);
28 static_assert(std::same_as<decltype(std::ranges::subrange(ptr, ptr, 0)),
29                            std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);
30 static_assert(std::same_as<decltype(std::ranges::subrange(ptr, nullptr, 0)),
31                            std::ranges::subrange<int*, nullptr_t, std::ranges::subrange_kind::sized>>);
32 
33 struct ForwardRange {
34   forward_iterator<int*> begin() const;
35   forward_iterator<int*> end() const;
36 };
37 template<>
38 inline constexpr bool std::ranges::enable_borrowed_range<ForwardRange> = true;
39 
40 struct SizedRange {
41   int *begin();
42   int *end();
43 };
44 template<>
45 inline constexpr bool std::ranges::enable_borrowed_range<SizedRange> = true;
46 
47 static_assert(std::same_as<decltype(std::ranges::subrange(ForwardRange())),
48                            std::ranges::subrange<FI, FI, std::ranges::subrange_kind::unsized>>);
49 static_assert(std::same_as<decltype(std::ranges::subrange(SizedRange())),
50                            std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);
51 static_assert(std::same_as<decltype(std::ranges::subrange(SizedRange(), 8)),
52                            std::ranges::subrange<int*, int*, std::ranges::subrange_kind::sized>>);
53