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
11// std::views::zip
12
13#include <ranges>
14
15#include <array>
16#include <cassert>
17#include <tuple>
18#include <type_traits>
19#include <utility>
20
21#include "types.h"
22
23static_assert(std::is_invocable_v<decltype((std::views::zip))>);
24static_assert(!std::is_invocable_v<decltype((std::views::zip)), int>);
25static_assert(std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView>);
26static_assert(
27 std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView, std::ranges::iota_view<int, int>>);
28static_assert(!std::is_invocable_v<decltype((std::views::zip)), SizedRandomAccessView, int>);
29
30constexpr bool test() {
31 {
32 // zip zero arguments
33 auto v = std::views::zip();
34 assert(std::ranges::empty(v));
35 static_assert(std::is_same_v<decltype(v), std::ranges::empty_view<std::tuple<>>>);
36 }
37
38 {
39 // zip a view
40 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
41 std::same_as<std::ranges::zip_view<SizedRandomAccessView>> decltype(auto) v =
42 std::views::zip(SizedRandomAccessView{buffer});
43 assert(std::ranges::size(v) == 8);
44 static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v)>, std::tuple<int&>>);
45 }
46
47 {
48 // zip a viewable range
49 std::array a{1, 2, 3};
50 std::same_as<std::ranges::zip_view<std::ranges::ref_view<std::array<int, 3>>>> decltype(auto) v =
51 std::views::zip(a);
52 assert(&(std::get<0>(*v.begin())) == &(a[0]));
53 static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v)>, std::tuple<int&>>);
54 }
55
56 {
57 // zip the zip_view
58 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
59 std::same_as<std::ranges::zip_view<SizedRandomAccessView, SizedRandomAccessView>> decltype(auto) v =
60 std::views::zip(SizedRandomAccessView{buffer}, SizedRandomAccessView{buffer});
61
62 std::same_as<
63 std::ranges::zip_view<std::ranges::zip_view<SizedRandomAccessView, SizedRandomAccessView>>> decltype(auto) v2 =
64 std::views::zip(v);
65
66 static_assert(std::is_same_v<std::ranges::range_reference_t<decltype(v2)>, std::tuple<std::tuple<int&, int&>>>);
67 }
68 return true;
69}
70
71int main(int, char**) {
72 test();
73 static_assert(test());
74
75 return 0;
76}
77

source code of libcxx/test/std/ranges/range.adaptors/range.zip/cpo.pass.cpp