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 // Some basic examples of how zip_view might be used in the wild. This is a general
13 // collection of sample algorithms and functions that try to mock general usage of
14 // this view.
15 
16 #include <ranges>
17 
18 #include <array>
19 #include <cassert>
20 #include <vector>
21 #include <string>
22 
23 int main(int, char**) {
24   {
25     std::ranges::zip_view v{
26         std::array{1, 2},
27         std::vector{4, 5, 6},
28         std::array{7},
29     };
30     assert(std::ranges::size(v) == 1);
31     assert(*v.begin() == std::make_tuple(1, 4, 7));
32   }
33   {
34     using namespace std::string_literals;
35     std::vector v{1, 2, 3, 4};
36     std::array a{"abc"s, "def"s, "gh"s};
37     auto view = std::views::zip(v, a);
38     auto it = view.begin();
39     assert(&(std::get<0>(*it)) == &(v[0]));
40     assert(&(std::get<1>(*it)) == &(a[0]));
41 
42     ++it;
43     assert(&(std::get<0>(*it)) == &(v[1]));
44     assert(&(std::get<1>(*it)) == &(a[1]));
45 
46     ++it;
47     assert(&(std::get<0>(*it)) == &(v[2]));
48     assert(&(std::get<1>(*it)) == &(a[2]));
49 
50     ++it;
51     assert(it == view.end());
52   }
53 
54   return 0;
55 }
56