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 // constexpr const iterator_t<Base>& inner-iterator::base() const& noexcept;
13 //
14 // constexpr iterator_t<Base> inner-iterator::base() &&
15 // requires forward_range<View>;
16
17 #include <ranges>
18
19 #include <concepts>
20 #include <utility>
21 #include "../types.h"
22
23 static_assert( noexcept(std::declval<InnerIterForward&>().base()));
24 static_assert( noexcept(std::declval<InnerIterForward const &>().base()));
25 static_assert( noexcept(std::declval<InnerIterForward const &&>().base()));
26 static_assert( noexcept(std::declval<InnerIterInput&>().base()));
27 static_assert( noexcept(std::declval<InnerIterInput const &>().base()));
28 static_assert( noexcept(std::declval<InnerIterInput const &&>().base()));
29
test()30 constexpr bool test() {
31 // `base` works with a forward view (two different overloads based on ref-qualification of the `inner-iterator`).
32 {
33 using BaseIter = std::ranges::iterator_t<CopyableView>;
34 CopyableView input("abc def");
35 std::ranges::lazy_split_view<CopyableView, ForwardView> v(input, " ");
36 auto i = (*v.begin()).begin();
37 const auto ci = i;
38
39 // Note: some macOS platforms seem to have trouble deducing the type when using `std::same_as` -- use the equivalent
40 // `ASSERT_SAME_TYPE` instead.
41 {
42 decltype(auto) b = i.base();
43 ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
44 assert(b == input.begin());
45 }
46
47 {
48 decltype(auto) b = ci.base();
49 ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
50 assert(b == input.begin());
51 }
52
53 {
54 decltype(auto) b = std::move(i).base();
55 ASSERT_SAME_TYPE(decltype(b), BaseIter);
56 assert(b == input.begin());
57 }
58
59 {
60 decltype(auto) b = std::move(ci).base();
61 ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
62 assert(b == input.begin());
63 }
64 }
65
66 // `base` works with an input view (no overloads).
67 {
68 using BaseIter = std::ranges::iterator_t<InputView>;
69 InputView input("abc def");
70 std::ranges::lazy_split_view<InputView, ForwardTinyView> v(input, ' ');
71 auto i = (*v.begin()).begin();
72 const auto ci = i;
73
74 {
75 decltype(auto) b = i.base();
76 ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
77 }
78
79 {
80 decltype(auto) b = ci.base();
81 ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
82 }
83
84 {
85 decltype(auto) b = std::move(i).base();
86 ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
87 }
88
89 {
90 decltype(auto) b = std::move(ci).base();
91 ASSERT_SAME_TYPE(decltype(b), const BaseIter&);
92 }
93 }
94
95 return true;
96 }
97
main(int,char **)98 int main(int, char**) {
99 test();
100 static_assert(test());
101
102 return 0;
103 }
104