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, c++20
10 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11
12 // std::views::zip
13
14 #include <ranges>
15
16 #include <array>
17 #include <cassert>
18 #include <tuple>
19 #include <type_traits>
20 #include <utility>
21
22 #include "types.h"
23
24 static_assert(std::is_invocable_v<decltype((std::views::zip))>);
25 static_assert(!std::is_invocable_v<decltype((std::views::zip)), int>);
26 static_assert(std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView>);
27 static_assert(
28 std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView, std::ranges::iota_view<int, int>>);
29 static_assert(!std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView, int>);
30
test()31 constexpr bool test() {
32 {
33 // zip zero arguments
34 auto v = std::views::zip();
35 assert(std::ranges::empty(v));
36 static_assert(std::is_same_v<decltype(v), std::ranges::empty_view<std::tuple<>>>);
37 }
38
39 {
40 // zip a view
41 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
42 std::same_as<std::ranges::zip_view<SizedRandomAccessView>> decltype(auto) v =
43 std::views::zip(SizedRandomAccessView{buffer});
44 assert(std::ranges::size(v) == 8);
45 static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v)>, std::tuple<int&>>);
46 }
47
48 {
49 // zip a viewable range
50 std::array a{1, 2, 3};
51 std::same_as<std::ranges::zip_view<std::ranges::ref_view<std::array<int, 3>>>> decltype(auto) v =
52 std::views::zip(a);
53 assert(&(std::get<0>(*v.begin())) == &(a[0]));
54 static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v)>, std::tuple<int&>>);
55 }
56
57 {
58 // zip the zip_view
59 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
60 std::same_as<std::ranges::zip_view<SizedRandomAccessView, SizedRandomAccessView>> decltype(auto) v =
61 std::views::zip(SizedRandomAccessView{buffer}, SizedRandomAccessView{buffer});
62
63 std::same_as<
64 std::ranges::zip_view<std::ranges::zip_view<SizedRandomAccessView, SizedRandomAccessView>>> decltype(auto) v2 =
65 std::views::zip(v);
66
67 static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v2)>, std::tuple<std::pair<int&, int&>>>);
68 }
69 return true;
70 }
71
main(int,char **)72 int main(int, char**) {
73 test();
74 static_assert(test());
75
76 return 0;
77 }
78